linux-2.6-microblaze.git
13 months agoDocs/admin-guide/mm/damon/usage: link design doc for details of kdamond and context
SeongJae Park [Thu, 7 Sep 2023 02:29:25 +0000 (02:29 +0000)]
Docs/admin-guide/mm/damon/usage: link design doc for details of kdamond and context

The explanation of kdamond and context is duplicated in the design and
the usage documents.  Replace that in the usage with links to those in
the design document.

Link: https://lkml.kernel.org/r/20230907022929.91361-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoDocs/mm/damon/design: add a section for kdamond and DAMON context
SeongJae Park [Thu, 7 Sep 2023 02:29:24 +0000 (02:29 +0000)]
Docs/mm/damon/design: add a section for kdamond and DAMON context

The design document is not explaining about the concept of kdamond and
the DAMON context, while usage document does.  Those concept explanation
should be in the design document, and usage document should link those.
Add a section for those.

Link: https://lkml.kernel.org/r/20230907022929.91361-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoDocs/admin-guide/mm/damon/usage: explain the format of damon_aggregate tracepoint
SeongJae Park [Thu, 7 Sep 2023 02:29:23 +0000 (02:29 +0000)]
Docs/admin-guide/mm/damon/usage: explain the format of damon_aggregate tracepoint

The example of the section for damon_aggregated tracepoint is not
explaining how the output looks like, and how it can be interpreted.
Add it.

Link: https://lkml.kernel.org/r/20230907022929.91361-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoDocs/mm/damon/design: explicitly introduce ``nr_accesses``
SeongJae Park [Thu, 7 Sep 2023 02:29:22 +0000 (02:29 +0000)]
Docs/mm/damon/design: explicitly introduce ``nr_accesses``

The design document is explaining about the access tracking mechanism
and the access rate counter (nr_accesses), but not directly mentions the
name.  Add a sentence for making it clear.

Link: https://lkml.kernel.org/r/20230907022929.91361-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoDocs/admin-guide/mm/damon/usage: move debugfs intro to the bottom of the section
SeongJae Park [Thu, 7 Sep 2023 02:29:21 +0000 (02:29 +0000)]
Docs/admin-guide/mm/damon/usage: move debugfs intro to the bottom of the section

On the DAMON usage introduction section, the introduction of DAMON
debugfs interface, which is deprecated, is above kernel API, which is
actively supported.  Move the DAMON debugfs intro to bottom, so that
readers have less chances to read it.

Link: https://lkml.kernel.org/r/20230907022929.91361-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoDocs/admin-guide/mm/damon/usage: place debugfs usage at the bottom
SeongJae Park [Thu, 7 Sep 2023 02:29:20 +0000 (02:29 +0000)]
Docs/admin-guide/mm/damon/usage: place debugfs usage at the bottom

debugfs interface is deprecated.  Put it at the bottom of the document
so that readers have less chances to read it.

Link: https://lkml.kernel.org/r/20230907022929.91361-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoDocs/admin-guide/mm/damon/usage: fixup missed :ref: keyword
SeongJae Park [Thu, 7 Sep 2023 02:29:19 +0000 (02:29 +0000)]
Docs/admin-guide/mm/damon/usage: fixup missed :ref: keyword

Patch series "mm/damon: misc fixups for documents, comments and its
tracepoint".

This patchset contains miscellaneous simple fixups for documents, comments and
tracepoint of DAMON.

This patch (of 11):

A cross-link reference in DAMON usage document is missing ':ref:' Sphynx
keyword.  Fix it.

Link: https://lkml.kernel.org/r/20230907022929.91361-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20230907022929.91361-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agozswap: change zswap's default allocator to zsmalloc
Nhat Pham [Fri, 8 Sep 2023 23:51:15 +0000 (16:51 -0700)]
zswap: change zswap's default allocator to zsmalloc

Out of zswap's 3 allocators, zsmalloc is the clear superior in terms of
memory utilization, both in theory and as observed in practice, with its
high storage density and low internal fragmentation.  zsmalloc is also
more actively developed and maintained, since it is the allocator of
choice for zswap for many users, as well as the only allocator for zram.

A historical objection to the selection of zsmalloc as the default
allocator for zswap is its lack of writeback capability.  However, this
has changed, with the zsmalloc writeback patchset, and the subsequent
zswap LRU refactor.  With this, there is not a lot of good reasons to keep
zbud, an otherwise inferior allocator, as the default instead of zswap.

This patch changes the default allocator to zsmalloc.  The only exception
is on settings without MMU, in which case zbud will remain as the default.

Link: https://lkml.kernel.org/r/20230908235115.2943486-1-nphamcs@gmail.com
Signed-off-by: Nhat Pham <nphamcs@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Yosry Ahmed <yosryahmed@google.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests: mm: add a test for moving from an offset from start of mapping
Joel Fernandes [Sun, 3 Sep 2023 15:13:28 +0000 (15:13 +0000)]
selftests: mm: add a test for moving from an offset from start of mapping

It is possible that the aligned address falls on no existing mapping,
however that does not mean that we can just align it down to that.  This
test verifies that the "vma->vm_start != addr_to_align" check in
can_align_down() prevents disastrous results if aligning down when source
and dest are mutually aligned within a PMD but the source/dest addresses
requested are not at the beginning of the respective mapping containing
these addresses.

Link: https://lkml.kernel.org/r/20230903151328.2981432-8-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests: mm: add a test for remapping within a range
Joel Fernandes (Google) [Sun, 3 Sep 2023 15:13:27 +0000 (15:13 +0000)]
selftests: mm: add a test for remapping within a range

Move a block of memory within a memory range.  Any alignment optimization
on the source address may cause corruption.  Verify using kselftest that
it works.  I have also verified with tracing that such optimization does
not happen due to this check in can_align_down():

if (!for_stack && vma->vm_start != addr_to_align)
return false;

Link: https://lkml.kernel.org/r/20230903151328.2981432-7-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests: mm: add a test for remapping to area immediately after existing mapping
Joel Fernandes (Google) [Sun, 3 Sep 2023 15:13:26 +0000 (15:13 +0000)]
selftests: mm: add a test for remapping to area immediately after existing mapping

This patch adds support for verifying that we correctly handle the
situation where something is already mapped before the destination of the remap.

Any realignment of destination address and PMD-copy will destroy that
existing mapping. In such cases, we need to avoid doing the optimization.

To test this, we map an area called the preamble before the remap
region. Then we verify after the mremap operation that this region did not get
corrupted.

Putting some prints in the kernel, I verified that we optimize
correctly in different situations:

Optimize when there is alignment and no previous mapping (this is tested
by previous patch).
<prints>
can_align_down(old_vma->vm_start=2900000, old_addr=2900000, mask=-2097152): 0
can_align_down(new_vma->vm_start=2f00000, new_addr=2f00000, mask=-2097152): 0
=== Starting move_page_tables ===
Doing PUD move for 2800000 -> 2e00000 of extent=200000 <-- Optimization
Doing PUD move for 2a00000 -> 3000000 of extent=200000
Doing PUD move for 2c00000 -> 3200000 of extent=200000
</prints>

Don't optimize when there is alignment but there is previous mapping
(this is tested by this patch).
Notice that can_align_down() returns 1 for the destination mapping
as we detected there is something there.
<prints>
can_align_down(old_vma->vm_start=2900000, old_addr=2900000, mask=-2097152): 0
can_align_down(new_vma->vm_start=5700000, new_addr=5700000, mask=-2097152): 1
=== Starting move_page_tables ===
Doing move_ptes for 2900000 -> 5700000 of extent=100000 <-- Unoptimized
Doing PUD move for 2a00000 -> 5800000 of extent=200000
Doing PUD move for 2c00000 -> 5a00000 of extent=200000
</prints>

Link: https://lkml.kernel.org/r/20230903151328.2981432-6-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests: mm: add a test for mutually aligned moves > PMD size
Joel Fernandes (Google) [Sun, 3 Sep 2023 15:13:25 +0000 (15:13 +0000)]
selftests: mm: add a test for mutually aligned moves > PMD size

This patch adds a test case to check if a PMD-alignment optimization
successfully happens.

I add support to make sure there is some room before the source mapping,
otherwise the optimization to trigger PMD-aligned move will be disabled as
the kernel will detect that a mapping before the source exists and such
optimization becomes impossible.

Link: https://lkml.kernel.org/r/20230903151328.2981432-5-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests: mm: fix failure case when new remap region was not found
Joel Fernandes (Google) [Sun, 3 Sep 2023 15:13:24 +0000 (15:13 +0000)]
selftests: mm: fix failure case when new remap region was not found

When a valid remap region could not be found, the source mapping is not
cleaned up.  Fix the goto statement such that the clean up happens.

Link: https://lkml.kernel.org/r/20230903151328.2981432-4-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/mremap: allow moves within the same VMA for stack moves
Joel Fernandes (Google) [Sun, 3 Sep 2023 15:13:23 +0000 (15:13 +0000)]
mm/mremap: allow moves within the same VMA for stack moves

For the stack move happening in shift_arg_pages(), the move is happening
within the same VMA which spans the old and new ranges.

In case the aligned address happens to fall within that VMA, allow such
moves and don't abort the mremap alignment optimization.

In the regular non-stack mremap case, we cannot allow any such moves as
will end up destroying some part of the mapping (either the source of the
move, or part of the existing mapping).  So just avoid it for stack moves.

Link: https://lkml.kernel.org/r/20230903151328.2981432-3-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/mremap: optimize the start addresses in move_page_tables()
Joel Fernandes (Google) [Sun, 3 Sep 2023 15:13:22 +0000 (15:13 +0000)]
mm/mremap: optimize the start addresses in move_page_tables()

Patch series "Optimize mremap during mutual alignment within PMD", v6.

This patchset optimizes the start addresses in move_page_tables() and
tests the changes.  It addresses a warning [1] that occurs due to a
downward, overlapping move on a mutually-aligned offset within a PMD
during exec.  By initiating the copy process at the PMD level when such
alignment is present, we can prevent this warning and speed up the copying
process at the same time.  Linus Torvalds suggested this idea.  Check the
individual patches for more details.  [1]
https://lore.kernel.org/all/ZB2GTBD%2FLWTrkOiO@dhcp22.suse.cz/

This patch (of 7):

Recently, we see reports [1] of a warning that triggers due to
move_page_tables() doing a downward and overlapping move on a
mutually-aligned offset within a PMD.  By mutual alignment, I mean the
source and destination addresses of the mremap are at the same offset
within a PMD.

This mutual alignment along with the fact that the move is downward is
sufficient to cause a warning related to having an allocated PMD that does
not have PTEs in it.

This warning will only trigger when there is mutual alignment in the move
operation.  A solution, as suggested by Linus Torvalds [2], is to initiate
the copy process at the PMD level whenever such alignment is present.
Implementing this approach will not only prevent the warning from being
triggered, but it will also optimize the operation as this method should
enhance the speed of the copy process whenever there's a possibility to
start copying at the PMD level.

Some more points:
a. The optimization can be done only when both the source and
destination of the mremap do not have anything mapped below it up to a
PMD boundary. I add support to detect that.

b. #1 is not a problem for the call to move_page_tables() from exec.c as
nothing is expected to be mapped below the source. However, for
non-overlapping mutually aligned moves as triggered by mremap(2), I
added support for checking such cases.

c. I currently only optimize for PMD moves, in the future I/we can build
on this work and do PUD moves as well if there is a need for this. But I
want to take it one step at a time.

d. We need to be careful about mremap of ranges within the VMA itself.
For this purpose, I added checks to determine if the address after
alignment falls within its VMA itself.

[1] https://lore.kernel.org/all/ZB2GTBD%2FLWTrkOiO@dhcp22.suse.cz/
[2] https://lore.kernel.org/all/CAHk-=whd7msp8reJPfeGNyt0LiySMT0egExx3TVZSX3Ok6X=9g@mail.gmail.com/

Link: https://lkml.kernel.org/r/20230903151328.2981432-1-joel@joelfernandes.org
Link: https://lkml.kernel.org/r/20230903151328.2981432-2-joel@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: hugetlb_vmemmap: fix hugetlb page number decrease failed on movable nodes
Yuan Can [Tue, 5 Sep 2023 12:45:03 +0000 (20:45 +0800)]
mm: hugetlb_vmemmap: fix hugetlb page number decrease failed on movable nodes

The decreasing of hugetlb pages number failed with the following message
given:

 sh: page allocation failure: order:0, mode:0x204cc0(GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_THISNODE)
 CPU: 1 PID: 112 Comm: sh Not tainted 6.5.0-rc7-... #45
 Hardware name: linux,dummy-virt (DT)
 Call trace:
  dump_backtrace.part.6+0x84/0xe4
  show_stack+0x18/0x24
  dump_stack_lvl+0x48/0x60
  dump_stack+0x18/0x24
  warn_alloc+0x100/0x1bc
  __alloc_pages_slowpath.constprop.107+0xa40/0xad8
  __alloc_pages+0x244/0x2d0
  hugetlb_vmemmap_restore+0x104/0x1e4
  __update_and_free_hugetlb_folio+0x44/0x1f4
  update_and_free_hugetlb_folio+0x20/0x68
  update_and_free_pages_bulk+0x4c/0xac
  set_max_huge_pages+0x198/0x334
  nr_hugepages_store_common+0x118/0x178
  nr_hugepages_store+0x18/0x24
  kobj_attr_store+0x18/0x2c
  sysfs_kf_write+0x40/0x54
  kernfs_fop_write_iter+0x164/0x1dc
  vfs_write+0x3a8/0x460
  ksys_write+0x6c/0x100
  __arm64_sys_write+0x1c/0x28
  invoke_syscall+0x44/0x100
  el0_svc_common.constprop.1+0x6c/0xe4
  do_el0_svc+0x38/0x94
  el0_svc+0x28/0x74
  el0t_64_sync_handler+0xa0/0xc4
  el0t_64_sync+0x174/0x178
 Mem-Info:
  ...

