linux-2.6-microblaze.git
6 years agoMerge tag 'for-linus-4.16a-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 17 Feb 2018 17:16:09 +0000 (09:16 -0800)]
Merge tag 'for-linus-4.16a-rc2-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:

 - fixes for the Xen pvcalls frontend driver

 - fix for booting Xen pv domains

 - fix for the xenbus driver user interface

* tag 'for-linus-4.16a-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  pvcalls-front: wait for other operations to return when release passive sockets
  pvcalls-front: introduce a per sock_mapping refcount
  x86/xen: Calculate __max_logical_packages on PV domains
  xenbus: track caller request id

6 years agopvcalls-front: wait for other operations to return when release passive sockets
Stefano Stabellini [Wed, 14 Feb 2018 18:28:24 +0000 (10:28 -0800)]
pvcalls-front: wait for other operations to return when release passive sockets

Passive sockets can have ongoing operations on them, specifically, we
have two wait_event_interruptable calls in pvcalls_front_accept.

Add two wake_up calls in pvcalls_front_release, then wait for the
potential waiters to return and release the sock_mapping refcount.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Acked-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
6 years agopvcalls-front: introduce a per sock_mapping refcount
Stefano Stabellini [Wed, 14 Feb 2018 18:28:23 +0000 (10:28 -0800)]
pvcalls-front: introduce a per sock_mapping refcount

Introduce a per sock_mapping refcount, in addition to the existing
global refcount. Thanks to the sock_mapping refcount, we can safely wait
for it to be 1 in pvcalls_front_release before freeing an active socket,
instead of waiting for the global refcount to be 1.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Acked-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
6 years agox86/xen: Calculate __max_logical_packages on PV domains
Prarit Bhargava [Wed, 7 Feb 2018 23:49:23 +0000 (18:49 -0500)]
x86/xen: Calculate __max_logical_packages on PV domains

The kernel panics on PV domains because native_smp_cpus_done() is
only called for HVM domains.

Calculate __max_logical_packages for PV domains.

Fixes: b4c0a7326f5d ("x86/smpboot: Fix __max_logical_packages estimate")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Tested-and-reported-by: Simon Gaiser <simon@invisiblethingslab.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: xen-devel@lists.xenproject.org
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
6 years agoxenbus: track caller request id
Joao Martins [Fri, 2 Feb 2018 17:42:33 +0000 (17:42 +0000)]
xenbus: track caller request id

Commit fd8aa9095a95 ("xen: optimize xenbus driver for multiple concurrent
xenstore accesses") optimized xenbus concurrent accesses but in doing so
broke UABI of /dev/xen/xenbus. Through /dev/xen/xenbus applications are in
charge of xenbus message exchange with the correct header and body. Now,
after the mentioned commit the replies received by application will no
longer have the header req_id echoed back as it was on request (see
specification below for reference), because that particular field is being
overwritten by kernel.

struct xsd_sockmsg
{
  uint32_t type;  /* XS_??? */
  uint32_t req_id;/* Request identifier, echoed in daemon's response.  */
  uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */
  uint32_t len;   /* Length of data following this. */

  /* Generally followed by nul-terminated string(s). */
};

Before there was only one request at a time so req_id could simply be
forwarded back and forth. To allow simultaneous requests we need a
different req_id for each message thus kernel keeps a monotonic increasing
counter for this field and is written on every request irrespective of
userspace value.

Forwarding again the req_id on userspace requests is not a solution because
we would open the possibility of userspace-generated req_id colliding with
kernel ones. So this patch instead takes another route which is to
artificially keep user req_id while keeping the xenbus logic as is. We do
that by saving the original req_id before xs_send(), use the private kernel
counter as req_id and then once reply comes and was validated, we restore
back the original req_id.

Cc: <stable@vger.kernel.org> # 4.11
Fixes: fd8aa9095a ("xen: optimize xenbus driver for multiple concurrent xenstore accesses")
Reported-by: Bhavesh Davda <bhavesh.davda@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
6 years agoMerge tag 'dma-mapping-4.16-2' of git://git.infradead.org/users/hch/dma-mapping
Linus Torvalds [Fri, 16 Feb 2018 20:22:33 +0000 (12:22 -0800)]
Merge tag 'dma-mapping-4.16-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "A few dma-mapping fixes for the fallout from the changes in rc1"

* tag 'dma-mapping-4.16-2' of git://git.infradead.org/users/hch/dma-mapping:
  powerpc/macio: set a proper dma_coherent_mask
  dma-mapping: fix a comment typo
  dma-direct: comment the dma_direct_free calling convention
  dma-direct: mark as is_phys
  ia64: fix build failure with CONFIG_SWIOTLB

6 years agomm: hide a #warning for COMPILE_TEST
Arnd Bergmann [Fri, 16 Feb 2018 15:25:53 +0000 (16:25 +0100)]
mm: hide a #warning for COMPILE_TEST

We get a warning about some slow configurations in randconfig kernels:

  mm/memory.c:83:2: error: #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid. [-Werror=cpp]

The warning is reasonable by itself, but gets in the way of randconfig
build testing, so I'm hiding it whenever CONFIG_COMPILE_TEST is set.

The warning was added in 2013 in commit 75980e97dacc ("mm: fold
page->_last_nid into page->flags where possible").

Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoMerge tag 'mips_fixes_4.16_2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan...
Linus Torvalds [Fri, 16 Feb 2018 17:31:37 +0000 (09:31 -0800)]
Merge tag 'mips_fixes_4.16_2' of git://git./linux/kernel/git/jhogan/mips

Pull MIPS fixes from James Hogan:
 "A few fixes for outstanding MIPS issues:

   - an __init section mismatch warning when brcmstb_pm is enabled

   - a regression handling multiple mem=X@Y arguments (4.11)

   - a USB Kconfig select warning, and related sparc cleanup (4.16)"

* tag 'mips_fixes_4.16_2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips:
  sparc,leon: Select USB_UHCI_BIG_ENDIAN_{MMIO,DESC}
  usb: Move USB_UHCI_BIG_ENDIAN_* out of USB_SUPPORT
  MIPS: Fix incorrect mem=X@Y handling
  MIPS: BMIPS: Fix section mismatch warning

6 years agoMerge tag 'for-4.16-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
Linus Torvalds [Fri, 16 Feb 2018 17:26:18 +0000 (09:26 -0800)]
Merge tag 'for-4.16-rc1-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "We have a few assorted fixes, some of them show up during fstests so I
  gave them more testing"

* tag 'for-4.16-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: Fix use-after-free when cleaning up fs_devs with a single stale device
  Btrfs: fix null pointer dereference when replacing missing device
  btrfs: remove spurious WARN_ON(ref->count < 0) in find_parent_nodes
  btrfs: Ignore errors from btrfs_qgroup_trace_extent_post
  Btrfs: fix unexpected -EEXIST when creating new inode
  Btrfs: fix use-after-free on root->orphan_block_rsv
  Btrfs: fix btrfs_evict_inode to handle abnormal inodes correctly
  Btrfs: fix extent state leak from tree log
  Btrfs: fix crash due to not cleaning up tree log block's dirty bits
  Btrfs: fix deadlock in run_delalloc_nocow

6 years agoMerge tag 'for-4.16/dm-chained-bios-fix' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 16 Feb 2018 17:23:36 +0000 (09:23 -0800)]
Merge tag 'for-4.16/dm-chained-bios-fix' of git://git./linux/kernel/git/device-mapper/linux-dm

Pull device mapper fix from Mike Snitzer:
 "Fix for DM core to properly propagate errors (avoids overriding
  non-zero error with 0). This is particularly important given DM core's
  increased use of chained bios"

* tag 'for-4.16/dm-chained-bios-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: correctly handle chained bios in dec_pending()

6 years agoMerge tag 'platform-drivers-x86-v4.16-4' of git://git.infradead.org/linux-platform...
Linus Torvalds [Fri, 16 Feb 2018 17:20:00 +0000 (09:20 -0800)]
Merge tag 'platform-drivers-x86-v4.16-4' of git://git.infradead.org/linux-platform-drivers-x86

Pull x86 platform driver fixes from Andy Shevchenko:

 - regression fix in keyboard support for Dell laptops

 - prevent out-of-boundary write in WMI bus driver

 - increase timeout to read functional key status on Lenovo laptops

* tag 'platform-drivers-x86-v4.16-4' of git://git.infradead.org/linux-platform-drivers-x86:
  platform/x86: dell-laptop: Removed duplicates in DMI whitelist
  platform/x86: dell-laptop: fix kbd_get_state's request value
  platform/x86: ideapad-laptop: Increase timeout to wait for EC answer
  platform/x86: wmi: fix off-by-one write in wmi_dev_probe()

6 years agoMerge tag 'sound-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 16 Feb 2018 17:11:30 +0000 (09:11 -0800)]
Merge tag 'sound-4.16-rc2' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "A collection of usual suspects:

   - a handful USB-audio and HD-audio device-specific quirks

   - some trivial fixes for the new AC97 bus stuff

   - another race fix in ALSA sequencer core"

* tag 'sound-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda/realtek: PCI quirk for Fujitsu U7x7
  ALSA: seq: Fix racy pool initializations
  ALSA: usb: add more device quirks for USB DSD devices
  ALSA: usb-audio: Fix UAC2 get_ctl request with a RANGE attribute
  ALSA: ac97: Fix copy and paste typo in documentation
  ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204
  ALSA: ac97: kconfig: Remove select of undefined symbol AC97
  ALSA: hda/realtek - Enable Thinkpad Dock device for ALC298 platform
  ALSA: hda/realtek - Add headset mode support for Dell laptop
  ALSA: hda - Fix headset mic detection problem for two Dell machines

6 years agoMerge tag 'drm-fixes-for-v4.16-rc2' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Fri, 16 Feb 2018 17:08:59 +0000 (09:08 -0800)]
Merge tag 'drm-fixes-for-v4.16-rc2' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "One nouveau regression fix, one AMD quirk and a full set of i915
  fixes.