The reason is that the hugetlb pages being released are allocated from
movable nodes, and with hugetlb_optimize_vmemmap enabled, vmemmap pages
need to be allocated from the same node during the hugetlb pages
releasing. With GFP_KERNEL and __GFP_THISNODE set, allocating from movable
node is always failed. Fix this problem by removing __GFP_THISNODE.

Link: https://lkml.kernel.org/r/20230905124503.24899-1-yuancan@huawei.com
Fixes: ad2fa3717b74 ("mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/vmstat: use this_cpu_try_cmpxchg in mod_{zone,node}_state
Uros Bizjak [Mon, 4 Sep 2023 15:08:49 +0000 (17:08 +0200)]
mm/vmstat: use this_cpu_try_cmpxchg in mod_{zone,node}_state

Use this_cpu_try_cmpxchg instead of this_cpu_cmpxchg (*ptr, old, new) ==
old in mod_zone_state and mod_node_state.  x86 CMPXCHG instruction returns
success in ZF flag, so this change saves a compare after cmpxchg (and
related move instruction in front of cmpxchg).

Also, try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg
fails.  There is no need to re-read the value in the loop.

No functional change intended.

Link: https://lkml.kernel.org/r/20230904150917.8318-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: convert DAX lock/unlock page to lock/unlock folio
Matthew Wilcox (Oracle) [Tue, 22 Aug 2023 23:13:14 +0000 (00:13 +0100)]
mm: convert DAX lock/unlock page to lock/unlock folio

The one caller of DAX lock/unlock page already calls compound_head(), so
use page_folio() instead, then use a folio throughout the DAX code to
remove uses of page->mapping and page->index.

[jane.chu@oracle.com: add comment to mf_generic_kill_procss(), simplify mf_generic_kill_procs:folio initialization]
Link: https://lkml.kernel.org/r/20230908222336.186313-1-jane.chu@oracle.com
Link: https://lkml.kernel.org/r/20230822231314.349200-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jane Chu <jane.chu@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: remove remnants of SPLIT_RSS_COUNTING
Mateusz Guzik [Wed, 23 Aug 2023 17:05:56 +0000 (19:05 +0200)]
mm: remove remnants of SPLIT_RSS_COUNTING

The feature got retired in f1a7941243c1 ("mm: convert mm's rss stats into
percpu_counter"), but the patch failed to fully clean it up.

Link: https://lkml.kernel.org/r/20230823170556.2281747-1-mjguzik@gmail.com
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/vmscan: use folio_migratetype() instead of get_pageblock_migratetype()
Vern Hao [Fri, 25 Aug 2023 07:57:34 +0000 (15:57 +0800)]
mm/vmscan: use folio_migratetype() instead of get_pageblock_migratetype()

In skip_cma(), we can use folio_migratetype() to replace
get_pageblock_migratetype().

Link: https://lkml.kernel.org/r/20230825075735.52436-1-user@VERNHAO-MC1
Signed-off-by: Vern Hao <vernhao@tencent.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: refactor si_mem_available()
Lorenzo Stoakes [Sun, 27 Aug 2023 11:08:48 +0000 (12:08 +0100)]
mm: refactor si_mem_available()

si_mem_available() needlessly places LRU statistics into an array before
retrieving only two of them, simply access those directly.

In addition, refactor the code so that the blocks of code which calculate
the page cache and reclaimable components each resemble one another to
clearly indicate we cap both against wmark_low in the same fashion.

Link: https://lkml.kernel.org/r/20230827110848.43510-1-lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/hugetlb: fix nodes huge page allocation when there are surplus pages
Xueshi Hu [Tue, 29 Aug 2023 03:33:43 +0000 (11:33 +0800)]
mm/hugetlb: fix nodes huge page allocation when there are surplus pages

In set_nr_huge_pages(), local variable "count" is used to record
persistent_huge_pages(), but when it cames to nodes huge page allocation,
the semantics changes to nr_huge_pages.  When there exists surplus huge
pages and using the interface under
/sys/devices/system/node/node*/hugepages to change huge page pool size,
this difference can result in the allocation of an unexpected number of
huge pages.

Steps to reproduce the bug:

Starting with:

  Node 0          Node 1    Total
HugePages_Total             0.00            0.00     0.00
HugePages_Free              0.00            0.00     0.00
HugePages_Surp              0.00            0.00     0.00

create 100 huge pages in Node 0 and consume it, then set Node 0 's
nr_hugepages to 0.

yields:

  Node 0          Node 1    Total
HugePages_Total           200.00            0.00   200.00
HugePages_Free              0.00            0.00     0.00
HugePages_Surp            200.00            0.00   200.00

write 100 to Node 1's nr_hugepages

echo 100 > /sys/devices/system/node/node1/\
hugepages/hugepages-2048kB/nr_hugepages

gets:

  Node 0          Node 1    Total
HugePages_Total           200.00          400.00   600.00
HugePages_Free              0.00          400.00   400.00
HugePages_Surp            200.00            0.00   200.00

Kernel is expected to create only 100 huge pages and it gives 200.

Link: https://lkml.kernel.org/r/20230829033343.467779-1-xueshi.hu@smartx.com
Fixes: 9a30523066cd ("hugetlb: add per node hstate attributes")
Signed-off-by: Xueshi Hu <xueshi.hu@smartx.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agohugetlb: set hugetlb page flag before optimizing vmemmap
Mike Kravetz [Tue, 29 Aug 2023 21:37:34 +0000 (14:37 -0700)]
hugetlb: set hugetlb page flag before optimizing vmemmap

Currently, vmemmap optimization of hugetlb pages is performed before the
hugetlb flag (previously hugetlb destructor) is set identifying it as a
hugetlb folio.  This means there is a window of time where an ordinary
folio does not have all associated vmemmap present.  The core mm only
expects vmemmap to be potentially optimized for hugetlb and device dax.
This can cause problems in code such as memory error handling that may
want to write to tail struct pages.

There is only one call to perform hugetlb vmemmap optimization today.  To
fix this issue, simply set the hugetlb flag before that call.

There was a similar issue in the free hugetlb path that was previously
addressed.  The two routines that optimize or restore hugetlb vmemmap
should only be passed hugetlb folios/pages.  To catch any callers not
following this rule, add VM_WARN_ON calls to the routines.  In the hugetlb
free code paths, some calls could be made to restore vmemmap after
clearing the hugetlb flag.  This was 'safe' as in these cases vmemmap was
already present and the call was a NOOP.  However, for consistency these
calls where eliminated so that we can add the VM_WARN_ON checks.

Link: https://lkml.kernel.org/r/20230829213734.69673-1-mike.kravetz@oracle.com
Fixes: f41f2ed43ca5 ("mm: hugetlb: free the vmemmap pages associated with each HugeTLB page")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Usama Arif <usama.arif@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: fix unaccount of memory on vma_link() failure
Anthony Yznaga [Wed, 30 Aug 2023 00:43:24 +0000 (17:43 -0700)]
mm: fix unaccount of memory on vma_link() failure

Fix insert_vm_struct() so that only accounted memory is unaccounted if
vma_link() fails.

Link: https://lkml.kernel.org/r/20230830004324.16101-1-anthony.yznaga@oracle.com
Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree")
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/mremap: fix unaccount of memory on vma_merge() failure
Anthony Yznaga [Wed, 30 Aug 2023 00:45:49 +0000 (17:45 -0700)]
mm/mremap: fix unaccount of memory on vma_merge() failure

Fix mremap so that only accounted memory is unaccounted if the mapping is
expandable but vma_merge() fails.

Link: https://lkml.kernel.org/r/20230830004549.16131-1-anthony.yznaga@oracle.com
Fixes: fdbef6149135 ("mm/mremap: don't account pages in vma_to_resize()")
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Brian Geffon <bgeffon@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests/mm: gup_longterm: fix a resource leak
Ding Xiang [Thu, 31 Aug 2023 09:31:44 +0000 (17:31 +0800)]
selftests/mm: gup_longterm: fix a resource leak

The opened file should be closed in run_with_tmpfile(), otherwise resource
leak will occur

Link: https://lkml.kernel.org/r/20230831093144.7520-1-dingxiang@cmss.chinamobile.com
Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/compaction: factor out code to test if we should run compaction for target order
Kemeng Shi [Fri, 1 Sep 2023 15:51:41 +0000 (23:51 +0800)]
mm/compaction: factor out code to test if we should run compaction for target order

We always do zone_watermark_ok check and compaction_suitable check
together to test if compaction for target order should be ran.  Factor
these code out to remove repeat code.

Link: https://lkml.kernel.org/r/20230901155141.249860-7-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/compaction: improve comment of is_via_compact_memory
Kemeng Shi [Fri, 1 Sep 2023 15:51:40 +0000 (23:51 +0800)]
mm/compaction: improve comment of is_via_compact_memory

We do proactive compaction with order == -1 via
1. /proc/sys/vm/compact_memory
2. /sys/devices/system/node/nodex/compact
3. /proc/sys/vm/compaction_proactiveness
Add missed situation in which order == -1.

Link: https://lkml.kernel.org/r/20230901155141.249860-6-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/compaction: remove repeat compact_blockskip_flush check in reset_isolation_suitable
Kemeng Shi [Fri, 1 Sep 2023 15:51:39 +0000 (23:51 +0800)]
mm/compaction: remove repeat compact_blockskip_flush check in reset_isolation_suitable

We have compact_blockskip_flush check in __reset_isolation_suitable, just
remove repeat check before __reset_isolation_suitable in
compact_blockskip_flush.

Link: https://lkml.kernel.org/r/20230901155141.249860-5-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/compaction: correctly return failure with bogus compound_order in strict mode
Kemeng Shi [Fri, 1 Sep 2023 15:51:38 +0000 (23:51 +0800)]
mm/compaction: correctly return failure with bogus compound_order in strict mode

In strict mode, we should return 0 if there is any hole in pageblock.  If
we successfully isolated pages at beginning at pageblock and then have a
bogus compound_order outside pageblock in next page.  We will abort search
loop with blockpfn > end_pfn.  Although we will limit blockpfn to end_pfn,
we will treat it as a successful isolation in strict mode as blockpfn is
not < end_pfn and return partial isolated pages.  Then
isolate_freepages_range may success unexpectly with hole in isolated
range.

Link: https://lkml.kernel.org/r/20230901155141.249860-4-shikemeng@huaweicloud.com
Fixes: 9fcd6d2e052e ("mm, compaction: skip compound pages by order in free scanner")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/compaction: call list_is_{first}/{last} more intuitively in move_freelist_{head...
Kemeng Shi [Fri, 1 Sep 2023 15:51:37 +0000 (23:51 +0800)]
mm/compaction: call list_is_{first}/{last} more intuitively in move_freelist_{head}/{tail}

We use move_freelist_head after list_for_each_entry_reverse to skip recent
pages.  And there is no need to do actual move if all freepages are
searched in list_for_each_entry_reverse, e.g.  freepage point to first
page in freelist.  It's more intuitively to call list_is_first with list
entry as the first argument and list head as the second argument to check
if list entry is the first list entry instead of call list_is_last with
list entry and list head passed in reverse.

Similarly, call list_is_last in move_freelist_tail is more intuitively.

Link: https://lkml.kernel.org/r/20230901155141.249860-3-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/compaction: use correct list in move_freelist_{head}/{tail}
Kemeng Shi [Fri, 1 Sep 2023 15:51:36 +0000 (23:51 +0800)]
mm/compaction: use correct list in move_freelist_{head}/{tail}

Patch series "Fixes and cleanups to compaction", v3.

This is a series to do fix and clean up to compaction.
Patch 1-2 fix and clean up freepage list operation.
Patch 3-4 fix and clean up isolation of freepages
Patch 7 factor code to check if compaction is needed for allocation order.

More details can be found in respective patches.

This patch (of 6):

The freepage is chained with buddy_list in freelist head. Use buddy_list
instead of lru to correct the list operation.

Link: https://lkml.kernel.org/r/20230901155141.249860-1-shikemeng@huaweicloud.com
Link: https://lkml.kernel.org/r/20230901155141.249860-2-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoLinux 6.6-rc4
Linus Torvalds [Sun, 1 Oct 2023 21:15:13 +0000 (14:15 -0700)]
Linux 6.6-rc4

13 months agoMerge tag 'kbuild-fixes-v6.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 1 Oct 2023 20:48:46 +0000 (13:48 -0700)]
Merge tag 'kbuild-fixes-v6.6-2' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Fix the module compression with xz so the in-kernel decompressor
   works

 - Document a kconfig idiom to express an optional dependency between
   modules

 - Make modpost, when W=1 is given, detect broken drivers that reference
   .exit.* sections

 - Remove unused code

* tag 'kbuild-fixes-v6.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: remove stale code for 'source' symlink in packaging scripts
  modpost: Don't let "driver"s reference .exit.*
  vmlinux.lds.h: remove unused CPU_KEEP and CPU_DISCARD macros
  modpost: add missing else to the "of" check
  Documentation: kbuild: explain handling optional dependencies
  kbuild: Use CRC32 and a 1MiB dictionary for XZ compressed modules

13 months agoMerge tag 'mm-hotfixes-stable-2023-10-01-08-34' of git://git.kernel.org/pub/scm/linux...
Linus Torvalds [Sun, 1 Oct 2023 20:33:25 +0000 (13:33 -0700)]
Merge tag 'mm-hotfixes-stable-2023-10-01-08-34' of git://git./linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Fourteen hotfixes, eleven of which are cc:stable. The remainder
  pertain to issues which were introduced after 6.5"

* tag 'mm-hotfixes-stable-2023-10-01-08-34' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  Crash: add lock to serialize crash hotplug handling
  selftests/mm: fix awk usage in charge_reserved_hugetlb.sh and hugetlb_reparenting_test.sh that may cause error
  mm: mempolicy: keep VMA walk if both MPOL_MF_STRICT and MPOL_MF_MOVE are specified
  mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()
  mm, memcg: reconsider kmem.limit_in_bytes deprecation
  mm: zswap: fix potential memory corruption on duplicate store
  arm64: hugetlb: fix set_huge_pte_at() to work with all swap entries
  mm: hugetlb: add huge page size param to set_huge_pte_at()
  maple_tree: add MAS_UNDERFLOW and MAS_OVERFLOW states
  maple_tree: add mas_is_active() to detect in-tree walks
  nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()
  mm: abstract moving to the next PFN
  mm: report success more often from filemap_map_folio_range()
  fs: binfmt_elf_efpic: fix personality for ELF-FDPIC

13 months agoMerge tag 'char-misc-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 1 Oct 2023 19:50:04 +0000 (12:50 -0700)]
Merge tag 'char-misc-6.6-rc4' of git://git./linux/kernel/git/gregkh/char-misc

Pull misc driver fix from Greg KH:
 "Here is a single, much requested, fix for a set of misc drivers to
  resolve a much reported regression in the -rc series that has also
  propagated back to the stable releases. Sorry for the delay, lots of
  conference travel for a few weeks put me very far behind in patch
  wrangling.

  It has been reported by many to resolve the reported problem, and has
  been in linux-next with no reported issues"

* tag 'char-misc-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  misc: rtsx: Fix some platforms can not boot and move the l1ss judgment to probe

13 months agoMerge tag 'tty-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Sun, 1 Oct 2023 19:44:45 +0000 (12:44 -0700)]
Merge tag 'tty-6.6-rc4' of git://git./linux/kernel/git/gregkh/tty

Pull tty / serial driver fixes from Greg KH:
 "Here are two tty/serial driver fixes for 6.6-rc4 that resolve some
  reported regressions:

   - revert a n_gsm change that ended up causing problems

   - 8250_port fix for irq data

  both have been in linux-next for over a week with no reported
  problems"

* tag 'tty-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"
  serial: 8250_port: Check IRQ data before use

13 months agoMerge tag 'x86-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 1 Oct 2023 16:50:58 +0000 (09:50 -0700)]
Merge tag 'x86-urgent-2023-10-01' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: a kerneldoc build warning fix, add SRSO mitigation for
  AMD-derived Hygon processors, and fix a SGX kernel crash in the page
  fault handler that can trigger when ksgxd races to reclaim the SECS
  special page, by making the SECS page unswappable"

* tag 'x86-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sgx: Resolves SECS reclaim vs. page fault for EAUG race
  x86/srso: Add SRSO mitigation for Hygon processors
  x86/kgdb: Fix a kerneldoc warning when build with W=1

13 months agoMerge tag 'timers-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 1 Oct 2023 16:41:58 +0000 (09:41 -0700)]
Merge tag 'timers-urgent-2023-10-01' of git://git./linux/kernel/git/tip/tip

Pull timer fix from Ingo Molnar:
 "Fix a spurious kernel warning during CPU hotplug events that may
  trigger when timer/hrtimer softirqs are pending, which are otherwise
  hotplug-safe and don't merit a warning"

* tag 'timers-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timers: Tag (hr)timer softirq as hotplug safe

13 months agoMerge tag 'sched-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 1 Oct 2023 16:38:05 +0000 (09:38 -0700)]
Merge tag 'sched-urgent-2023-10-01' of git://git./linux/kernel/git/tip/tip

Pull scheduler fix from Ingo Molnar:
 "Fix a RT tasks related lockup/live-lock during CPU offlining"

* tag 'sched-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/rt: Fix live lock between select_fallback_rq() and RT push

13 months agoMerge tag 'perf-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 1 Oct 2023 16:34:53 +0000 (09:34 -0700)]
Merge tag 'perf-urgent-2023-10-01' of git://git./linux/kernel/git/tip/tip

Pull perf event fixes from Ingo Molnar:
 "Misc fixes: work around an AMD microcode bug on certain models, and
  fix kexec kernel PMI handlers on AMD systems that get loaded on older
  kernels that have an unexpected register state"

* tag 'perf-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/amd: Do not WARN() on every IRQ
  perf/x86/amd/core: Fix overflow reset on hotplug

13 months agokbuild: remove stale code for 'source' symlink in packaging scripts
Masahiro Yamada [Sun, 1 Oct 2023 14:03:39 +0000 (23:03 +0900)]
kbuild: remove stale code for 'source' symlink in packaging scripts

Since commit d8131c2965d5 ("kbuild: remove $(MODLIB)/source symlink"),
modules_install does not create the 'source' symlink.

Remove the stale code from builddeb and kernel.spec.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
13 months agomodpost: Don't let "driver"s reference .exit.*
Uwe Kleine-König [Sat, 30 Sep 2023 16:52:04 +0000 (18:52 +0200)]
modpost: Don't let "driver"s reference .exit.*

Drivers must not reference functions marked with __exit as these likely
are not available when the code is built-in.

There are few creative offenders uncovered for example in ARCH=amd64
allmodconfig builds. So only trigger the section mismatch warning for
W=1 builds.

The dual rule that drivers must not reference .init.* is implemented
since commit 0db252452378 ("modpost: don't allow *driver to reference
.init.*") which however missed that .exit.* should be handled in the
same way.

Thanks to Masahiro Yamada and Arnd Bergmann who gave valuable hints to
find this improvement.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
13 months agovmlinux.lds.h: remove unused CPU_KEEP and CPU_DISCARD macros
Masahiro Yamada [Sat, 30 Sep 2023 07:13:35 +0000 (16:13 +0900)]
vmlinux.lds.h: remove unused CPU_KEEP and CPU_DISCARD macros

Remove the left-over of commit e24f6628811e ("modpost: remove all
traces of cpuinit/cpuexit sections").

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com>
13 months agomodpost: add missing else to the "of" check
Mauricio Faria de Oliveira [Thu, 28 Sep 2023 20:28:07 +0000 (17:28 -0300)]
modpost: add missing else to the "of" check

Without this 'else' statement, an "usb" name goes into two handlers:
the first/previous 'if' statement _AND_ the for-loop over 'devtable',
but the latter is useless as it has no 'usb' device_id entry anyway.

Tested with allmodconfig before/after patch; no changes to *.mod.c:

    git checkout v6.6-rc3
    make -j$(nproc) allmodconfig
    make -j$(nproc) olddefconfig

    make -j$(nproc)
    find . -name '*.mod.c' | cpio -pd /tmp/before

    # apply patch

    make -j$(nproc)
    find . -name '*.mod.c' | cpio -pd /tmp/after

    diff -r /tmp/before/ /tmp/after/
    # no difference

Fixes: acbef7b76629 ("modpost: fix module autoloading for OF devices with generic compatible property")
Signed-off-by: Mauricio Faria de Oliveira <mfo@canonical.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
13 months agoMerge tag 'soc-fixes-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Linus Torvalds [Sun, 1 Oct 2023 01:41:37 +0000 (18:41 -0700)]
Merge tag 'soc-fixes-6.6' of git://git./linux/kernel/git/soc/soc

Pull ARM SoC fixes from Arnd Bergmann:
 "These are the latest bug fixes that have come up in the soc tree. Most
  of these are fairly minor. Most notably, the majority of changes this
  time are not for dts files as usual.

   - Updates to the addresses of the broadcom and aspeed entries in the
     MAINTAINERS file.

   - Defconfig updates to address a regression on samsung and a build
     warning from an unknown Kconfig symbol

   - Build fixes for the StrongARM and Uniphier platforms

   - Code fixes for SCMI and FF-A firmware drivers, both of which had a
     simple bug that resulted in invalid data, and a lesser fix for the
     optee firmware driver

   - Multiple fixes for the recently added loongson/loongarch "guts" soc
     driver

   - Devicetree fixes for RISC-V on the startfive platform, addressing
     issues with NOR flash, usb and uart.

   - Multiple fixes for NXP i.MX8/i.MX9 dts files, fixing problems with
     clock, gpio, hdmi settings and the Makefile

   - Bug fixes for i.MX firmware code and the OCOTP soc driver

   - Multiple fixes for the TI sysc bus driver

   - Minor dts updates for TI omap dts files, to address boot time
     warnings and errors"

* tag 'soc-fixes-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (35 commits)
  MAINTAINERS: Fix Florian Fainelli's email address
  arm64: defconfig: enable syscon-poweroff driver
  ARM: locomo: fix locomolcd_power declaration
  soc: loongson: loongson2_guts: Remove unneeded semicolon
  soc: loongson: loongson2_guts: Convert to devm_platform_ioremap_resource()
  soc: loongson: loongson_pm2: Populate children syscon nodes
  dt-bindings: soc: loongson,ls2k-pmc: Allow syscon-reboot/syscon-poweroff as child
  soc: loongson: loongson_pm2: Drop useless of_device_id compatible
  dt-bindings: soc: loongson,ls2k-pmc: Use fallbacks for ls2k-pmc compatible
  soc: loongson: loongson_pm2: Add dependency for INPUT
  arm64: defconfig: remove CONFIG_COMMON_CLK_NPCM8XX=y
  ARM: uniphier: fix cache kernel-doc warnings
  MAINTAINERS: aspeed: Update Andrew's email address
  MAINTAINERS: aspeed: Update git tree URL
  firmware: arm_ffa: Don't set the memory region attributes for MEM_LEND
  arm64: dts: imx: Add imx8mm-prt8mm.dtb to build
  arm64: dts: imx8mm-evk: Fix hdmi@3d node
  soc: imx8m: Enable OCOTP clock for imx8mm before reading registers
  arm64: dts: imx8mp-beacon-kit: Fix audio_pll2 clock
  arm64: dts: imx8mp: Fix SDMA2/3 clocks
  ...

13 months agoMerge tag 'trace-v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
Linus Torvalds [Sun, 1 Oct 2023 01:19:02 +0000 (18:19 -0700)]
Merge tag 'trace-v6.6-rc3' of git://git./linux/kernel/git/trace/linux-trace

Pull tracing fixes from Steven Rostedt:

 - Make sure 32-bit applications using user events have aligned access
   when running on a 64-bit kernel.

 - Add cond_resched in the loop that handles converting enums in
   print_fmt string is trace events.

 - Fix premature wake ups of polling processes in the tracing ring
   buffer. When a task polls waiting for a percentage of the ring buffer
   to be filled, the writer still will wake it up at every event. Add
   the polling's percentage to the "shortest_full" list to tell the
   writer when to wake it up.

 - For eventfs dir lookups on dynamic events, an event system's only
   event could be removed, leaving its dentry with no children. This is
   totally legitimate. But in eventfs_release() it must not access the
   children array, as it is only allocated when the dentry has children.