  The i915 fixes are mostly for things caught by their CI system, main
  ones being DSI panel fixes and GEM fixes"

* tag 'drm-fixes-for-v4.16-rc2' of git://people.freedesktop.org/~airlied/linux:
  drm/nouveau: Make clock gate support conditional
  drm/i915: Fix DSI panels with v1 MIPI sequences without a DEASSERT sequence v3
  drm/i915: Free memdup-ed DSI VBT data structures on driver_unload
  drm/i915: Add intel_bios_cleanup() function
  drm/i915/vlv: Add cdclk workaround for DSI
  drm/i915/gvt: fix one typo of render_mmio trace
  drm/i915/gvt: Support BAR0 8-byte reads/writes
  drm/i915/gvt: add 0xe4f0 into gen9 render list
  drm/i915/pmu: Fix building without CONFIG_PM
  drm/i915/pmu: Fix sleep under atomic in RC6 readout
  drm/i915/pmu: Fix PMU enable vs execlists tasklet race
  drm/i915: Lock out execlist tasklet while peeking inside for busy-stats
  drm/i915/breadcrumbs: Ignore unsubmitted signalers
  drm/i915: Don't wake the device up to check if the engine is asleep
  drm/i915: Avoid truncation before clamping userspace's priority value
  drm/i915/perf: Fix compiler warning for string truncation
  drm/i915/perf: Fix compiler warning for string truncation
  drm/amdgpu: add new device to use atpx quirk

6 years agodm: correctly handle chained bios in dec_pending()
NeilBrown [Thu, 15 Feb 2018 09:00:15 +0000 (20:00 +1100)]
dm: correctly handle chained bios in dec_pending()

dec_pending() is given an error status (possibly 0) to be recorded
against a bio.  It can be called several times on the one 'struct
dm_io', and it is careful to only assign a non-zero error to
io->status.  However when it then assigned io->status to bio->bi_status,
it is not careful and could overwrite a genuine error status with 0.

This can happen when chained bios are in use.  If a bio is chained
beneath the bio that this dm_io is handling, the child bio might
complete and set bio->bi_status before the dm_io completes.

This has been possible since chained bios were introduced in 3.14, and
has become a lot easier to trigger with commit 18a25da84354 ("dm: ensure
bio submission follows a depth-first tree walk") as that commit caused
dm to start using chained bios itself.

A particular failure mode is that if a bio spans an 'error' target and a
working target, the 'error' fragment will complete instantly and set the
->bi_status, and the other fragment will normally complete a little
later, and will clear ->bi_status.

The fix is simply to only assign io_error to bio->bi_status when
io_error is not zero.

Reported-and-tested-by: Milan Broz <gmazyland@gmail.com>
Cc: stable@vger.kernel.org (v3.14+)
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
6 years agoMerge branch 'linux-4.16' of git://github.com/skeggsb/linux into drm-fixes
Dave Airlie [Fri, 16 Feb 2018 04:26:01 +0000 (14:26 +1000)]
Merge branch 'linux-4.16' of git://github.com/skeggsb/linux into drm-fixes

single fix for older gpus.

* 'linux-4.16' of git://github.com/skeggsb/linux:
  drm/nouveau: Make clock gate support conditional

6 years agodrm/nouveau: Make clock gate support conditional
Thierry Reding [Wed, 7 Feb 2018 17:40:27 +0000 (18:40 +0100)]
drm/nouveau: Make clock gate support conditional

The recently introduced clock gate support breaks on Tegra chips because
no thermal support is enabled for those devices. Conditionalize the code
on the existence of thermal support to fix this.

Fixes: b138eca661cc ("drm/nouveau: Add support for basic clockgating on Kepler1")
Cc: Martin Peres <martin.peres@free.fr>
Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
6 years agoMerge tag 'drm-intel-fixes-2018-02-14-1' of git://anongit.freedesktop.org/drm/drm...
Dave Airlie [Fri, 16 Feb 2018 02:33:03 +0000 (12:33 +1000)]
Merge tag 'drm-intel-fixes-2018-02-14-1' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

There are important fixes for VLV with MIPI/DSI panels,
2 clean-up patches needed for this MIPI/DSI fix,
and many fixes for GEM including fixes for Perf OA and PMU,
and fixes on scheduler and preemption.

This also includes GVT fixes: "This has one to fix GTT mmio 8b
access from guest and two simple ones for mmio switch and typo fix"

* tag 'drm-intel-fixes-2018-02-14-1' of git://anongit.freedesktop.org/drm/drm-intel:
  drm/i915: Fix DSI panels with v1 MIPI sequences without a DEASSERT sequence v3
  drm/i915: Free memdup-ed DSI VBT data structures on driver_unload
  drm/i915: Add intel_bios_cleanup() function
  drm/i915/vlv: Add cdclk workaround for DSI
  drm/i915/gvt: fix one typo of render_mmio trace
  drm/i915/gvt: Support BAR0 8-byte reads/writes
  drm/i915/gvt: add 0xe4f0 into gen9 render list
  drm/i915/pmu: Fix building without CONFIG_PM
  drm/i915/pmu: Fix sleep under atomic in RC6 readout
  drm/i915/pmu: Fix PMU enable vs execlists tasklet race
  drm/i915: Lock out execlist tasklet while peeking inside for busy-stats
  drm/i915/breadcrumbs: Ignore unsubmitted signalers
  drm/i915: Don't wake the device up to check if the engine is asleep
  drm/i915: Avoid truncation before clamping userspace's priority value
  drm/i915/perf: Fix compiler warning for string truncation
  drm/i915/perf: Fix compiler warning for string truncation

6 years agoMerge branch 'drm-next-4.16' of git://people.freedesktop.org/~agd5f/linux into drm...
Dave Airlie [Fri, 16 Feb 2018 02:30:41 +0000 (12:30 +1000)]
Merge branch 'drm-next-4.16' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

single atpx fix

* 'drm-next-4.16' of git://people.freedesktop.org/~agd5f/linux:
  drm/amdgpu: add new device to use atpx quirk

6 years agoMerge tag 'acpi-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Thu, 15 Feb 2018 22:50:32 +0000 (14:50 -0800)]
Merge tag 'acpi-4.16-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix a system resume regression from the 4.13 cycle, clean up
  device table handling in the ACPI core, update sysfs ABI documentation
  of a couple of drivers and add an expected switch fall-through marker
  to the SPCR table parsing code.

  Specifics:

   - Revert a problematic EC driver change from the 4.13 cycle that
     introduced a system resume regression on Thinkpad X240 (Rafael
     Wysocki).

   - Clean up device tables handling in the ACPI core and the related
     part of the device properties framework (Andy Shevchenko).

   - Update the sysfs ABI documentatio of the dock and the INT3407
     special device drivers (Aishwarya Pant).

   - Add an expected switch fall-through marker to the SPCR table
     parsing code (Gustavo Silva)"

* tag 'acpi-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: dock: document sysfs interface
  ACPI / DPTF: Document dptf_power sysfs atttributes
  device property: Constify device_get_match_data()
  ACPI / bus: Rename acpi_get_match_data() to acpi_device_get_match_data()
  ACPI / bus: Remove checks in acpi_get_match_data()
  ACPI / bus: Do not traverse through non-existed device table
  ACPI: SPCR: Mark expected switch fall-through in acpi_parse_spcr
  ACPI / EC: Restore polling during noirq suspend/resume phases

6 years agoMerge tag 'pm-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Thu, 15 Feb 2018 22:40:01 +0000 (14:40 -0800)]
Merge tag 'pm-4.16-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a recently introduced build issue related to cpuidle and two
  bugs in the PM core, update cpuidle documentation and clean up memory
  allocations in the operating performance points (OPP) framework.

  Specifics:

   - Fix a recently introduced build issue related to cpuidle by
     covering all of the relevant combinations of Kconfig options
     in its header (Rafael Wysocki).

   - Add missing invocation of pm_runtime_drop_link() to the
     !CONFIG_SRCU variant of __device_link_del() (Lukas Wunner).

   - Fix unbalanced IRQ enable in the wakeup interrupts framework
     (Tony Lindgren).

   - Update cpuidle sysfs ABI documentation (Aishwarya Pant).