* tag 'trace-v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  eventfs: Test for dentries array allocated in eventfs_release()
  tracing/user_events: Align set_bit() address for all archs
  tracing: relax trace_event_eval_update() execution with cond_resched()
  ring-buffer: Update "shortest_full" in polling

13 months agoeventfs: Test for dentries array allocated in eventfs_release()
Steven Rostedt (Google) [Sat, 30 Sep 2023 13:01:06 +0000 (09:01 -0400)]
eventfs: Test for dentries array allocated in eventfs_release()

The dcache_dir_open_wrapper() could be called when a dynamic event is
being deleted leaving a dentry with no children. In this case the
dlist->dentries array will never be allocated. This needs to be checked
for in eventfs_release(), otherwise it will trigger a NULL pointer
dereference.

Link: https://lore.kernel.org/linux-trace-kernel/20230930090106.1c3164e9@rorschach.local.home
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Fixes: ef36b4f92868 ("eventfs: Remember what dentries were created on dir open")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
13 months agotracing/user_events: Align set_bit() address for all archs
Beau Belgrave [Mon, 25 Sep 2023 23:08:28 +0000 (23:08 +0000)]
tracing/user_events: Align set_bit() address for all archs

All architectures should use a long aligned address passed to set_bit().
User processes can pass either a 32-bit or 64-bit sized value to be
updated when tracing is enabled when on a 64-bit kernel. Both cases are
ensured to be naturally aligned, however, that is not enough. The
address must be long aligned without affecting checks on the value
within the user process which require different adjustments for the bit
for little and big endian CPUs.

Add a compat flag to user_event_enabler that indicates when a 32-bit
value is being used on a 64-bit kernel. Long align addresses and correct
the bit to be used by set_bit() to account for this alignment. Ensure
compat flags are copied during forks and used during deletion clears.

Link: https://lore.kernel.org/linux-trace-kernel/20230925230829.341-2-beaub@linux.microsoft.com
Link: https://lore.kernel.org/linux-trace-kernel/20230914131102.179100-1-cleger@rivosinc.com/
Cc: stable@vger.kernel.org
Fixes: 7235759084a4 ("tracing/user_events: Use remote writes for event enablement")
Reported-by: Clément Léger <cleger@rivosinc.com>
Suggested-by: Clément Léger <cleger@rivosinc.com>
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
13 months agotracing: relax trace_event_eval_update() execution with cond_resched()
Clément Léger [Fri, 29 Sep 2023 19:16:37 +0000 (21:16 +0200)]
tracing: relax trace_event_eval_update() execution with cond_resched()

When kernel is compiled without preemption, the eval_map_work_func()
(which calls trace_event_eval_update()) will not be preempted up to its
complete execution. This can actually cause a problem since if another
CPU call stop_machine(), the call will have to wait for the
eval_map_work_func() function to finish executing in the workqueue
before being able to be scheduled. This problem was observe on a SMP
system at boot time, when the CPU calling the initcalls executed
clocksource_done_booting() which in the end calls stop_machine(). We
observed a 1 second delay because one CPU was executing
eval_map_work_func() and was not preempted by the stop_machine() task.

Adding a call to cond_resched() in trace_event_eval_update() allows
other tasks to be executed and thus continue working asynchronously
like before without blocking any pending task at boot time.

Link: https://lore.kernel.org/linux-trace-kernel/20230929191637.416931-1-cleger@rivosinc.com
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
13 months agoring-buffer: Update "shortest_full" in polling
Steven Rostedt (Google) [Fri, 29 Sep 2023 22:01:13 +0000 (18:01 -0400)]
ring-buffer: Update "shortest_full" in polling

It was discovered that the ring buffer polling was incorrectly stating
that read would not block, but that's because polling did not take into
account that reads will block if the "buffer-percent" was set. Instead,
the ring buffer polling would say reads would not block if there was any
data in the ring buffer. This was incorrect behavior from a user space
point of view. This was fixed by commit 42fb0a1e84ff by having the polling
code check if the ring buffer had more data than what the user specified
"buffer percent" had.

The problem now is that the polling code did not register itself to the
writer that it wanted to wait for a specific "full" value of the ring
buffer. The result was that the writer would wake the polling waiter
whenever there was a new event. The polling waiter would then wake up, see
that there's not enough data in the ring buffer to notify user space and
then go back to sleep. The next event would wake it up again.

Before the polling fix was added, the code would wake up around 100 times
for a hackbench 30 benchmark. After the "fix", due to the constant waking
of the writer, it would wake up over 11,0000 times! It would never leave
the kernel, so the user space behavior was still "correct", but this
definitely is not the desired effect.

To fix this, have the polling code add what it's waiting for to the
"shortest_full" variable, to tell the writer not to wake it up if the
buffer is not as full as it expects to be.

Note, after this fix, it appears that the waiter is now woken up around 2x
the times it was before (~200). This is a tremendous improvement from the
11,000 times, but I will need to spend some time to see why polling is
more aggressive in its wakeups than the read blocking code.

Link: https://lore.kernel.org/linux-trace-kernel/20230929180113.01c2cae3@rorschach.local.home
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Fixes: 42fb0a1e84ff ("tracing/ring-buffer: Have polling block on watermark")
Reported-by: Julia Lawall <julia.lawall@inria.fr>
Tested-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
13 months agoMerge tag 'dma-mapping-6.6-2023-09-30' of git://git.infradead.org/users/hch/dma-mapping
Linus Torvalds [Sat, 30 Sep 2023 18:07:26 +0000 (11:07 -0700)]
Merge tag 'dma-mapping-6.6-2023-09-30' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:

 - fix the narea calculation in swiotlb initialization (Ross Lagerwall)

 - fix the check whether a device has used swiotlb (Petr Tesarik)

* tag 'dma-mapping-6.6-2023-09-30' of git://git.infradead.org/users/hch/dma-mapping:
  swiotlb: fix the check whether a device has used software IO TLB
  swiotlb: use the calculated number of areas

13 months agoMerge tag 'iomap-6.6-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Linus Torvalds [Sat, 30 Sep 2023 18:01:38 +0000 (11:01 -0700)]
Merge tag 'iomap-6.6-fixes-4' of git://git./fs/xfs/xfs-linux

Pull iomap fixes from Darrick Wong:

 - Handle a race between writing and shrinking block devices by
   returning EIO

 - Fix a typo in a comment

* tag 'iomap-6.6-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: Spelling s/preceeding/preceding/g
  iomap: add a workaround for racy i_size updates on block devices

13 months agoMerge tag 'i2c-for-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Sat, 30 Sep 2023 17:07:33 +0000 (10:07 -0700)]
Merge tag 'i2c-for-6.6-rc4' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Usual business: a driver fix, a DT fix, a minor core fix"

* tag 'i2c-for-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: npcm7xx: Fix callback completion ordering
  i2c: mux: Avoid potential false error message in i2c_mux_add_adapter
  dt-bindings: i2c: mxs: Pass ref and 'unevaluatedProperties: false'

13 months agoMerge tag 'acpi-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Sat, 30 Sep 2023 16:59:37 +0000 (09:59 -0700)]
Merge tag 'acpi-6.6-rc4' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fix from Rafael Wysocki:
 "Fix a possible NULL pointer dereference in the error path of
  acpi_video_bus_add() resulting from recent changes (Dinghao Liu)"

* tag 'acpi-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: video: Fix NULL pointer dereference in acpi_video_bus_add()

13 months agoMerge tag 'powerpc-6.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Sat, 30 Sep 2023 16:53:09 +0000 (09:53 -0700)]
Merge tag 'powerpc-6.6-3' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - Fix arch_stack_walk_reliable(), used by live patching

 - Fix powerpc selftests to work with run_kselftest.sh

Thanks to Joe Lawrence and Petr Mladek.

* tag 'powerpc-6.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  selftests/powerpc: Fix emit_tests to work with run_kselftest.sh
  powerpc/stacktrace: Fix arch_stack_walk_reliable()

13 months agoMerge tag 'nfsd-6.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Linus Torvalds [Sat, 30 Sep 2023 16:44:48 +0000 (09:44 -0700)]
Merge tag 'nfsd-6.6-2' of git://git./linux/kernel/git/cel/linux

Pull nfsd fix from Chuck Lever:

 - Fix NFSv4 READ corner case

* tag 'nfsd-6.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  NFSD: Fix zero NFSv4 READ results when RQ_SPLICE_OK is not set

13 months agoMerge tag '6.6-rc3-smb3-client-fix' of git://git.samba.org/sfrench/cifs-2.6
Linus Torvalds [Sat, 30 Sep 2023 16:39:23 +0000 (09:39 -0700)]
Merge tag '6.6-rc3-smb3-client-fix' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fix from Steve French:
 "Fix for password freeing potential oops (also for stable)"

* tag '6.6-rc3-smb3-client-fix' of git://git.samba.org/sfrench/cifs-2.6:
  fs/smb/client: Reset password pointer to NULL

13 months agoCrash: add lock to serialize crash hotplug handling
Baoquan He [Tue, 26 Sep 2023 12:09:05 +0000 (20:09 +0800)]
Crash: add lock to serialize crash hotplug handling

Eric reported that handling corresponding crash hotplug event can be
failed easily when many memory hotplug event are notified in a short
period.  They failed because failing to take __kexec_lock.

=======
[   78.714569] Fallback order for Node 0: 0
[   78.714575] Built 1 zonelists, mobility grouping on.  Total pages: 1817886
[   78.717133] Policy zone: Normal
[   78.724423] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate
[   78.727207] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate
[   80.056643] PEFILE: Unsigned PE binary
=======

The memory hotplug events are notified very quickly and very many, while
the handling of crash hotplug is much slower relatively.  So the atomic
variable __kexec_lock and kexec_trylock() can't guarantee the
serialization of crash hotplug handling.

Here, add a new mutex lock __crash_hotplug_lock to serialize crash hotplug
handling specifically.  This doesn't impact the usage of __kexec_lock.

Link: https://lkml.kernel.org/r/20230926120905.392903-1-bhe@redhat.com
Fixes: 247262756121 ("crash: add generic infrastructure for crash hotplug support")
Signed-off-by: Baoquan He <bhe@redhat.com>
Tested-by: Eric DeVolder <eric.devolder@oracle.com>
Reviewed-by: Eric DeVolder <eric.devolder@oracle.com>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Cc: Sourabh Jain <sourabhjain@linux.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoselftests/mm: fix awk usage in charge_reserved_hugetlb.sh and hugetlb_reparenting_tes...
Juntong Deng [Tue, 26 Sep 2023 18:19:44 +0000 (02:19 +0800)]
selftests/mm: fix awk usage in charge_reserved_hugetlb.sh and hugetlb_reparenting_test.sh that may cause error

According to the awk manual, the -e option does not need to be specified
in front of 'program' (unless you need to mix program-file).

The redundant -e option can cause error when users use awk tools other
than gawk (for example, mawk does not support the -e option).

Error Example:
awk: not an option: -e

Link: https://lkml.kernel.org/r/VI1P193MB075228810591AF2FDD7D42C599C3A@VI1P193MB0752.EURP193.PROD.OUTLOOK.COM
Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: mempolicy: keep VMA walk if both MPOL_MF_STRICT and MPOL_MF_MOVE are specified
Yang Shi [Wed, 20 Sep 2023 22:32:42 +0000 (15:32 -0700)]
mm: mempolicy: keep VMA walk if both MPOL_MF_STRICT and MPOL_MF_MOVE are specified

When calling mbind() with MPOL_MF_{MOVE|MOVEALL} | MPOL_MF_STRICT, kernel
should attempt to migrate all existing pages, and return -EIO if there is
misplaced or unmovable page.  Then commit 6f4576e3687b ("mempolicy: apply
page table walker on queue_pages_range()") messed up the return value and
didn't break VMA scan early ianymore when MPOL_MF_STRICT alone.  The
return value problem was fixed by commit a7f40cfe3b7a ("mm: mempolicy:
make mbind() return -EIO when MPOL_MF_STRICT is specified"), but it broke
the VMA walk early if unmovable page is met, it may cause some pages are
not migrated as expected.

The code should conceptually do:

 if (MPOL_MF_MOVE|MOVEALL)
     scan all vmas
     try to migrate the existing pages
     return success
 else if (MPOL_MF_MOVE* | MPOL_MF_STRICT)
     scan all vmas
     try to migrate the existing pages
     return -EIO if unmovable or migration failed
 else /* MPOL_MF_STRICT alone */
     break early if meets unmovable and don't call mbind_range() at all
 else /* none of those flags */
     check the ranges in test_walk, EFAULT without mbind_range() if discontig.

Fixed the behavior.

Link: https://lkml.kernel.org/r/20230920223242.3425775-1-yang@os.amperecomputing.com
Fixes: a7f40cfe3b7a ("mm: mempolicy: make mbind() return -EIO when MPOL_MF_STRICT is specified")
Signed-off-by: Yang Shi <yang@os.amperecomputing.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org> [4.9+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()
Jinjie Ruan [Mon, 25 Sep 2023 07:20:59 +0000 (15:20 +0800)]
mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()

When CONFIG_DAMON_VADDR_KUNIT_TEST=y and making CONFIG_DEBUG_KMEMLEAK=y
and CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y, the below memory leak is detected.

Since commit 9f86d624292c ("mm/damon/vaddr-test: remove unnecessary
variables"), the damon_destroy_ctx() is removed, but still call
damon_new_target() and damon_new_region(), the damon_region which is
allocated by kmem_cache_alloc() in damon_new_region() and the damon_target
which is allocated by kmalloc in damon_new_target() are not freed.  And
the damon_region which is allocated in damon_new_region() in
damon_set_regions() is also not freed.

So use damon_destroy_target to free all the damon_regions and damon_target.

    unreferenced object 0xffff888107c9a940 (size 64):
      comm "kunit_try_catch", pid 1069, jiffies 4294670592 (age 732.761s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 06 00 00 00 6b 6b 6b 6b  ............kkkk
        60 c7 9c 07 81 88 ff ff f8 cb 9c 07 81 88 ff ff  `...............
      backtrace:
        [<ffffffff817e0167>] kmalloc_trace+0x27/0xa0
        [<ffffffff819c11cf>] damon_new_target+0x3f/0x1b0
        [<ffffffff819c7d55>] damon_do_test_apply_three_regions.constprop.0+0x95/0x3e0
        [<ffffffff819c82be>] damon_test_apply_three_regions1+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff8881079cc740 (size 56):
      comm "kunit_try_catch", pid 1069, jiffies 4294670592 (age 732.761s)
      hex dump (first 32 bytes):
        05 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00  ................
        6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b  kkkkkkkk....kkkk
      backtrace:
        [<ffffffff819bc492>] damon_new_region+0x22/0x1c0
        [<ffffffff819c7d91>] damon_do_test_apply_three_regions.constprop.0+0xd1/0x3e0
        [<ffffffff819c82be>] damon_test_apply_three_regions1+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff888107c9ac40 (size 64):
      comm "kunit_try_catch", pid 1071, jiffies 4294670595 (age 732.843s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 06 00 00 00 6b 6b 6b 6b  ............kkkk
        a0 cc 9c 07 81 88 ff ff 78 a1 76 07 81 88 ff ff  ........x.v.....
      backtrace:
        [<ffffffff817e0167>] kmalloc_trace+0x27/0xa0
        [<ffffffff819c11cf>] damon_new_target+0x3f/0x1b0
        [<ffffffff819c7d55>] damon_do_test_apply_three_regions.constprop.0+0x95/0x3e0
        [<ffffffff819c851e>] damon_test_apply_three_regions2+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff8881079ccc80 (size 56):
      comm "kunit_try_catch", pid 1071, jiffies 4294670595 (age 732.843s)
      hex dump (first 32 bytes):
        05 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00  ................
        6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b  kkkkkkkk....kkkk
      backtrace:
        [<ffffffff819bc492>] damon_new_region+0x22/0x1c0
        [<ffffffff819c7d91>] damon_do_test_apply_three_regions.constprop.0+0xd1/0x3e0
        [<ffffffff819c851e>] damon_test_apply_three_regions2+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff888107c9af40 (size 64):
      comm "kunit_try_catch", pid 1073, jiffies 4294670597 (age 733.011s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 06 00 00 00 6b 6b 6b 6b  ............kkkk
        20 a2 76 07 81 88 ff ff b8 a6 76 07 81 88 ff ff   .v.......v.....
      backtrace:
        [<ffffffff817e0167>] kmalloc_trace+0x27/0xa0
        [<ffffffff819c11cf>] damon_new_target+0x3f/0x1b0
        [<ffffffff819c7d55>] damon_do_test_apply_three_regions.constprop.0+0x95/0x3e0
        [<ffffffff819c877e>] damon_test_apply_three_regions3+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff88810776a200 (size 56):
      comm "kunit_try_catch", pid 1073, jiffies 4294670597 (age 733.011s)
      hex dump (first 32 bytes):
        05 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00  ................
        6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b  kkkkkkkk....kkkk
      backtrace:
        [<ffffffff819bc492>] damon_new_region+0x22/0x1c0
        [<ffffffff819c7d91>] damon_do_test_apply_three_regions.constprop.0+0xd1/0x3e0
        [<ffffffff819c877e>] damon_test_apply_three_regions3+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff88810776a740 (size 56):
      comm "kunit_try_catch", pid 1073, jiffies 4294670597 (age 733.025s)
      hex dump (first 32 bytes):
        3d 00 00 00 00 00 00 00 3f 00 00 00 00 00 00 00  =.......?.......
        6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b  kkkkkkkk....kkkk
      backtrace:
        [<ffffffff819bc492>] damon_new_region+0x22/0x1c0
        [<ffffffff819bfcc2>] damon_set_regions+0x4c2/0x8e0
        [<ffffffff819c7dbb>] damon_do_test_apply_three_regions.constprop.0+0xfb/0x3e0
        [<ffffffff819c877e>] damon_test_apply_three_regions3+0x21e/0x260
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff888108038240 (size 64):
      comm "kunit_try_catch", pid 1075, jiffies 4294670600 (age 733.022s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 03 00 00 00 6b 6b 6b 6b  ............kkkk
        48 ad 76 07 81 88 ff ff 98 ae 76 07 81 88 ff ff  H.v.......v.....
      backtrace:
        [<ffffffff817e0167>] kmalloc_trace+0x27/0xa0
        [<ffffffff819c11cf>] damon_new_target+0x3f/0x1b0
        [<ffffffff819c7d55>] damon_do_test_apply_three_regions.constprop.0+0x95/0x3e0
        [<ffffffff819c898d>] damon_test_apply_three_regions4+0x1cd/0x210
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20
    unreferenced object 0xffff88810776ad28 (size 56):
      comm "kunit_try_catch", pid 1075, jiffies 4294670600 (age 733.022s)
      hex dump (first 32 bytes):
        05 00 00 00 00 00 00 00 07 00 00 00 00 00 00 00  ................
        6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b  kkkkkkkk....kkkk
      backtrace:
        [<ffffffff819bc492>] damon_new_region+0x22/0x1c0
        [<ffffffff819bfcc2>] damon_set_regions+0x4c2/0x8e0
        [<ffffffff819c7dbb>] damon_do_test_apply_three_regions.constprop.0+0xfb/0x3e0
        [<ffffffff819c898d>] damon_test_apply_three_regions4+0x1cd/0x210
        [<ffffffff829fce6a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
        [<ffffffff81237cf6>] kthread+0x2b6/0x380
        [<ffffffff81097add>] ret_from_fork+0x2d/0x70
        [<ffffffff81003791>] ret_from_fork_asm+0x11/0x20

Link: https://lkml.kernel.org/r/20230925072100.3725620-1-ruanjinjie@huawei.com
Fixes: 9f86d624292c ("mm/damon/vaddr-test: remove unnecessary variables")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm, memcg: reconsider kmem.limit_in_bytes deprecation
Michal Hocko [Thu, 21 Sep 2023 07:38:29 +0000 (09:38 +0200)]
mm, memcg: reconsider kmem.limit_in_bytes deprecation

This reverts commits 86327e8eb94c ("memcg: drop kmem.limit_in_bytes") and
partially reverts 58056f77502f ("memcg, kmem: further deprecate
kmem.limit_in_bytes") which have incrementally removed support for the
kernel memory accounting hard limit.  Unfortunately it has turned out that
there is still userspace depending on the existence of
memory.kmem.limit_in_bytes [1].  The underlying functionality is not
really required but the non-existent file just confuses the userspace
which fails in the result.  The patch to fix this on the userspace side
has been submitted but it is hard to predict how it will propagate through
the maze of 3rd party consumers of the software.

Now, reverting alone 86327e8eb94c is not an option because there is
another set of userspace which cannot cope with ENOTSUPP returned when
writing to the file.  Therefore we have to go and revisit 58056f77502f as
well.  There are two ways to go ahead.  Either we give up on the
deprecation and fully revert 58056f77502f as well or we can keep
kmem.limit_in_bytes but make the write a noop and warn about the fact.
This should work for both known breaking workloads which depend on the
existence but do not depend on the hard limit enforcement.

Note to backporters to stable trees.  a8c49af3be5f ("memcg: add per-memcg
total kernel memory stat") introduced in 4.18 has added memcg_account_kmem
so the accounting is not done by obj_cgroup_charge_pages directly for v1
anymore.  Prior kernels need to add it explicitly (thanks to Johannes for
pointing this out).

[akpm@linux-foundation.org: fix build - remove unused local]
Link: http://lkml.kernel.org/r/20230920081101.GA12096@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net
Link: https://lkml.kernel.org/r/ZRE5VJozPZt9bRPy@dhcp22.suse.cz
Fixes: 86327e8eb94c ("memcg: drop kmem.limit_in_bytes")
Fixes: 58056f77502f ("memcg, kmem: further deprecate kmem.limit_in_bytes")
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Tejun heo <tj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: zswap: fix potential memory corruption on duplicate store
Domenico Cerasuolo [Fri, 22 Sep 2023 17:22:11 +0000 (19:22 +0200)]
mm: zswap: fix potential memory corruption on duplicate store

While stress-testing zswap a memory corruption was happening when writing
back pages.  __frontswap_store used to check for duplicate entries before
attempting to store a page in zswap, this was because if the store fails
the old entry isn't removed from the tree.  This change removes duplicate
entries in zswap_store before the actual attempt.

[cerasuolodomenico@gmail.com: add a warning and a comment, per Johannes]
Link: https://lkml.kernel.org/r/20230925130002.1929369-1-cerasuolodomenico@gmail.com
Link: https://lkml.kernel.org/r/20230922172211.1704917-1-cerasuolodomenico@gmail.com
Fixes: 42c06a0e8ebe ("mm: kill frontswap")
Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Nhat Pham <nphamcs@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoarm64: hugetlb: fix set_huge_pte_at() to work with all swap entries
Ryan Roberts [Fri, 22 Sep 2023 11:58:04 +0000 (12:58 +0100)]
arm64: hugetlb: fix set_huge_pte_at() to work with all swap entries

When called with a swap entry that does not embed a PFN (e.g.
PTE_MARKER_POISONED or PTE_MARKER_UFFD_WP), the previous implementation of
set_huge_pte_at() would either cause a BUG() to fire (if CONFIG_DEBUG_VM
is enabled) or cause a dereference of an invalid address and subsequent
panic.

arm64's huge pte implementation supports multiple huge page sizes, some of
which are implemented in the page table with multiple contiguous entries.
So set_huge_pte_at() needs to work out how big the logical pte is, so that
it can also work out how many physical ptes (or pmds) need to be written.
It previously did this by grabbing the folio out of the pte and querying
its size.

However, there are cases when the pte being set is actually a swap entry.
But this also used to work fine, because for huge ptes, we only ever saw
migration entries and hwpoison entries.  And both of these types of swap
entries have a PFN embedded, so the code would grab that and everything
still worked out.

But over time, more calls to set_huge_pte_at() have been added that set
swap entry types that do not embed a PFN.  And this causes the code to go
bang.  The triggering case is for the uffd poison test, commit
99aa77215ad0 ("selftests/mm: add uffd unit test for UFFDIO_POISON"), which
causes a PTE_MARKER_POISONED swap entry to be set, coutesey of commit
8a13897fb0da ("mm: userfaultfd: support UFFDIO_POISON for hugetlbfs") -
added in v6.5-rc7.  Although review shows that there are other call sites
that set PTE_MARKER_UFFD_WP (which also has no PFN), these don't trigger
on arm64 because arm64 doesn't support UFFD WP.

Arguably, the root cause is really due to commit 18f3962953e4 ("mm:
hugetlb: kill set_huge_swap_pte_at()"), which aimed to simplify the
interface to the core code by removing set_huge_swap_pte_at() (which took
a page size parameter) and replacing it with calls to set_huge_pte_at()
where the size was inferred from the folio, as descibed above.  While that
commit didn't break anything at the time, it did break the interface
because it couldn't handle swap entries without PFNs.  And since then new
callers have come along which rely on this working.  But given the
brokeness is only observable after commit 8a13897fb0da ("mm: userfaultfd:
support UFFDIO_POISON for hugetlbfs"), that one gets the Fixes tag.

Now that we have modified the set_huge_pte_at() interface to pass the huge
page size in the previous patch, we can trivially fix this issue.