   - Use GFP_KERNEL instead of GFP_ATOMIC for allocating memory
     in dev_pm_opp_init_cpufreq_table() (Jia-Ju Bai)"

* tag 'pm-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: cpuidle: Fix cpuidle_poll_state_init() prototype
  PM / runtime: Update links_count also if !CONFIG_SRCU
  PM / wakeirq: Fix unbalanced IRQ enable for wakeirq
  Documentation/ABI: update cpuidle sysfs documentation
  opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table

6 years agoMerge tag 'hwmon-for-linus-v4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Thu, 15 Feb 2018 22:31:28 +0000 (14:31 -0800)]
Merge tag 'hwmon-for-linus-v4.16-rc2' of git://git./linux/kernel/git/groeck/linux-staging

Pull hwmon fix from Guenter Roeck:
 "Fix bad temperature display on Ryzen/Threadripper"

* tag 'hwmon-for-linus-v4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (k10temp) Only apply temperature offset if result is positive

6 years agoMerge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
Linus Torvalds [Thu, 15 Feb 2018 22:29:27 +0000 (14:29 -0800)]
Merge tag 'for_linus' of git://git./linux/kernel/git/mst/vhost

Pull virtio fixes from Michael Tsirkin:
 "This includes a bugfix for virtio 9p fs. It also fixes hybernation for
  s390 guests with virtio devices"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio/s390: implement PM operations for virtio_ccw
  9p/trans_virtio: discard zero-length reply

6 years agosparc,leon: Select USB_UHCI_BIG_ENDIAN_{MMIO,DESC}
James Hogan [Wed, 31 Jan 2018 22:24:46 +0000 (22:24 +0000)]
sparc,leon: Select USB_UHCI_BIG_ENDIAN_{MMIO,DESC}

Now that USB_UHCI_BIG_ENDIAN_MMIO and USB_UHCI_BIG_ENDIAN_DESC are moved
outside of the USB_SUPPORT conditional, simply select them from
SPARC_LEON rather than by the symbol's defaults in drivers/usb/Kconfig,
similar to how it is done for USB_EHCI_BIG_ENDIAN_MMIO and
USB_EHCI_BIG_ENDIAN_DESC.

Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Corentin Labbe <clabbe.montjoie@gmail.com>
Cc: sparclinux@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Patchwork: https://patchwork.linux-mips.org/patch/18560/

6 years agousb: Move USB_UHCI_BIG_ENDIAN_* out of USB_SUPPORT
James Hogan [Wed, 31 Jan 2018 22:24:45 +0000 (22:24 +0000)]
usb: Move USB_UHCI_BIG_ENDIAN_* out of USB_SUPPORT

Move the Kconfig symbols USB_UHCI_BIG_ENDIAN_MMIO and
USB_UHCI_BIG_ENDIAN_DESC out of drivers/usb/host/Kconfig, which is
conditional upon USB && USB_SUPPORT, so that it can be freely selected
by platform Kconfig symbols in architecture code.

For example once the MIPS_GENERIC platform selects are fixed in commit
2e6522c56552 ("MIPS: Fix typo BIG_ENDIAN to CPU_BIG_ENDIAN"), the MIPS
32r6_defconfig warns like so:

warning: (MIPS_GENERIC) selects USB_UHCI_BIG_ENDIAN_MMIO which has unmet direct dependencies (USB_SUPPORT && USB)
warning: (MIPS_GENERIC) selects USB_UHCI_BIG_ENDIAN_DESC which has unmet direct dependencies (USB_SUPPORT && USB)

Fixes: 2e6522c56552 ("MIPS: Fix typo BIG_ENDIAN to CPU_BIG_ENDIAN")
Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Corentin Labbe <clabbe.montjoie@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: linux-usb@vger.kernel.org
Cc: linux-mips@linux-mips.org
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Patchwork: https://patchwork.linux-mips.org/patch/18559/

6 years agoMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Thu, 15 Feb 2018 17:28:47 +0000 (09:28 -0800)]
Merge branch 'sched-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes:

   - fix rq->lock lockdep annotation bug

   - fix/improve update_curr_rt() and update_curr_dl() accounting

   - update documentation

   - remove unused macro"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cpufreq: Remove unused SUGOV_KTHREAD_PRIORITY macro
  sched/core: Fix DEBUG_SPINLOCK annotation for rq->lock
  sched/rt: Make update_curr_rt() more accurate
  sched/deadline: Make update_curr_dl() more accurate
  membarrier-sync-core: Document architecture support

6 years agoMerge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Thu, 15 Feb 2018 17:05:26 +0000 (09:05 -0800)]
Merge branch 'locking-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull locking fixes from Ingo Molnar:
 "This contains two qspinlock fixes and three documentation and comment
  fixes"

* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/semaphore: Update the file path in documentation
  locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit()
  locking/qspinlock: Ensure node->count is updated before initialising node
  locking/qspinlock: Ensure node is initialised before updating prev->next
  Documentation/locking/mutex-design: Update to reflect latest changes

6 years agoMerge branches 'acpi-ec', 'acpi-tables' and 'acpi-doc'
Rafael J. Wysocki [Thu, 15 Feb 2018 11:02:42 +0000 (12:02 +0100)]
Merge branches 'acpi-ec', 'acpi-tables' and 'acpi-doc'

* acpi-ec:
  ACPI / EC: Restore polling during noirq suspend/resume phases

* acpi-tables:
  ACPI: SPCR: Mark expected switch fall-through in acpi_parse_spcr

* acpi-doc:
  ACPI: dock: document sysfs interface
  ACPI / DPTF: Document dptf_power sysfs atttributes

6 years agoMerge branches 'pm-cpuidle' and 'pm-opp'
Rafael J. Wysocki [Thu, 15 Feb 2018 11:01:53 +0000 (12:01 +0100)]
Merge branches 'pm-cpuidle' and 'pm-opp'

* pm-cpuidle:
  PM: cpuidle: Fix cpuidle_poll_state_init() prototype
  Documentation/ABI: update cpuidle sysfs documentation

* pm-opp:
  opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table

6 years agoplatform/x86: dell-laptop: Removed duplicates in DMI whitelist
Alexander Abrosimov [Wed, 7 Feb 2018 22:12:26 +0000 (01:12 +0300)]
platform/x86: dell-laptop: Removed duplicates in DMI whitelist

Fixed a mistake in which several entries were duplicated in the DMI list
from the below commit
fe486138 platform/x86: dell-laptop: Add 2-in-1 devices to the DMI whitelist

Signed-off-by: Alexander Abrosimov <alexander.n.abrosimov@gmail.com>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
6 years agoplatform/x86: dell-laptop: fix kbd_get_state's request value
Laszlo Toth [Tue, 13 Feb 2018 20:43:43 +0000 (21:43 +0100)]
platform/x86: dell-laptop: fix kbd_get_state's request value

Commit 9862b43624a5 ("platform/x86: dell-laptop: Allocate buffer on heap
rather than globally")
broke one request, changed it back to the original value.

Tested on a Dell E6540, backlight came back.

Fixes: 9862b43624a5 ("platform/x86: dell-laptop: Allocate buffer on heap rather than globally")
Signed-off-by: Laszlo Toth <laszlth@gmail.com>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Reviewed-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
6 years agoplatform/x86: ideapad-laptop: Increase timeout to wait for EC answer
Aaron Ma [Sun, 11 Feb 2018 09:18:49 +0000 (17:18 +0800)]
platform/x86: ideapad-laptop: Increase timeout to wait for EC answer

Lenovo E41-20 needs more time than 100ms to read VPC,
the funtion keys always failed responding.
Increase timeout to get the value from VPC, then
the funtion keys like mic mute key work well.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
6 years agoplatform/x86: wmi: fix off-by-one write in wmi_dev_probe()
Andrey Ryabinin [Wed, 14 Feb 2018 11:55:24 +0000 (14:55 +0300)]
platform/x86: wmi: fix off-by-one write in wmi_dev_probe()

wmi_dev_probe() allocates one byte less than necessary, thus
subsequent sprintf() call writes trailing zero past the end
of the 'buf':

    BUG: KASAN: slab-out-of-bounds in vsnprintf+0xda4/0x1240
    Write of size 1 at addr ffff880423529caf by task kworker/1:1/32

    Call Trace:
     dump_stack+0xb3/0x14d
     print_address_description+0xd7/0x380
     kasan_report+0x166/0x2b0
     vsnprintf+0xda4/0x1240
     sprintf+0x9b/0xd0
     wmi_dev_probe+0x1c3/0x400
     driver_probe_device+0x5d1/0x990
     bus_for_each_drv+0x109/0x190
     __device_attach+0x217/0x360
     bus_probe_device+0x1ad/0x260
     deferred_probe_work_func+0x10f/0x5d0
     process_one_work+0xa8b/0x1dc0
     worker_thread+0x20d/0x17d0
     kthread+0x311/0x3d0
     ret_from_fork+0x3a/0x50

    Allocated by task 32:
     kasan_kmalloc+0xa0/0xd0
     __kmalloc+0x14f/0x3e0
     wmi_dev_probe+0x182/0x400
     driver_probe_device+0x5d1/0x990
     bus_for_each_drv+0x109/0x190
     __device_attach+0x217/0x360
     bus_probe_device+0x1ad/0x260
     deferred_probe_work_func+0x10f/0x5d0
     process_one_work+0xa8b/0x1dc0
     worker_thread+0x20d/0x17d0
     kthread+0x311/0x3d0
     ret_from_fork+0x3a/0x50

Increment allocation size to fix this.