Link: https://lkml.kernel.org/r/20230922115804.2043771-3-ryan.roberts@arm.com
Fixes: 8a13897fb0da ("mm: userfaultfd: support UFFDIO_POISON for hugetlbfs")
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: <stable@vger.kernel.org> [6.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: hugetlb: add huge page size param to set_huge_pte_at()
Ryan Roberts [Fri, 22 Sep 2023 11:58:03 +0000 (12:58 +0100)]
mm: hugetlb: add huge page size param to set_huge_pte_at()

Patch series "Fix set_huge_pte_at() panic on arm64", v2.

This series fixes a bug in arm64's implementation of set_huge_pte_at(),
which can result in an unprivileged user causing a kernel panic.  The
problem was triggered when running the new uffd poison mm selftest for
HUGETLB memory.  This test (and the uffd poison feature) was merged for
v6.5-rc7.

Ideally, I'd like to get this fix in for v6.6 and I've cc'ed stable
(correctly this time) to get it backported to v6.5, where the issue first
showed up.

Description of Bug
==================

arm64's huge pte implementation supports multiple huge page sizes, some of
which are implemented in the page table with multiple contiguous entries.
So set_huge_pte_at() needs to work out how big the logical pte is, so that
it can also work out how many physical ptes (or pmds) need to be written.
It previously did this by grabbing the folio out of the pte and querying
its size.

However, there are cases when the pte being set is actually a swap entry.
But this also used to work fine, because for huge ptes, we only ever saw
migration entries and hwpoison entries.  And both of these types of swap
entries have a PFN embedded, so the code would grab that and everything
still worked out.

But over time, more calls to set_huge_pte_at() have been added that set
swap entry types that do not embed a PFN.  And this causes the code to go
bang.  The triggering case is for the uffd poison test, commit
99aa77215ad0 ("selftests/mm: add uffd unit test for UFFDIO_POISON"), which
causes a PTE_MARKER_POISONED swap entry to be set, coutesey of commit
8a13897fb0da ("mm: userfaultfd: support UFFDIO_POISON for hugetlbfs") -
added in v6.5-rc7.  Although review shows that there are other call sites
that set PTE_MARKER_UFFD_WP (which also has no PFN), these don't trigger
on arm64 because arm64 doesn't support UFFD WP.

If CONFIG_DEBUG_VM is enabled, we do at least get a BUG(), but otherwise,
it will dereference a bad pointer in page_folio():

    static inline struct folio *hugetlb_swap_entry_to_folio(swp_entry_t entry)
    {
        VM_BUG_ON(!is_migration_entry(entry) && !is_hwpoison_entry(entry));

        return page_folio(pfn_to_page(swp_offset_pfn(entry)));
    }

Fix
===

The simplest fix would have been to revert the dodgy cleanup commit
18f3962953e4 ("mm: hugetlb: kill set_huge_swap_pte_at()"), but since
things have moved on, this would have required an audit of all the new
set_huge_pte_at() call sites to see if they should be converted to
set_huge_swap_pte_at().  As per the original intent of the change, it
would also leave us open to future bugs when people invariably get it
wrong and call the wrong helper.

So instead, I've added a huge page size parameter to set_huge_pte_at().
This means that the arm64 code has the size in all cases.  It's a bigger
change, due to needing to touch the arches that implement the function,
but it is entirely mechanical, so in my view, low risk.

I've compile-tested all touched arches; arm64, parisc, powerpc, riscv,
s390, sparc (and additionally x86_64).  I've additionally booted and run
mm selftests against arm64, where I observe the uffd poison test is fixed,
and there are no other regressions.

This patch (of 2):

In order to fix a bug, arm64 needs to be told the size of the huge page
for which the pte is being set in set_huge_pte_at().  Provide for this by
adding an `unsigned long sz` parameter to the function.  This follows the
same pattern as huge_pte_clear().

This commit makes the required interface modifications to the core mm as
well as all arches that implement this function (arm64, parisc, powerpc,
riscv, s390, sparc).  The actual arm64 bug will be fixed in a separate
commit.

No behavioral changes intended.

Link: https://lkml.kernel.org/r/20230922115804.2043771-1-ryan.roberts@arm.com
Link: https://lkml.kernel.org/r/20230922115804.2043771-2-ryan.roberts@arm.com
Fixes: 8a13897fb0da ("mm: userfaultfd: support UFFDIO_POISON for hugetlbfs")
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> [powerpc 8xx]
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> [vmalloc change]
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: <stable@vger.kernel.org> [6.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomaple_tree: add MAS_UNDERFLOW and MAS_OVERFLOW states
Liam R. Howlett [Thu, 21 Sep 2023 18:12:36 +0000 (14:12 -0400)]
maple_tree: add MAS_UNDERFLOW and MAS_OVERFLOW states

When updating the maple tree iterator to avoid rewalks, an issue was
introduced when shifting beyond the limits.  This can be seen by trying to
go to the previous address of 0, which would set the maple node to
MAS_NONE and keep the range as the last entry.

Subsequent calls to mas_find() would then search upwards from mas->last
and skip the value at mas->index/mas->last.  This showed up as a bug in
mprotect which skips the actual VMA at the current range after attempting
to go to the previous VMA from 0.

Since MAS_NONE may already be set when searching for a value that isn't
contained within a node, changing the handling of MAS_NONE in mas_find()
would make the code more complicated and error prone.  Furthermore, there
was no way to tell which limit was hit, and thus which action to take
(next or the entry at the current range).

This solution is to add two states to track what happened with the
previous iterator action.  This allows for the expected behaviour of the
next command to return the correct item (either the item at the range
requested, or the next/previous).

Tests are also added and updated accordingly.

Link: https://lkml.kernel.org/r/20230921181236.509072-3-Liam.Howlett@oracle.com
Link: https://gist.github.com/heatd/85d2971fae1501b55b6ea401fbbe485b
Link: https://lore.kernel.org/linux-mm/20230921181236.509072-1-Liam.Howlett@oracle.com/
Fixes: 39193685d585 ("maple_tree: try harder to keep active node with mas_prev()")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Pedro Falcato <pedro.falcato@gmail.com>
Closes: https://gist.github.com/heatd/85d2971fae1501b55b6ea401fbbe485b
Closes: https://bugs.archlinux.org/task/79656
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomaple_tree: add mas_is_active() to detect in-tree walks
Liam R. Howlett [Thu, 21 Sep 2023 18:12:35 +0000 (14:12 -0400)]
maple_tree: add mas_is_active() to detect in-tree walks

Patch series "maple_tree: Fix mas_prev() state regression".

Pedro Falcato retported an mprotect regression [1] which was bisected back
to the iterator changes for maple tree.  Root cause analysis showed the
mas_prev() running off the end of the VMA space (previous from 0) followed
by mas_find(), would skip the first value.

This patchset introduces maple state underflow/overflow so the sequence of
calls on the maple state will return what the user expects.

Users who encounter this bug may see mprotect(), userfaultfd_register(),
and mlock() fail on VMAs mapped with address 0.

This patch (of 2):

Instead of constantly checking each possibility of the maple state,
create a fast path that will skip over checking unlikely states.

Link: https://lkml.kernel.org/r/20230921181236.509072-1-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20230921181236.509072-2-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agonilfs2: fix potential use after free in nilfs_gccache_submit_read_data()
Pan Bian [Thu, 21 Sep 2023 14:17:31 +0000 (23:17 +0900)]
nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()

In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the
reference count of bh when the call to nilfs_dat_translate() fails.  If
the reference count hits 0 and its owner page gets unlocked, bh may be
freed.  However, bh->b_page is dereferenced to put the page after that,
which may result in a use-after-free bug.  This patch moves the release
operation after unlocking and putting the page.

NOTE: The function in question is only called in GC, and in combination
with current userland tools, address translation using DAT does not occur
in that function, so the code path that causes this issue will not be
executed.  However, it is possible to run that code path by intentionally
modifying the userland GC library or by calling the GC ioctl directly.

[konishi.ryusuke@gmail.com: NOTE added to the commit log]
Link: https://lkml.kernel.org/r/1543201709-53191-1-git-send-email-bianpan2016@163.com
Link: https://lkml.kernel.org/r/20230921141731.10073-1-konishi.ryusuke@gmail.com
Fixes: a3d93f709e89 ("nilfs2: block cache for garbage collection")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Reported-by: Ferry Meng <mengferry@linux.alibaba.com>
Closes: https://lkml.kernel.org/r/20230818092022.111054-1-mengferry@linux.alibaba.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: abstract moving to the next PFN
Matthew Wilcox (Oracle) [Wed, 20 Sep 2023 04:09:58 +0000 (05:09 +0100)]
mm: abstract moving to the next PFN

In order to fix the L1TF vulnerability, x86 can invert the PTE bits for
PROT_NONE VMAs, which means we cannot move from one PTE to the next by
adding 1 to the PFN field of the PTE.  This results in the BUG reported at
[1].

Abstract advancing the PTE to the next PFN through a pte_next_pfn()
function/macro.

Link: https://lkml.kernel.org/r/20230920040958.866520-1-willy@infradead.org
Fixes: bcc6cc832573 ("mm: add default definition of set_ptes()")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reported-by: syzbot+55cc72f8cc3a549119df@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/000000000000d099fa0604f03351@google.com [1]
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agomm: report success more often from filemap_map_folio_range()
Matthew Wilcox (Oracle) [Wed, 20 Sep 2023 03:53:35 +0000 (04:53 +0100)]
mm: report success more often from filemap_map_folio_range()

Even though we had successfully mapped the relevant page, we would rarely
return success from filemap_map_folio_range().  That leads to falling back
from the VMA lock path to the mmap_lock path, which is a speed &
scalability issue.  Found by inspection.

Link: https://lkml.kernel.org/r/20230920035336.854212-1-willy@infradead.org
Fixes: 617c28ecab22 ("filemap: batch PTE mappings")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agofs: binfmt_elf_efpic: fix personality for ELF-FDPIC
Greg Ungerer [Thu, 7 Sep 2023 01:18:08 +0000 (11:18 +1000)]
fs: binfmt_elf_efpic: fix personality for ELF-FDPIC

The elf-fdpic loader hard sets the process personality to either
PER_LINUX_FDPIC for true elf-fdpic binaries or to PER_LINUX for normal ELF
binaries (in this case they would be constant displacement compiled with
-pie for example).  The problem with that is that it will lose any other
bits that may be in the ELF header personality (such as the "bug
emulation" bits).

On the ARM architecture the ADDR_LIMIT_32BIT flag is used to signify a
normal 32bit binary - as opposed to a legacy 26bit address binary.  This
matters since start_thread() will set the ARM CPSR register as required
based on this flag.  If the elf-fdpic loader loses this bit the process
will be mis-configured and crash out pretty quickly.

Modify elf-fdpic loader personality setting so that it preserves the upper
three bytes by using the SET_PERSONALITY macro to set it.  This macro in
the generic case sets PER_LINUX and preserves the upper bytes.
Architectures can override this for their specific use case, and ARM does
exactly this.

The problem shows up quite easily running under qemu using the ARM
architecture, but not necessarily on all types of real ARM hardware.  If
the underlying ARM processor does not support the legacy 26-bit addressing
mode then everything will work as expected.

Link: https://lkml.kernel.org/r/20230907011808.2985083-1-gerg@kernel.org
Fixes: 1bde925d23547 ("fs/binfmt_elf_fdpic.c: provide NOMMU loader for regular ELF binaries")
Signed-off-by: Greg Ungerer <gerg@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg Ungerer <gerg@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 months agoMerge tag '6.6-rc3-ksmbd-server-fixes' of git://git.samba.org/ksmbd
Linus Torvalds [Fri, 29 Sep 2023 23:51:38 +0000 (16:51 -0700)]
Merge tag '6.6-rc3-ksmbd-server-fixes' of git://git.samba.org/ksmbd

Pull smb server fixes from Steve French:
 "Two SMB3 server fixes for null pointer dereferences:

   - invalid SMB3 request case (fixes issue found in testing the read
     compound patch)

   - iovec error case in response processing"

* tag '6.6-rc3-ksmbd-server-fixes' of git://git.samba.org/ksmbd:
  ksmbd: check iov vector index in ksmbd_conn_write()
  ksmbd: return invalid parameter error response if smb2 request is invalid

13 months agoMerge tag 'ceph-for-6.6-rc4' of https://github.com/ceph/ceph-client
Linus Torvalds [Fri, 29 Sep 2023 23:46:24 +0000 (16:46 -0700)]
Merge tag 'ceph-for-6.6-rc4' of https://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:
 "A series that fixes an involved 'double watch error' deadlock in RBD
  marked for stable and two cleanups"

* tag 'ceph-for-6.6-rc4' of https://github.com/ceph/ceph-client:
  rbd: take header_rwsem in rbd_dev_refresh() only when updating
  rbd: decouple parent info read-in from updating rbd_dev
  rbd: decouple header read-in from updating rbd_dev->header
  rbd: move rbd_dev_refresh() definition
  Revert "ceph: make members in struct ceph_mds_request_args_ext a union"
  ceph: remove unnecessary check for NULL in parse_longname()

13 months agoMerge tag 'xfs-6.6-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Linus Torvalds [Fri, 29 Sep 2023 23:41:25 +0000 (16:41 -0700)]
Merge tag 'xfs-6.6-fixes-2' of git://git./fs/xfs/xfs-linux

Pull xfs fix from Chandan Babu:

 - fix for commit 68b957f64fca ("xfs: load uncached unlinked inodes into
   memory on demand") which address review comments provided by Dave
   Chinner

* tag 'xfs-6.6-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: fix reloading entire unlinked bucket lists

13 months agoMAINTAINERS: Fix Florian Fainelli's email address
Uwe Kleine-König [Thu, 28 Sep 2023 07:06:52 +0000 (09:06 +0200)]
MAINTAINERS: Fix Florian Fainelli's email address

Commit 31345a0f5901 ("MAINTAINERS: Replace my email address") added 13
instances of ...@broadcom.com and one of only ...@broadcom. I didn't
double check if Broadcom really owns that TLD, but git send-email
doesn't accept it, so add ".com" to that one bogous(?) instance.

Fixes: 31345a0f5901 ("MAINTAINERS: Replace my email address")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
13 months agoMerge tag 'ata-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal...
Linus Torvalds [Fri, 29 Sep 2023 20:38:34 +0000 (13:38 -0700)]
Merge tag 'ata-6.6-rc4' of git://git./linux/kernel/git/dlemoal/libata

Pull ATA fixes from Damien Le Moal:
 "A larger than usual set of fixes for 6.6-rc4 due to the unexpected
  number of fixes needed to address ATA disks suspend/resume issues.

  In more detail:

   - Add missing additionalProperties on child nodes to the pata-common
     DT bindings (Rob)

   - Fix handling of the REPORT SUPPORTED OPERATION CODES command to
     ignore reserved bits (Niklas)

   - Increase port multiplier soft reset timeout to accomodate slow
     devices and avoid issues on wakeup (Matthias)

   - A couple of minor code fixes to avoid compilation warnings in
     libata-core and libata-eh (me)

   - Many patches from me to address suspend/resume issues, and in
     particular a potential deadlock on resume due to the SCSI disk
     driver resume operation not being synchronized with libata EH port
     resume handling.

     This is addressed by changing the scsi disk driver disk start/stop
     control to allow libata to execute disk suspend (spin down) and
     resume (spin up) on its own during system suspend/resume. Runtime
     suspend/resume control remains with the SCSI disk driver.

     Other fixes include:
      - Fix libata power management request issuing to avoid races
      - Establish a link between ATA ports and SCSI devices to order PM
        operations
      - Fix device removal to avoid issues with driver rmmod removal
      - Fix synchronization of libata device rescan and SCSI disk resume
        operation
      - Remove libsas PM operations as suspend/resume is handled
        directly by the sas controller resume
      - Fix the SCSI disk driver to not issue commands to suspended
        disks, thus avoiding potential system lock-up on resume"

* tag 'ata-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
  ata: libata-eh: Fix compilation warning in ata_eh_link_report()
  ata: libata-core: Fix compilation warning in ata_dev_config_ncq()
  scsi: sd: Do not issue commands to suspended disks on shutdown
  ata: libata-core: Do not register PM operations for SAS ports
  ata: libata-scsi: Fix delayed scsi_rescan_device() execution
  scsi: Do not attempt to rescan suspended devices
  ata: libata-scsi: Disable scsi device manage_system_start_stop
  scsi: sd: Differentiate system and runtime start/stop management
  ata: libata-scsi: link ata port and scsi device
  ata: libata-core: Fix port and device removal
  ata: libata-core: Fix ata_port_request_pm() locking
  ata: libata-sata: increase PMP SRST timeout to 10s
  ata: libata-scsi: ignore reserved bits for REPORT SUPPORTED OPERATION CODES
  dt-bindings: ata: pata-common: Add missing additionalProperties on child nodes

13 months agoMerge tag 'block-6.6-2023-09-28' of git://git.kernel.dk/linux
Linus Torvalds [Fri, 29 Sep 2023 20:28:49 +0000 (13:28 -0700)]
Merge tag 'block-6.6-2023-09-28' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:
 "Just two minor comment / documentation fixes for the block side"

* tag 'block-6.6-2023-09-28' of git://git.kernel.dk/linux:
  block: fix kernel-doc for disk_force_media_change()
  block: correct stale comment in rq_qos_wait

13 months agoMerge tag 'io_uring-6.6-2023-09-28' of git://git.kernel.dk/linux
Linus Torvalds [Fri, 29 Sep 2023 19:56:34 +0000 (12:56 -0700)]
Merge tag 'io_uring-6.6-2023-09-28' of git://git.kernel.dk/linux

Pull io_uring fix from Jens Axboe:
 "A single fix going to stable for the IORING_OP_LINKAT flag handling"

* tag 'io_uring-6.6-2023-09-28' of git://git.kernel.dk/linux:
  io_uring/fs: remove sqe->rw_flags checking from LINKAT

13 months agoMerge tag 'slab-fixes-for-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 29 Sep 2023 19:10:12 +0000 (12:10 -0700)]
Merge tag 'slab-fixes-for-6.6-rc4' of git://git./linux/kernel/git/vbabka/slab

Pull slab fixes from Vlastimil Babka:

 - stable fix to prevent list corruption when destroying caches with
   leftover objects (Rafael Aquini)

 - fix for a gotcha in kmalloc_size_roundup() when calling it with too
   high size, discovered when recently a networking call site had to be
   fixed for a different issue (David Laight)

* tag 'slab-fixes-for-6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  slab: kmalloc_size_roundup() must not return 0 for non-zero size
  mm/slab_common: fix slab_caches list corruption after kmem_cache_destroy()

13 months agoMerge tag 'drm-fixes-2023-09-29' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 29 Sep 2023 17:24:49 +0000 (10:24 -0700)]
Merge tag 'drm-fixes-2023-09-29' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Regular pull, this feel suspiciously light so I expect next week might
  be a bit heavier? Let's see how we go. This is from a code point of
  view ivpu and i915 fixes.

  The only other patch is adding Danilo Krummrich to the nouveau
  maintainers, he's agreed to take on more of the roll after Ben
  retired.

  MAINTAINERS:
   - add Danilo for nouveau

  ivpu:
   - Add PCI ids for Arrow Lake
   - Fix memory corruption during IPC
   - Avoid dmesg flooding
   - 40xx: Wait for clock resource
   - 40xx: Fix interrupt usage
   - 40xx: Support caching when loading firmware

  i915:
   - Fix a panic regression on gen8_ggtt_insert_entries
   - Fix load issue due to reservation address in ggtt_reserve_guc_top
   - Fix a possible deadlock with guc busyness worker"

* tag 'drm-fixes-2023-09-29' of git://anongit.freedesktop.org/drm/drm:
  accel/ivpu: Use cached buffers for FW loading
  accel/ivpu/40xx: Fix missing VPUIP interrupts
  accel/ivpu/40xx: Disable frequency change interrupt
  accel/ivpu/40xx: Ensure clock resource ownership Ack before Power-Up
  accel/ivpu: Don't flood dmesg with VPU ready message
  accel/ivpu: Do not use wait event interruptible
  MAINTAINERS: update nouveau maintainers
  i915/guc: Get runtime pm in busyness worker only if already active
  drm/i915/gt: Fix reservation address in ggtt_reserve_guc_top
  i915: Limit the length of an sg list to the requested length
  accel/ivpu: Add Arrow Lake pci id

13 months agoMerge tag 'gpio-fixes-for-v6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 29 Sep 2023 16:25:23 +0000 (09:25 -0700)]
Merge tag 'gpio-fixes-for-v6.6-rc4' of git://git./linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:

 - fix a potential spinlock deadlock in gpio-timberdale

 - mark the gpio-pmic-eic-sprd driver as one that can sleep

* tag 'gpio-fixes-for-v6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpio: pmic-eic-sprd: Add can_sleep flag for PMIC EIC chip
  gpio: timberdale: Fix potential deadlock on &tgpio->lock

13 months agoMerge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 29 Sep 2023 15:55:21 +0000 (08:55 -0700)]
Merge tag 'clk-fixes-for-linus' of git://git./linux/kernel/git/clk/linux

Pull clk fixes from Stephen Boyd:
 "A bunch of clk driver fixes for issues found recently:

   - Fix the binding for versaclock3 that was introduced this merge
     window so we know what the values are for clk consumers

   - Fix a 64-bit division issue in the versaclock3 driver

   - Avoid breakage in the versaclock3 driver by rejiggering the enums
     used to layout clks

   - Fix the parent name of a clk in the Spreadtrum ums512 clk driver

   - Fix a suspend/resume issue in Skyworks Si521xx clk driver where
     regmap restoration fails because writes are wedged

   - Return zero from Tegra bpmp recalc_rate() implementation when an
     error occurs so we don't consider an error as a large rate"

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: tegra: fix error return case for recalc_rate
  clk: si521xx: Fix regmap write accessor
  clk: si521xx: Use REGCACHE_FLAT instead of NONE
  clk: sprd: Fix thm_parents incorrect configuration
  clk: vc3: Make vc3_clk_mux enum values based on vc3_clk enum values
  clk: vc3: Fix output clock mapping
  clk: vc3: Fix 64 by 64 division
  dt-bindings: clock: versaclock3: Add description for #clock-cells property

13 months agoMerge tag 'for-v6.6-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux...
Linus Torvalds [Fri, 29 Sep 2023 15:51:57 +0000 (08:51 -0700)]
Merge tag 'for-v6.6-rc' of git://git./linux/kernel/git/sre/linux-power-supply

Pull power supply fixes from Sebastian Reichel:

 - core: fix use after free during device release

 - ab8500: avoid reporting multiple batteries to userspace

 - rk817: fix DT node resource leak

 - misc. small fixes, mostly for compiler warnings/errors

* tag 'for-v6.6-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
  power: supply: rk817: Fix node refcount leak
  power: supply: core: fix use after free in uevent
  power: supply: rt9467: Fix rt9467_run_aicl()
  power: supply: rk817: Add missing module alias
  power: supply: ucs1002: fix error code in ucs1002_get_property()
  power: vexpress: fix -Wvoid-pointer-to-enum-cast warning
  power: reset: use capital "OR" for multiple licenses in SPDX
  pwr-mlxbf: extend Kconfig to include gpio-mlxbf3 dependency
  power: supply: rt5033_charger: recognize EXTCON setting
  power: supply: mt6370: Fix missing error code in mt6370_chg_toggle_cfo()
  power: supply: ab8500: Set typing and props

13 months agoMerge tag 'xtensa-20230928' of https://github.com/jcmvbkbc/linux-xtensa
Linus Torvalds [Fri, 29 Sep 2023 15:41:56 +0000 (08:41 -0700)]
Merge tag 'xtensa-20230928' of https://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa fixes from Max Filippov:

 - fix build warnings from builds performed with W=1

* tag 'xtensa-20230928' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: boot/lib: fix function prototypes
  xtensa: umulsidi3: fix conditional expression
  xtensa: boot: don't add include-dirs
  xtensa: iss/network: make functions static
  xtensa: tlb: include <asm/tlb.h> for missing prototype
  xtensa: hw_breakpoint: include header for missing prototype
  xtensa: smp: add headers for missing function prototypes
  irqchip: irq-xtensa-mx: include header for missing prototype
  xtensa: traps: add <linux/cpu.h> for function prototype
  xtensa: stacktrace: include <asm/ftrace.h> for prototype
  xtensa: signal: include headers for function prototypes
  xtensa: processor.h: add init_arch() prototype
  xtensa: ptrace: add prototypes to <asm/ptrace.h>
  xtensa: irq: include <asm/traps.h>
  xtensa: fault: include <asm/traps.h>
  xtensa: add default definition for XCHAL_HAVE_DIV32

13 months agoio_uring/fs: remove sqe->rw_flags checking from LINKAT
Jens Axboe [Thu, 28 Sep 2023 15:23:27 +0000 (09:23 -0600)]
io_uring/fs: remove sqe->rw_flags checking from LINKAT

This is unionized with the actual link flags, so they can of course be
set and they will be evaluated further down. If not we fail any LINKAT
that has to set option flags.