Fixes: 44b6b7661132 ("platform/x86: wmi: create userspace interface for drivers")
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
6 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Thu, 15 Feb 2018 01:31:51 +0000 (17:31 -0800)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Misc fixes all across the map:

   - /proc/kcore vsyscall related fixes
   - LTO fix
   - build warning fix
   - CPU hotplug fix
   - Kconfig NR_CPUS cleanups
   - cpu_has() cleanups/robustification
   - .gitignore fix
   - memory-failure unmapping fix
   - UV platform fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm, mm/hwpoison: Don't unconditionally unmap kernel 1:1 pages
  x86/error_inject: Make just_return_func() globally visible
  x86/platform/UV: Fix GAM Range Table entries less than 1GB
  x86/build: Add arch/x86/tools/insn_decoder_test to .gitignore
  x86/smpboot: Fix uncore_pci_remove() indexing bug when hot-removing a physical CPU
  x86/mm/kcore: Add vsyscall page to /proc/kcore conditionally
  vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page
  x86/Kconfig: Further simplify the NR_CPUS config
  x86/Kconfig: Simplify NR_CPUS config
  x86/MCE: Fix build warning introduced by "x86: do not use print_symbol()"
  x86/cpufeature: Update _static_cpu_has() to use all named variables
  x86/cpufeature: Reindent _static_cpu_has()

6 years agoMerge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 15 Feb 2018 01:02:15 +0000 (17:02 -0800)]
Merge branch 'x86-pti-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 PTI and Spectre related fixes and updates from Ingo Molnar:
 "Here's the latest set of Spectre and PTI related fixes and updates:

  Spectre:
   - Add entry code register clearing to reduce the Spectre attack
     surface
   - Update the Spectre microcode blacklist
   - Inline the KVM Spectre helpers to get close to v4.14 performance
     again.
   - Fix indirect_branch_prediction_barrier()
   - Fix/improve Spectre related kernel messages
   - Fix array_index_nospec_mask() asm constraint
   - KVM: fix two MSR handling bugs

  PTI:
   - Fix a paranoid entry PTI CR3 handling bug
   - Fix comments

  objtool:
   - Fix paranoid_entry() frame pointer warning
   - Annotate WARN()-related UD2 as reachable
   - Various fixes
   - Add Add Peter Zijlstra as objtool co-maintainer

  Misc:
   - Various x86 entry code self-test fixes
   - Improve/simplify entry code stack frame generation and handling
     after recent heavy-handed PTI and Spectre changes. (There's two
     more WIP improvements expected here.)
   - Type fix for cache entries

  There's also some low risk non-fix changes I've included in this
  branch to reduce backporting conflicts:

   - rename a confusing x86_cpu field name
   - de-obfuscate the naming of single-TLB flushing primitives"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (41 commits)
  x86/entry/64: Fix CR3 restore in paranoid_exit()
  x86/cpu: Change type of x86_cache_size variable to unsigned int
  x86/spectre: Fix an error message
  x86/cpu: Rename cpu_data.x86_mask to cpu_data.x86_stepping
  selftests/x86/mpx: Fix incorrect bounds with old _sigfault
  x86/mm: Rename flush_tlb_single() and flush_tlb_one() to __flush_tlb_one_[user|kernel]()
  x86/speculation: Add <asm/msr-index.h> dependency
  nospec: Move array_index_nospec() parameter checking into separate macro
  x86/speculation: Fix up array_index_nospec_mask() asm constraint
  x86/debug: Use UD2 for WARN()
  x86/debug, objtool: Annotate WARN()-related UD2 as reachable
  objtool: Fix segfault in ignore_unreachable_insn()
  selftests/x86: Disable tests requiring 32-bit support on pure 64-bit systems
  selftests/x86: Do not rely on "int $0x80" in single_step_syscall.c
  selftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c
  selftests/x86: Fix build bug caused by the 5lvl test which has been moved to the VM directory
  selftests/x86/pkeys: Remove unused functions
  selftests/x86: Clean up and document sscanf() usage
  selftests/x86: Fix vDSO selftest segfault for vsyscall=none
  x86/entry/64: Remove the unused 'icebp' macro
  ...

6 years agox86/entry/64: Fix CR3 restore in paranoid_exit()
Ingo Molnar [Wed, 14 Feb 2018 07:39:11 +0000 (08:39 +0100)]
x86/entry/64: Fix CR3 restore in paranoid_exit()

Josh Poimboeuf noticed the following bug:

 "The paranoid exit code only restores the saved CR3 when it switches back
  to the user GS.  However, even in the kernel GS case, it's possible that
  it needs to restore a user CR3, if for example, the paranoid exception
  occurred in the syscall exit path between SWITCH_TO_USER_CR3_STACK and
  SWAPGS."

Josh also confirmed via targeted testing that it's possible to hit this bug.

Fix the bug by also restoring CR3 in the paranoid_exit_no_swapgs branch.

The reason we haven't seen this bug reported by users yet is probably because
"paranoid" entry points are limited to the following cases:

 idtentry double_fault       do_double_fault  has_error_code=1  paranoid=2
 idtentry debug              do_debug         has_error_code=0  paranoid=1 shift_ist=DEBUG_STACK
 idtentry int3               do_int3          has_error_code=0  paranoid=1 shift_ist=DEBUG_STACK
 idtentry machine_check      do_mce           has_error_code=0  paranoid=1

Amongst those entry points only machine_check is one that will interrupt an
IRQS-off critical section asynchronously - and machine check events are rare.

The other main asynchronous entries are NMI entries, which can be very high-freq
with perf profiling, but they are special: they don't use the 'idtentry' macro but
are open coded and restore user CR3 unconditionally so don't have this bug.

Reported-and-tested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180214073910.boevmg65upbk3vqb@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/cpu: Change type of x86_cache_size variable to unsigned int
Gustavo A. R. Silva [Tue, 13 Feb 2018 19:22:08 +0000 (13:22 -0600)]
x86/cpu: Change type of x86_cache_size variable to unsigned int

Currently, x86_cache_size is of type int, which makes no sense as we
will never have a valid cache size equal or less than 0. So instead of
initializing this variable to -1, it can perfectly be initialized to 0
and use it as an unsigned variable instead.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Addresses-Coverity-ID: 1464429
Link: http://lkml.kernel.org/r/20180213192208.GA26414@embeddedor.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/spectre: Fix an error message
Dan Carpenter [Wed, 14 Feb 2018 07:14:17 +0000 (10:14 +0300)]
x86/spectre: Fix an error message

If i == ARRAY_SIZE(mitigation_options) then we accidentally print
garbage from one space beyond the end of the mitigation_options[] array.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-janitors@vger.kernel.org
Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
Link: http://lkml.kernel.org/r/20180214071416.GA26677@mwanda
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/cpu: Rename cpu_data.x86_mask to cpu_data.x86_stepping
Jia Zhang [Mon, 1 Jan 2018 01:52:10 +0000 (09:52 +0800)]
x86/cpu: Rename cpu_data.x86_mask to cpu_data.x86_stepping

x86_mask is a confusing name which is hard to associate with the
processor's stepping.

Additionally, correct an indent issue in lib/cpu.c.

Signed-off-by: Jia Zhang <qianyue.zj@alibaba-inc.com>
[ Updated it to more recent kernels. ]
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@alien8.de
Cc: tony.luck@intel.com
Link: http://lkml.kernel.org/r/1514771530-70829-1-git-send-email-qianyue.zj@alibaba-inc.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86/mpx: Fix incorrect bounds with old _sigfault
Rui Wang [Mon, 18 Dec 2017 08:34:10 +0000 (16:34 +0800)]
selftests/x86/mpx: Fix incorrect bounds with old _sigfault

For distributions with old userspace header files, the _sigfault
structure is different. mpx-mini-test fails with the following
error:

  [root@Purley]# mpx-mini-test_64 tabletest
  XSAVE is supported by HW & OS
  XSAVE processor supported state mask: 0x2ff
  XSAVE OS supported state mask: 0x2ff
   BNDREGS: size: 64 user: 1 supervisor: 0 aligned: 0
    BNDCSR: size: 64 user: 1 supervisor: 0 aligned: 0
  starting mpx bounds table test
  ERROR: siginfo bounds do not match shadow bounds for register 0

Fix it by using the correct offset of _lower/_upper in _sigfault.
RHEL needs this patch to work.

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave.hansen@linux.intel.com
Fixes: e754aedc26ef ("x86/mpx, selftests: Add MPX self test")
Link: http://lkml.kernel.org/r/1513586050-1641-1-git-send-email-rui.y.wang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/mm: Rename flush_tlb_single() and flush_tlb_one() to __flush_tlb_one_[user|kernel]()
Andy Lutomirski [Wed, 31 Jan 2018 16:03:10 +0000 (08:03 -0800)]
x86/mm: Rename flush_tlb_single() and flush_tlb_one() to __flush_tlb_one_[user|kernel]()

flush_tlb_single() and flush_tlb_one() sound almost identical, but
they really mean "flush one user translation" and "flush one kernel
translation".  Rename them to flush_tlb_one_user() and
flush_tlb_one_kernel() to make the semantics more obvious.

[ I was looking at some PTI-related code, and the flush-one-address code
  is unnecessarily hard to understand because the names of the helpers are
  uninformative.  This came up during PTI review, but no one got around to
  doing it. ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Kees Cook <keescook@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/3303b02e3c3d049dc5235d5651e0ae6d29a34354.1517414378.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/speculation: Add <asm/msr-index.h> dependency
Peter Zijlstra [Tue, 13 Feb 2018 13:28:19 +0000 (14:28 +0100)]
x86/speculation: Add <asm/msr-index.h> dependency

Joe Konno reported a compile failure resulting from using an MSR
without inclusion of <asm/msr-index.h>, and while the current code builds
fine (by accident) this needs fixing for future patches.