Fixes: cf30da90bc3a ("io_uring: add support for IORING_OP_LINKAT")
Cc: stable@vger.kernel.org
Reported-by: Thomas Leonard <talex5@gmail.com>
Link: https://github.com/axboe/liburing/issues/955
Signed-off-by: Jens Axboe <axboe@kernel.dk>
13 months agoMerge tag 'drm-intel-fixes-2023-09-28' of git://anongit.freedesktop.org/drm/drm-intel...
Dave Airlie [Fri, 29 Sep 2023 00:28:07 +0000 (10:28 +1000)]
Merge tag 'drm-intel-fixes-2023-09-28' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Fix a panic regression on gen8_ggtt_insert_entries (Matthew Wilcox)
- Fix load issue due to reservation address in ggtt_reserve_guc_top (Javier Pello)
- Fix a possible deadlock with guc busyness worker (Umesh)

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ZRWMI1HmUYPGGylp@intel.com
13 months agox86/sgx: Resolves SECS reclaim vs. page fault for EAUG race
Haitao Huang [Fri, 28 Jul 2023 05:10:24 +0000 (22:10 -0700)]
x86/sgx: Resolves SECS reclaim vs. page fault for EAUG race

The SGX EPC reclaimer (ksgxd) may reclaim the SECS EPC page for an
enclave and set secs.epc_page to NULL. The SECS page is used for EAUG
and ELDU in the SGX page fault handler. However, the NULL check for
secs.epc_page is only done for ELDU, not EAUG before being used.

Fix this by doing the same NULL check and reloading of the SECS page as
needed for both EAUG and ELDU.

The SECS page holds global enclave metadata. It can only be reclaimed
when there are no other enclave pages remaining. At that point,
virtually nothing can be done with the enclave until the SECS page is
paged back in.

An enclave can not run nor generate page faults without a resident SECS
page. But it is still possible for a #PF for a non-SECS page to race
with paging out the SECS page: when the last resident non-SECS page A
triggers a #PF in a non-resident page B, and then page A and the SECS
both are paged out before the #PF on B is handled.

Hitting this bug requires that race triggered with a #PF for EAUG.
Following is a trace when it happens.

BUG: kernel NULL pointer dereference, address: 0000000000000000
RIP: 0010:sgx_encl_eaug_page+0xc7/0x210
Call Trace:
 ? __kmem_cache_alloc_node+0x16a/0x440
 ? xa_load+0x6e/0xa0
 sgx_vma_fault+0x119/0x230
 __do_fault+0x36/0x140
 do_fault+0x12f/0x400
 __handle_mm_fault+0x728/0x1110
 handle_mm_fault+0x105/0x310
 do_user_addr_fault+0x1ee/0x750
 ? __this_cpu_preempt_check+0x13/0x20
 exc_page_fault+0x76/0x180
 asm_exc_page_fault+0x27/0x30

Fixes: 5a90d2c3f5ef ("x86/sgx: Support adding of pages to an initialized enclave")
Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20230728051024.33063-1-haitao.huang%40linux.intel.com
13 months agoMerge tag 'drm-misc-fixes-2023-09-28' of git://anongit.freedesktop.org/drm/drm-misc...
Dave Airlie [Thu, 28 Sep 2023 21:50:11 +0000 (07:50 +1000)]
Merge tag 'drm-misc-fixes-2023-09-28' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

Short summary of fixes pull:

 * ivpu:
   * Add PCI ids for Arrow Lake
   * Fix memory corruption during IPC
   * Avoid dmesg flooding
   * 40xx: Wait for clock resource
   * 40xx: Fix interrupt usage
   * 40xx: Support caching when loading firmware

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230928081208.GA7881@linux-uq9g
13 months agosched/rt: Fix live lock between select_fallback_rq() and RT push
Joel Fernandes (Google) [Sat, 23 Sep 2023 01:14:08 +0000 (01:14 +0000)]
sched/rt: Fix live lock between select_fallback_rq() and RT push

During RCU-boost testing with the TREE03 rcutorture config, I found that
after a few hours, the machine locks up.

On tracing, I found that there is a live lock happening between 2 CPUs.
One CPU has an RT task running, while another CPU is being offlined
which also has an RT task running.  During this offlining, all threads
are migrated. The migration thread is repeatedly scheduled to migrate
actively running tasks on the CPU being offlined. This results in a live
lock because select_fallback_rq() keeps picking the CPU that an RT task
is already running on only to get pushed back to the CPU being offlined.

It is anyway pointless to pick CPUs for pushing tasks to if they are
being offlined only to get migrated away to somewhere else. This could
also add unwanted latency to this task.

Fix these issues by not selecting CPUs in RT if they are not 'active'
for scheduling, using the cpu_active_mask. Other parts in core.c already
use cpu_active_mask to prevent tasks from being put on CPUs going
offline.

With this fix I ran the tests for days and could not reproduce the
hang. Without the patch, I hit it in a few hours.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230923011409.3522762-1-joel@joelfernandes.org
13 months agofs/smb/client: Reset password pointer to NULL
Quang Le [Thu, 28 Sep 2023 17:44:13 +0000 (00:44 +0700)]
fs/smb/client: Reset password pointer to NULL

Forget to reset ctx->password to NULL will lead to bug like double free

Cc: stable@vger.kernel.org
Cc: Willy Tarreau <w@1wt.eu>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Quang Le <quanglex97@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
13 months agoMerge tag 'spi-fix-v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Linus Torvalds [Thu, 28 Sep 2023 18:12:42 +0000 (11:12 -0700)]
Merge tag 'spi-fix-v6.6-rc3' of git://git./linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "A small set of device specific fixes, the most major one is for the
  GXP driver which would probably have been confusing some callers with
  returning the length rather than 0 on successful writes"

* tag 'spi-fix-v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: spi-gxp: BUG: Correct spi write return value
  dt-bindings: spi: fsl-imx-cspi: Document missing entries
  spi: cs42l43: Remove spurious pm_runtime_disable

13 months agoMerge tag 'loongarch-fixes-6.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 28 Sep 2023 17:27:45 +0000 (10:27 -0700)]
Merge tag 'loongarch-fixes-6.6-2' of git://git./linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch fixes from Huacai Chen:
 "Fix high_memory calculation and module loader errors with latest
  binutils"

* tag 'loongarch-fixes-6.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  LoongArch: Add support for 64_PCREL relocation type
  LoongArch: Add support for 32_PCREL relocation type
  LoongArch: Define relocation types for ABI v2.10
  LoongArch: numa: Fix high_memory calculation

13 months agoMerge tag 'mips-fixes_6.6_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips...
Linus Torvalds [Thu, 28 Sep 2023 17:24:26 +0000 (10:24 -0700)]
Merge tag 'mips-fixes_6.6_1' of git://git./linux/kernel/git/mips/linux

Pull MIPS fix from Thomas Bogendoerfer:

 - fix Alchemy build with MMC support disabled

* tag 'mips-fixes_6.6_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: Alchemy: only build mmc support helpers if au1xmmc is enabled

13 months agoiomap: Spelling s/preceeding/preceding/g
Geert Uytterhoeven [Thu, 28 Sep 2023 16:26:58 +0000 (09:26 -0700)]
iomap: Spelling s/preceeding/preceding/g

Fix a misspelling of "preceding".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
13 months agoNFSD: Fix zero NFSv4 READ results when RQ_SPLICE_OK is not set
Chuck Lever [Wed, 27 Sep 2023 17:16:48 +0000 (13:16 -0400)]
NFSD: Fix zero NFSv4 READ results when RQ_SPLICE_OK is not set

nfsd4_encode_readv() uses xdr->buf->page_len as a starting point for
the nfsd_iter_read() sink buffer -- page_len is going to be offset
by the parts of the COMPOUND that have already been encoded into
xdr->buf->pages.

However, that value must be captured /before/
xdr_reserve_space_vec() advances page_len by the expected size of
the read payload. Otherwise, the whole front part of the first
page of the payload in the reply will be uninitialized.

Mantas hit this because sec=krb5i forces RQ_SPLICE_OK off, which
invokes the readv part of the nfsd4_encode_read() path. Also,
older Linux NFS clients appear to send shorter READ requests
for files smaller than a page, whereas newer clients just send
page-sized requests and let the server send as many bytes as
are in the file.

Reported-by: Mantas Mikulėnas <grawity@gmail.com>
Closes: https://lore.kernel.org/linux-nfs/f1d0b234-e650-0f6e-0f5d-126b3d51d1eb@gmail.com/
Fixes: 703d75215555 ("NFSD: Hoist rq_vec preparation into nfsd_read() [step two]")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
13 months agoata: libata-eh: Fix compilation warning in ata_eh_link_report()
Damien Le Moal [Tue, 12 Sep 2023 00:08:40 +0000 (09:08 +0900)]
ata: libata-eh: Fix compilation warning in ata_eh_link_report()

The 6 bytes length of the tries_buf string in ata_eh_link_report() is
too short and results in a gcc compilation warning with W-!:

drivers/ata/libata-eh.c: In function ‘ata_eh_link_report’:
drivers/ata/libata-eh.c:2371:59: warning: ‘%d’ directive output may be truncated writing between 1 and 11 bytes into a region of size 4 [-Wformat-truncation=]
 2371 |                 snprintf(tries_buf, sizeof(tries_buf), " t%d",
      |                                                           ^~
drivers/ata/libata-eh.c:2371:56: note: directive argument in the range [-2147483648, 4]
 2371 |                 snprintf(tries_buf, sizeof(tries_buf), " t%d",
      |                                                        ^~~~~~
drivers/ata/libata-eh.c:2371:17: note: ‘snprintf’ output between 4 and 14 bytes into a destination of size 6
 2371 |                 snprintf(tries_buf, sizeof(tries_buf), " t%d",
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2372 |                          ap->eh_tries);
      |                          ~~~~~~~~~~~~~

Avoid this warning by increasing the string size to 16B.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
13 months agoata: libata-core: Fix compilation warning in ata_dev_config_ncq()
Damien Le Moal [Mon, 11 Sep 2023 23:46:22 +0000 (08:46 +0900)]
ata: libata-core: Fix compilation warning in ata_dev_config_ncq()

The 24 bytes length allocated to the ncq_desc string in
ata_dev_config_lba() for ata_dev_config_ncq() to use is too short,
causing the following gcc compilation warnings when compiling with W=1:

drivers/ata/libata-core.c: In function ‘ata_dev_configure’:
drivers/ata/libata-core.c:2378:56: warning: ‘%d’ directive output may be truncated writing between 1 and 2 bytes into a region of size between 1 and 11 [-Wformat-truncation=]
 2378 |                 snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
      |                                                        ^~
In function ‘ata_dev_config_ncq’,
    inlined from ‘ata_dev_config_lba’ at drivers/ata/libata-core.c:2649:8,
    inlined from ‘ata_dev_configure’ at drivers/ata/libata-core.c:2952:9:
drivers/ata/libata-core.c:2378:41: note: directive argument in the range [1, 32]
 2378 |                 snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
      |                                         ^~~~~~~~~~~~~~~~~~~~~
drivers/ata/libata-core.c:2378:17: note: ‘snprintf’ output between 16 and 31 bytes into a destination of size 24
 2378 |                 snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2379 |                         ddepth, aa_desc);
      |                         ~~~~~~~~~~~~~~~~

Avoid these warnings and the potential truncation by changing the size
of the ncq_desc string to 32 characters.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
13 months agoscsi: sd: Do not issue commands to suspended disks on shutdown
Damien Le Moal [Fri, 8 Sep 2023 08:03:15 +0000 (17:03 +0900)]
scsi: sd: Do not issue commands to suspended disks on shutdown

If an error occurs when resuming a host adapter before the devices
attached to the adapter are resumed, the adapter low level driver may
remove the scsi host, resulting in a call to sd_remove() for the
disks of the host. This in turn results in a call to sd_shutdown() which
will issue a synchronize cache command and a start stop unit command to
spindown the disk. sd_shutdown() issues the commands only if the device
is not already runtime suspended but does not check the power state for
system-wide suspend/resume. That is, the commands may be issued with the
device in a suspended state, which causes PM resume to hang, forcing a
reset of the machine to recover.

Fix this by tracking the suspended state of a disk by introducing the
suspended boolean field in the scsi_disk structure. This flag is set to
true when the disk is suspended is sd_suspend_common() and resumed with
sd_resume(). When suspended is true, sd_shutdown() is not executed from
sd_remove().

Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
13 months agoata: libata-core: Do not register PM operations for SAS ports
Damien Le Moal [Fri, 8 Sep 2023 11:04:52 +0000 (20:04 +0900)]
ata: libata-core: Do not register PM operations for SAS ports

libsas does its own domain based power management of ports. For such
ports, libata should not use a device type defining power management
operations as executing these operations for suspend/resume in addition
to libsas calls to ata_sas_port_suspend() and ata_sas_port_resume() is
not necessary (and likely dangerous to do, even though problems are not
seen currently).

Introduce the new ata_port_sas_type device_type for ports managed by
libsas. This new device type is used in ata_tport_add() and is defined
without power management operations.

Fixes: 2fcbdcb4c802 ("[SCSI] libata: export ata_port suspend/resume infrastructure for sas")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Tested-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>