Reported-by: Joe Konno <joe.konno@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arjan@linux.intel.com
Cc: bp@alien8.de
Cc: dan.j.williams@intel.com
Cc: dave.hansen@linux.intel.com
Cc: dwmw2@infradead.org
Cc: dwmw@amazon.co.uk
Cc: gregkh@linuxfoundation.org
Cc: hpa@zytor.com
Cc: jpoimboe@redhat.com
Cc: linux-tip-commits@vger.kernel.org
Cc: luto@kernel.org
Fixes: 20ffa1caecca ("x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support")
Link: http://lkml.kernel.org/r/20180213132819.GJ25201@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agonospec: Move array_index_nospec() parameter checking into separate macro
Will Deacon [Mon, 5 Feb 2018 14:16:06 +0000 (14:16 +0000)]
nospec: Move array_index_nospec() parameter checking into separate macro

For architectures providing their own implementation of
array_index_mask_nospec() in asm/barrier.h, attempting to use WARN_ONCE() to
complain about out-of-range parameters using WARN_ON() results in a mess
of mutually-dependent include files.

Rather than unpick the dependencies, simply have the core code in nospec.h
perform the checking for us.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1517840166-15399-1-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/speculation: Fix up array_index_nospec_mask() asm constraint
Dan Williams [Wed, 7 Feb 2018 02:22:40 +0000 (18:22 -0800)]
x86/speculation: Fix up array_index_nospec_mask() asm constraint

Allow the compiler to handle @size as an immediate value or memory
directly rather than allocating a register.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/151797010204.1289.1510000292250184993.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/debug: Use UD2 for WARN()
Peter Zijlstra [Fri, 9 Feb 2018 12:16:59 +0000 (13:16 +0100)]
x86/debug: Use UD2 for WARN()

Since the Intel SDM added an ModR/M byte to UD0 and binutils followed
that specification, we now cannot disassemble our kernel anymore.

This now means Intel and AMD disagree on the encoding of UD0. And instead
of playing games with additional bytes that are valid ModR/M and single
byte instructions (0xd6 for instance), simply use UD2 for both WARN() and
BUG().

Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180208194406.GD25181@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/debug, objtool: Annotate WARN()-related UD2 as reachable
Josh Poimboeuf [Thu, 8 Feb 2018 23:09:26 +0000 (17:09 -0600)]
x86/debug, objtool: Annotate WARN()-related UD2 as reachable

By default, objtool assumes that a UD2 is a dead end.  This is mainly
because GCC 7+ sometimes inserts a UD2 when it detects a divide-by-zero
condition.

Now that WARN() is moving back to UD2, annotate the code after it as
reachable so objtool can follow the code flow.

Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kbuild test robot <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/0e483379275a42626ba8898117f918e1bf661e40.1518130694.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoobjtool: Fix segfault in ignore_unreachable_insn()
Josh Poimboeuf [Thu, 8 Feb 2018 23:09:25 +0000 (17:09 -0600)]
objtool: Fix segfault in ignore_unreachable_insn()

Peter Zijlstra's patch for converting WARN() to use UD2 triggered a
bunch of false "unreachable instruction" warnings, which then triggered
a seg fault in ignore_unreachable_insn().

The seg fault happened when it tried to dereference a NULL 'insn->func'
pointer.  Thanks to static_cpu_has(), some functions can jump to a
non-function area in the .altinstr_aux section.  That breaks
ignore_unreachable_insn()'s assumption that it's always inside the
original function.

Make sure ignore_unreachable_insn() only follows jumps within the
current function.

Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kbuild test robot <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/bace77a60d5af9b45eddb8f8fb9c776c8de657ef.1518130694.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86: Disable tests requiring 32-bit support on pure 64-bit systems
Dominik Brodowski [Tue, 13 Feb 2018 08:15:19 +0000 (09:15 +0100)]
selftests/x86: Disable tests requiring 32-bit support on pure 64-bit systems

The ldt_gdt and ptrace_syscall selftests, even in their 64-bit variant, use
hard-coded 32-bit syscall numbers and call "int $0x80".

This will fail on 64-bit systems with CONFIG_IA32_EMULATION=y disabled.

Therefore, do not build these tests if we cannot build 32-bit binaries
(which should be a good approximation for CONFIG_IA32_EMULATION=y being enabled).

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kselftest@vger.kernel.org
Cc: shuah@kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-6-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86: Do not rely on "int $0x80" in single_step_syscall.c
Dominik Brodowski [Tue, 13 Feb 2018 08:13:21 +0000 (09:13 +0100)]
selftests/x86: Do not rely on "int $0x80" in single_step_syscall.c

On 64-bit builds, we should not rely on "int $0x80" working (it only does if
CONFIG_IA32_EMULATION=y is enabled). To keep the "Set TF and check int80"
test running on 64-bit installs with CONFIG_IA32_EMULATION=y enabled, build
this test only if we can also build 32-bit binaries (which should be a
good approximation for that).

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kselftest@vger.kernel.org
Cc: shuah@kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-5-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agodrm/i915: Fix DSI panels with v1 MIPI sequences without a DEASSERT sequence v3
Hans de Goede [Wed, 14 Feb 2018 08:21:51 +0000 (09:21 +0100)]
drm/i915: Fix DSI panels with v1 MIPI sequences without a DEASSERT sequence v3

So far models of the Dell Venue 8 Pro, with a panel with MIPI panel
index = 3, one of which has been kindly provided to me by Jan Brummer,
where not working with the i915 driver, giving a black screen on the
first modeset.

The problem with at least these Dells is that their VBT defines a MIPI
ASSERT sequence, but not a DEASSERT sequence. Instead they DEASSERT the
reset in their INIT_OTP sequence, but the deassert must be done before
calling intel_dsi_device_ready(), so that is too late.

Simply doing the INIT_OTP sequence earlier is not enough to fix this,
because the INIT_OTP sequence also sends various MIPI packets to the
panel, which can only happen after calling intel_dsi_device_ready().

This commit fixes this by splitting the INIT_OTP sequence into everything
before the first DSI packet and everything else, including the first DSI
packet. The first part (everything before the first DSI packet) is then
used as deassert sequence.

Changed in v2:
-Split the init OTP sequence into a deassert reset and the actual init
 OTP sequence, instead of calling it earlier and then having the first
 mipi_exec_send_packet() call call intel_dsi_device_ready().

Changes in v3:
-Move the whole shebang to intel_bios.c

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82880
References: https://bugs.freedesktop.org/show_bug.cgi?id=101205
Cc: Jan-Michael Brummer <jan.brummer@tabos.org>
Reported-by: Jan-Michael Brummer <jan.brummer@tabos.org>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214082151.25015-3-hdegoede@redhat.com
(cherry picked from commit fb38e7ade9af4f3e96f5916c3f6f19bfc7d5f961)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
6 years agodrm/i915: Free memdup-ed DSI VBT data structures on driver_unload
Hans de Goede [Wed, 14 Feb 2018 08:21:50 +0000 (09:21 +0100)]
drm/i915: Free memdup-ed DSI VBT data structures on driver_unload

Make intel_bios_cleanup function free the DSI VBT data structures which
are memdup-ed by parse_mipi_config() and parse_mipi_sequence().

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214082151.25015-2-hdegoede@redhat.com
(cherry picked from commit e1b86c85f6c2029c31dba99823b6f3d9e15eaacd)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
6 years agodrm/i915: Add intel_bios_cleanup() function
Hans de Goede [Wed, 14 Feb 2018 08:21:49 +0000 (09:21 +0100)]
drm/i915: Add intel_bios_cleanup() function

Add an intel_bios_cleanup() function to act as counterpart of
intel_bios_init() and move the cleanup of vbt related resources there,
putting it in the same file as the allocation.

Changed in v2:
-While touching the code anyways, remove the unnecessary:
 if (dev_priv->vbt.child_dev) done before kfree(dev_priv->vbt.child_dev)

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214082151.25015-1-hdegoede@redhat.com
(cherry picked from commit 785f076b3ba781804f2b22b347b4431e3efb0ab3)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
6 years agodrm/i915/vlv: Add cdclk workaround for DSI
Hans de Goede [Wed, 20 Dec 2017 10:50:17 +0000 (11:50 +0100)]
drm/i915/vlv: Add cdclk workaround for DSI

At least on the Chuwi Vi8 (non pro/plus) the LCD panel will show an image
shifted aprox. 20% to the left (with wraparound) and sometimes also wrong
colors, showing that the panel controller is starting with sampling the
datastream somewhere mid-line. This happens after the first blanking and
re-init of the panel.

After looking at drm.debug output I noticed that initially we inherit the
cdclk of 333333 KHz set by the GOP, but after the re-init we picked 266667
KHz, which turns out to be the cause of this problem, a quick hack to hard
code the cdclk to 333333 KHz makes the problem go away.

I've tested this on various Bay Trail devices, to make sure this not does
cause regressions on other devices and the higher cdclk does not cause
any problems on the following devices:
-GP-electronic T701      1024x600   333333 KHz cdclk after this patch
-PEAQ C1010              1920x1200  333333 KHz cdclk after this patch
-PoV mobii-wintab-800w    800x1280  333333 KHz cdclk after this patch
-Asus Transformer-T100TA 1368x768   320000 KHz cdclk after this patch

Also interesting wrt this is the comment in vlv_calc_cdclk about the
existing workaround to avoid 200 Mhz as clock because that causes issues
in some cases.

This commit extends the "do not use 200 Mhz" workaround with an extra
check to require atleast 320000 KHz (avoiding 266667 KHz) when a DSI
panel is active.

Changes in v2:
-Change the commit message and the code comment to not treat the GOP as
 a reference, the GOP should not be treated as a reference

Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220105017.11259-1-hdegoede@redhat.com
(cherry picked from commit c8dae55a8ced625038d52d26e48273707fab2688)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
6 years agoMerge tag 'gvt-fixes-2018-02-14' of https://github.com/intel/gvt-linux into drm-intel...
Rodrigo Vivi [Wed, 14 Feb 2018 19:23:20 +0000 (11:23 -0800)]
Merge tag 'gvt-fixes-2018-02-14' of https://github.com/intel/gvt-linux into drm-intel-fixes

gvt-fixes-2018-02-14

- gtt mmio 8b access fix (Tina)
- one KBL required mmio reg for switch (Weinan)
- one trace log typo fix (Weinan)

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214052827.4nny7vkcoca4vjhn@zhen-hp.sh.intel.com
6 years agoMerge tag 'gfs2-4.16.rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 14 Feb 2018 18:14:59 +0000 (10:14 -0800)]
Merge tag 'gfs2-4.16.rc1.fixes' of git://git./linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fix from Bob Peterson:
 "Fix regressions in the gfs2 iomap for block_map implementation we
  recently discovered in commit 3974320ca6"

* tag 'gfs2-4.16.rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Fixes to "Implement iomap for block_map"

6 years agoMerge tag 'powerpc-4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Wed, 14 Feb 2018 18:06:41 +0000 (10:06 -0800)]
Merge tag 'powerpc-4.16-2' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "A larger batch of fixes than we'd like. Roughly 1/3 fixes for new
  code, 1/3 fixes for stable and 1/3 minor things.

  There's four commits fixing bugs when using 16GB huge pages on hash,
  caused by some of the preparatory changes for pkeys.

  Two fixes for bugs in the enhanced IRQ soft masking for local_t, one
  of which broke KVM in some circumstances.

  Four fixes for Power9. The most bizarre being a bug where futexes
  stopped working because a NULL pointer dereference didn't trap during
  early boot (it aliased the kernel mapping). A fix for memory hotplug
  when using the Radix MMU, and a fix for live migration of guests using
  the Radix MMU.

  Two fixes for hotplug on pseries machines. One where we weren't
  correctly updating NUMA info when CPUs are added and removed. And the
  other fixes crashes/hangs seen when doing memory hot remove during
  boot, which is apparently a thing people do.

  Finally a handful of build fixes for obscure configs and other minor
  fixes.

  Thanks to: Alexey Kardashevskiy, Aneesh Kumar K.V, Balbir Singh, Colin
  Ian King, Daniel Henrique Barboza, Florian Weimer, Guenter Roeck,
  Harish, Laurent Vivier, Madhavan Srinivasan, Mauricio Faria de
  Oliveira, Nathan Fontenot, Nicholas Piggin, Sam Bobroff"

* tag 'powerpc-4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  selftests/powerpc: Fix to use ucontext_t instead of struct ucontext
  powerpc/kdump: Fix powernv build break when KEXEC_CORE=n
  powerpc/pseries: Fix build break for SPLPAR=n and CPU hotplug
  powerpc/mm/hash64: Zero PGD pages on allocation
  powerpc/mm/hash64: Store the slot information at the right offset for hugetlb
  powerpc/mm/hash64: Allocate larger PMD table if hugetlb config is enabled
  powerpc/mm: Fix crashes with 16G huge pages
  powerpc/mm: Flush radix process translations when setting MMU type
  powerpc/vas: Don't set uses_vas for kernel windows
  powerpc/pseries: Enable RAS hotplug events later
  powerpc/mm/radix: Split linear mapping on hot-unplug
  powerpc/64s/radix: Boot-time NULL pointer protection using a guard-PID
  ocxl: fix signed comparison with less than zero
  powerpc/64s: Fix may_hard_irq_enable() for PMI soft masking
  powerpc/64s: Fix MASKABLE_RELON_EXCEPTION_HV_OOL macro
  powerpc/numa: Invalidate numa_cpu_lookup_table on cpu remove

6 years agovirtio/s390: implement PM operations for virtio_ccw
Christian Borntraeger [Mon, 18 Dec 2017 16:21:23 +0000 (17:21 +0100)]
virtio/s390: implement PM operations for virtio_ccw

Suspend/Resume to/from disk currently fails. Let us wire
up the necessary callbacks. This is mostly just forwarding
the requests to the virtio drivers. The only thing that
has to be done in virtio_ccw itself is to re-set the
virtio revision.

Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20171207141102.70190-2-borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[CH: merged <20171218083706.223836-1-borntraeger@de.ibm.com> to fix
!CONFIG_PM configs]
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
6 years agoALSA: hda/realtek: PCI quirk for Fujitsu U7x7
Jan-Marek Glogowski [Wed, 14 Feb 2018 10:29:15 +0000 (11:29 +0100)]
ALSA: hda/realtek: PCI quirk for Fujitsu U7x7

These laptops have a combined jack to attach headsets, the U727 on
the left, the U757 on the right, but a headsets microphone doesn't
work. Using hdajacksensetest I found that pin 0x19 changed the
present state when plugging the headset, in addition to 0x21, but
didn't have the correct configuration (shown as "Not connected").

So this sets the configuration to the same values as the headphone
pin 0x21 except for the device type microphone, which makes it
work correctly. With the patch the configured pins for U727 are

Pin 0x12 (Internal Mic, Mobile-In): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x19 (Black Mic, Left side): present = No
Pin 0x1d (Internal Aux): present = No
Pin 0x21 (Black Headphone, Left side): present = No

Signed-off-by: Jan-Marek Glogowski <glogow@fbihome.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
6 years agoALSA: seq: Fix racy pool initializations
Takashi Iwai [Mon, 12 Feb 2018 14:20:51 +0000 (15:20 +0100)]
ALSA: seq: Fix racy pool initializations

ALSA sequencer core initializes the event pool on demand by invoking
snd_seq_pool_init() when the first write happens and the pool is
empty.  Meanwhile user can reset the pool size manually via ioctl
concurrently, and this may lead to UAF or out-of-bound accesses since
the function tries to vmalloc / vfree the buffer.

A simple fix is to just wrap the snd_seq_pool_init() call with the
recently introduced client->ioctl_mutex; as the calls for
snd_seq_pool_init() from other side are always protected with this
mutex, we can avoid the race.

Reported-by: 范龙飞 <long7573@126.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
6 years agodrm/i915/gvt: fix one typo of render_mmio trace
Weinan Li [Mon, 12 Feb 2018 07:28:42 +0000 (15:28 +0800)]
drm/i915/gvt: fix one typo of render_mmio trace

Fix one typo of render_mmio trace, exchange the mmio value of old and new.

Signed-off-by: Weinan Li <weinan.z.li@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
6 years agodrm/i915/gvt: Support BAR0 8-byte reads/writes
Tina Zhang [Sun, 11 Feb 2018 06:59:19 +0000 (14:59 +0800)]
drm/i915/gvt: Support BAR0 8-byte reads/writes

GGTT is in BAR0 with 8 bytes aligned. With a qemu patch (commit:
38d49e8c1523d97d2191190d3f7b4ce7a0ab5aa3), VFIO can use 8-byte reads/
writes to access it.

This patch is to support the 8-byte GGTT reads/writes.

Ideally, we would like to support 8-byte reads/writes for the total BAR0.
But it needs more work for handling 8-byte MMIO reads/writes.

This patch can fix the issue caused by partial updating GGTT entry, during
guest booting up.

v3:
- Use intel_vgpu_get_bar_gpa() stead. (Zhenyu)
- Include all the GGTT checking logic in gtt_entry(). (Zhenyu)

v2:
- Limit to GGTT entry. (Zhenyu)

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
6 years agodrm/i915/gvt: add 0xe4f0 into gen9 render list
Weinan Li [Fri, 9 Feb 2018 08:01:34 +0000 (16:01 +0800)]
drm/i915/gvt: add 0xe4f0 into gen9 render list

Guest may set this register on KBL platform, it can impact hardware
behavior, so add it into the gen9 render list. Otherwise gpu hang issue may
happen during different vgpu switch.

v2: separate it from patch set.

Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Weinan Li <weinan.z.li@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
6 years agodrm/i915/pmu: Fix building without CONFIG_PM
Chris Wilson [Tue, 13 Feb 2018 09:57:47 +0000 (09:57 +0000)]
drm/i915/pmu: Fix building without CONFIG_PM

As we peek inside struct device to query members guarded by CONFIG_PM,
so must be the code.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: 1fe699e30113 ("drm/i915/pmu: Fix sleep under atomic in RC6 readout")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207160428.17015-1-chris@chris-wilson.co.uk
(cherry picked from commit 05273c950a3c93c5f96be8807eaf24f2cc9f1c1e)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180213095747.2424-4-tvrtko.ursulin@linux.intel.com
6 years agodrm/i915/pmu: Fix sleep under atomic in RC6 readout
Tvrtko Ursulin [Tue, 13 Feb 2018 09:57:46 +0000 (09:57 +0000)]
drm/i915/pmu: Fix sleep under atomic in RC6 readout

We are not allowed to call intel_runtime_pm_get from the PMU counter read
callback since the former can sleep, and the latter is running under IRQ
context.

To workaround this, we record the last known RC6 and while runtime
suspended estimate its increase by querying the runtime PM core
timestamps.

Downside of this approach is that we can temporarily lose a chunk of RC6
time, from the last PMU read-out to runtime suspend entry, but that will
eventually catch up, once device comes back online and in the presence of
PMU queries.

Also, we have to be careful not to overshoot the RC6 estimate, so once
resumed after a period of approximation, we only update the counter once
it catches up. With the observation that RC6 is increasing while the
device is suspended, this should not pose a problem and can only cause
slight inaccuracies due clock base differences.

v2: Simplify by estimating on top of PM core counters. (Imre)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104943
Fixes: 6060b6aec03c ("drm/i915/pmu: Add RC6 residency metrics")
Testcase: igt/perf_pmu/rc6-runtime-pm
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180206183311.17924-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit 1fe699e30113ed6f6e853ff44710d256072ea627)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180213095747.2424-3-tvrtko.ursulin@linux.intel.com
6 years agodrm/i915/pmu: Fix PMU enable vs execlists tasklet race
Tvrtko Ursulin [Tue, 13 Feb 2018 09:57:45 +0000 (09:57 +0000)]
drm/i915/pmu: Fix PMU enable vs execlists tasklet race

Commit 99e48bf98dd0 ("drm/i915: Lock out execlist tasklet while peeking
inside for busy-stats") added a tasklet_disable call in busy stats
enabling, but we failed to understand that the PMU enable callback runs
as an hard IRQ (IPI).

Consequence of this is that the PMU enable callback can interrupt the
execlists tasklet, and will then deadlock when it calls
intel_engine_stats_enable->tasklet_disable.

To fix this, I realized it is possible to move the engine stats enablement
and disablement to PMU event init and destroy hooks. This allows for much
simpler implementation since those hooks run in normal context (can
sleep).

v2: Extract engine_event_destroy. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 99e48bf98dd0 ("drm/i915: Lock out execlist tasklet while peeking inside for busy-stats")
Testcase: igt/perf_pmu/enable-race-*
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180205093448.13877-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit b2f78cda260bc6a1a2d382b1d85a29e69b5b3724)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180213095747.2424-2-tvrtko.ursulin@linux.intel.com
6 years agodrm/i915: Lock out execlist tasklet while peeking inside for busy-stats
Chris Wilson [Tue, 13 Feb 2018 09:57:44 +0000 (09:57 +0000)]
drm/i915: Lock out execlist tasklet while peeking inside for busy-stats

In order to prevent a race condition where we may end up overaccounting
the active state and leaving the busy-stats believing the GPU is 100%
busy, lock out the tasklet while we reconstruct the busy state. There is
no direct spinlock guard for the execlists->port[], so we need to
utilise tasklet_disable() as a synchronous barrier to prevent it, the
only writer to execlists->port[], from running at the same time as the
enable.

Fixes: 4900727d35bb ("drm/i915/pmu: Reconstruct active state on starting busy-stats")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180115092041.13509-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
(cherry picked from commit 99e48bf98dd036090b480a12c39e8b971731247e)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180213095747.2424-1-tvrtko.ursulin@linux.intel.com
6 years agodrm/i915/breadcrumbs: Ignore unsubmitted signalers
Chris Wilson [Tue, 13 Feb 2018 09:01:54 +0000 (09:01 +0000)]
drm/i915/breadcrumbs: Ignore unsubmitted signalers

When a request is preempted, it is unsubmitted from the HW queue and
removed from the active list of breadcrumbs. In the process, this
however triggers the signaler and it may see the clear rbtree with the
old, and still valid, seqno, or it may match the cleared seqno with the
now zero rq->global_seqno. This confuses the signaler into action and
signaling the fence.

Fixes: d6a2289d9d6b ("drm/i915: Remove the preempted request from the execution queue")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.12+
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180206094633.30181-1-chris@chris-wilson.co.uk
(cherry picked from commit fd10e2ce9905030d922e179a8047a4d50daffd8e)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180213090154.17373-1-chris@chris-wilson.co.uk
6 years agogfs2: Fixes to "Implement iomap for block_map"
Andreas Gruenbacher [Tue, 6 Feb 2018 14:20:55 +0000 (07:20 -0700)]
gfs2: Fixes to "Implement iomap for block_map"

It turns out that commit 3974320ca6 "Implement iomap for block_map"
introduced a few bugs that trigger occasional failures with xfstest
generic/476:

In gfs2_iomap_begin, we jump to do_alloc when we determine that we are
beyond the end of the allocated metadata (height > ip->i_height).
There, we can end up calling hole_size with a metapath that doesn't
match the current metadata tree, which doesn't make sense.  After
untangling the code at do_alloc, fix this by checking if the block we
are looking for is within the range of allocated metadata.

In addition, add a BUG() in case gfs2_iomap_begin is accidentally called
for reading stuffed files: this is handled separately.  Make sure we
don't truncate iomap->length for reads beyond the end of the file; in
that case, the entire range counts as a hole.

Finally, revert to taking a bitmap write lock when doing allocations.
It's unclear why that change didn't lead to any failures during testing.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
6 years agoMerge tag 'mips_4.16_2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips
Linus Torvalds [Tue, 13 Feb 2018 17:35:17 +0000 (09:35 -0800)]
Merge tag 'mips_4.16_2' of git://git./linux/kernel/git/jhogan/mips

Pull MIPS fix from James Hogan:
 "A single change (and associated DT binding update) to allow the
  address of the MIPS Cluster Power Controller (CPC) to be chosen by DT,
  which allows SMP to work on generic MIPS kernels where the bootloader
  hasn't configured the CPC address (i.e. the new Ranchu platform)"

* tag 'mips_4.16_2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips:
  MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()
  dt-bindings: Document mti,mips-cpc binding

6 years agopowerpc/macio: set a proper dma_coherent_mask
Christoph Hellwig [Tue, 13 Feb 2018 15:44:34 +0000 (07:44 -0800)]
powerpc/macio: set a proper dma_coherent_mask

We have expected busses to set up a coherent mask to properly use the
common dma mapping code for a long time, and now that I've added a warning
macio turned out to not set one up yet.  This sets it to the same value
as the dma_mask, which seems to be what the drivers expect.

Reported-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Mathieu Malaterre <malat@debian.org>
Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Christoph Hellwig <hch@lst.de>
6 years agox86/mm, mm/hwpoison: Don't unconditionally unmap kernel 1:1 pages
Tony Luck [Thu, 25 Jan 2018 22:23:48 +0000 (14:23 -0800)]
x86/mm, mm/hwpoison: Don't unconditionally unmap kernel 1:1 pages

In the following commit:

  ce0fa3e56ad2 ("x86/mm, mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages")

... we added code to memory_failure() to unmap the page from the
kernel 1:1 virtual address space to avoid speculative access to the
page logging additional errors.

But memory_failure() may not always succeed in taking the page offline,
especially if the page belongs to the kernel.  This can happen if
there are too many corrected errors on a page and either mcelog(8)
or drivers/ras/cec.c asks to take a page offline.

Since we remove the 1:1 mapping early in memory_failure(), we can
end up with the page unmapped, but still in use. On the next access
the kernel crashes :-(

There are also various debug paths that call memory_failure() to simulate
occurrence of an error. Since there is no actual error in memory, we
don't need to map out the page for those cases.

Revert most of the previous attempt and keep the solution local to
arch/x86/kernel/cpu/mcheck/mce.c. Unmap the page only when:

1) there is a real error
2) memory_failure() succeeds.

All of this only applies to 64-bit systems. 32-bit kernel doesn't map
all of memory into kernel space. It isn't worth adding the code to unmap
the piece that is mapped because nobody would run a 32-bit kernel on a
machine that has recoverable machine checks.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave <dave.hansen@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert (Persistent Memory) <elliott@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Cc: stable@vger.kernel.org #v4.14
Fixes: ce0fa3e56ad2 ("x86/mm, mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agolocking/semaphore: Update the file path in documentation
Tycho Andersen [Thu, 1 Feb 2018 11:41:19 +0000 (12:41 +0100)]
locking/semaphore: Update the file path in documentation

While reading this header I noticed that the locking stuff has moved to
kernel/locking/*, so update the path in semaphore.h to point to that.

Signed-off-by: Tycho Andersen <tycho@tycho.ws>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180201114119.1090-1-tycho@tycho.ws
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agolocking/atomic/bitops: Document and clarify ordering semantics for failed test_and_...
Will Deacon [Tue, 13 Feb 2018 13:30:19 +0000 (13:30 +0000)]
locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit()

A test_and_{}_bit() operation fails if the value of the bit is such that
the modification does not take place. For example, if test_and_set_bit()
returns 1. In these cases, follow the behaviour of cmpxchg and allow the
operation to be unordered. This also applies to test_and_set_bit_lock()
if the lock is found to be be taken already.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1518528619-20049-1-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agolocking/qspinlock: Ensure node->count is updated before initialising node
Will Deacon [Tue, 13 Feb 2018 13:22:57 +0000 (13:22 +0000)]
locking/qspinlock: Ensure node->count is updated before initialising node

When queuing on the qspinlock, the count field for the current CPU's head
node is incremented. This needn't be atomic because locking in e.g. IRQ
context is balanced and so an IRQ will return with node->count as it
found it.

However, the compiler could in theory reorder the initialisation of
node[idx] before the increment of the head node->count, causing an
IRQ to overwrite the initialised node and potentially corrupt the lock
state.

Avoid the potential for this harmful compiler reordering by placing a
barrier() between the increment of the head node->count and the subsequent
node initialisation.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1518528177-19169-3-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agolocking/qspinlock: Ensure node is initialised before updating prev->next
Will Deacon [Tue, 13 Feb 2018 13:22:56 +0000 (13:22 +0000)]
locking/qspinlock: Ensure node is initialised before updating prev->next

When a locker ends up queuing on the qspinlock locking slowpath, we
initialise the relevant mcs node and publish it indirectly by updating
the tail portion of the lock word using xchg_tail. If we find that there
was a pre-existing locker in the queue, we subsequently update their
->next field to point at our node so that we are notified when it's our
turn to take the lock.

This can be roughly illustrated as follows:

  /* Initialise the fields in node and encode a pointer to node in tail */
  tail = initialise_node(node);

  /*
   * Exchange tail into the lockword using an atomic read-modify-write
   * operation with release semantics
   */
  old = xchg_tail(lock, tail);

  /* If there was a pre-existing waiter ... */
  if (old & _Q_TAIL_MASK) {
prev = decode_tail(old);
smp_read_barrier_depends();

/* ... then update their ->next field to point to node.
WRITE_ONCE(prev->next, node);
  }

The conditional update of prev->next therefore relies on the address
dependency from the result of xchg_tail ensuring order against the
prior initialisation of node. However, since the release semantics of
the xchg_tail operation apply only to the write portion of the RmW,
then this ordering is not guaranteed and it is possible for the CPU
to return old before the writes to node have been published, consequently
allowing us to point prev->next to an uninitialised node.

This patch fixes the problem by making the update of prev->next a RELEASE
operation, which also removes the reliance on dependency ordering.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1518528177-19169-2-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/error_inject: Make just_return_func() globally visible
Arnd Bergmann [Fri, 2 Feb 2018 14:56:19 +0000 (15:56 +0100)]
x86/error_inject: Make just_return_func() globally visible

With link time optimizations enabled, I get a link failure:

  ./ccLbOEHX.ltrans19.ltrans.o: In function `override_function_with_return':
  <artificial>:(.text+0x7f3): undefined reference to `just_return_func'

Marking the symbol .globl makes it work as expected.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Josef Bacik <jbacik@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicolas Pitre <nico@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: 540adea3809f ("error-injection: Separate error-injection from kprobe")
Link: http://lkml.kernel.org/r/20180202145634.200291-3-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/platform/UV: Fix GAM Range Table entries less than 1GB
mike.travis@hpe.com [Mon, 5 Feb 2018 22:15:04 +0000 (16:15 -0600)]
x86/platform/UV: Fix GAM Range Table entries less than 1GB

The latest UV platforms include the new ApachePass NVDIMMs into the
UV address space.  This has introduced address ranges in the Global
Address Map Table that are less than the previous lowest range, which
was 2GB.  Fix the address calculation so it accommodates address ranges
from bytes to exabytes.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Andrew Banman <andrew.banman@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180205221503.190219903@stormcage.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoMIPS: Fix incorrect mem=X@Y handling
Marcin Nowakowski [Thu, 1 Feb 2018 11:37:21 +0000 (12:37 +0100)]
MIPS: Fix incorrect mem=X@Y handling

Commit 73fbc1eba7ff ("MIPS: fix mem=X@Y commandline processing") added a
fix to ensure that the memory range between PHYS_OFFSET and low memory
address specified by mem= cmdline argument is not later processed by
free_all_bootmem.  This change was incorrect for systems where the
commandline specifies more than 1 mem argument, as it will cause all
memory between PHYS_OFFSET and each of the memory offsets to be marked
as reserved, which results in parts of the RAM marked as reserved
(Creator CI20's u-boot has a default commandline argument 'mem=256M@0x0
mem=768M@0x30000000').

Change the behaviour to ensure that only the range between PHYS_OFFSET
and the lowest start address of the memories is marked as protected.

This change also ensures that the range is marked protected even if it's
only defined through the devicetree and not only via commandline
arguments.

Reported-by: Mathieu Malaterre <mathieu.malaterre@gmail.com>
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@mips.com>
Fixes: 73fbc1eba7ff ("MIPS: fix mem=X@Y commandline processing")
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # v4.11+
Tested-by: Mathieu Malaterre <malat@debian.org>
Patchwork: https://patchwork.linux-mips.org/patch/18562/
Signed-off-by: James Hogan <jhogan@kernel.org>
6 years agox86/build: Add arch/x86/tools/insn_decoder_test to .gitignore
Progyan Bhattacharya [Tue, 6 Feb 2018 05:15:23 +0000 (10:45 +0530)]
x86/build: Add arch/x86/tools/insn_decoder_test to .gitignore

The file was generated by make command and should not be in the source tree.

Signed-off-by: Progyan Bhattacharya <progyanb@acm.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agosched/cpufreq: Remove unused SUGOV_KTHREAD_PRIORITY macro
Leo Yan [Thu, 8 Feb 2018 13:48:22 +0000 (21:48 +0800)]
sched/cpufreq: Remove unused SUGOV_KTHREAD_PRIORITY macro

Since schedutil kernel thread directly set priority to 0, the macro
SUGOV_KTHREAD_PRIORITY is not used.  So remove it.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vikram Mulukutla <markivx@codeaurora.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Link: http://lkml.kernel.org/r/1518097702-9665-1-git-send-email-leo.yan@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoMIPS: BMIPS: Fix section mismatch warning
Jaedon Shin [Tue, 6 Feb 2018 03:13:21 +0000 (12:13 +0900)]
MIPS: BMIPS: Fix section mismatch warning

Remove the __init annotation from bmips_cpu_setup() to avoid the
following warning.

WARNING: vmlinux.o(.text+0x35c950): Section mismatch in reference from the function brcmstb_pm_s3() to the function .init.text:bmips_cpu_setup()
The function brcmstb_pm_s3() references
the function __init bmips_cpu_setup().
This is often because brcmstb_pm_s3 lacks a __init
annotation or the annotation of bmips_cpu_setup is wrong.

Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Reviewed-by: James Hogan <jhogan@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/18589/
Signed-off-by: James Hogan <jhogan@kernel.org>
6 years agox86/smpboot: Fix uncore_pci_remove() indexing bug when hot-removing a physical CPU
Masayoshi Mizuma [Thu, 8 Feb 2018 14:19:08 +0000 (09:19 -0500)]
x86/smpboot: Fix uncore_pci_remove() indexing bug when hot-removing a physical CPU

When a physical CPU is hot-removed, the following warning messages
are shown while the uncore device is removed in uncore_pci_remove():

  WARNING: CPU: 120 PID: 5 at arch/x86/events/intel/uncore.c:988
  uncore_pci_remove+0xf1/0x110
  ...
  CPU: 120 PID: 5 Comm: kworker/u1024:0 Not tainted 4.15.0-rc8 #1
  Workqueue: kacpi_hotplug acpi_hotplug_work_fn
  ...
  Call Trace:
  pci_device_remove+0x36/0xb0
  device_release_driver_internal+0x145/0x210
  pci_stop_bus_device+0x76/0xa0
  pci_stop_root_bus+0x44/0x60
  acpi_pci_root_remove+0x1f/0x80
  acpi_bus_trim+0x54/0x90
  acpi_bus_trim+0x2e/0x90
  acpi_device_hotplug+0x2bc/0x4b0
  acpi_hotplug_work_fn+0x1a/0x30
  process_one_work+0x141/0x340
  worker_thread+0x47/0x3e0
  kthread+0xf5/0x130

When uncore_pci_remove() runs, it tries to get the package ID to
clear the value of uncore_extra_pci_dev[].dev[] by using
topology_phys_to_logical_pkg(). The warning messesages are
shown because topology_phys_to_logical_pkg() returns -1.

  arch/x86/events/intel/uncore.c:
  static void uncore_pci_remove(struct pci_dev *pdev)
  {
  ...
          phys_id = uncore_pcibus_to_physid(pdev->bus);
  ...
                  pkg = topology_phys_to_logical_pkg(phys_id); // returns -1
                  for (i = 0; i < UNCORE_EXTRA_PCI_DEV_MAX; i++) {
                          if (uncore_extra_pci_dev[pkg].dev[i] == pdev) {
                                  uncore_extra_pci_dev[pkg].dev[i] = NULL;
                                  break;
                          }
                  }
                  WARN_ON_ONCE(i >= UNCORE_EXTRA_PCI_DEV_MAX); // <=========== HERE!!

topology_phys_to_logical_pkg() tries to find
cpuinfo_x86->phys_proc_id that matches the phys_pkg argument.

  arch/x86/kernel/smpboot.c:
  int topology_phys_to_logical_pkg(unsigned int phys_pkg)
  {
          int cpu;

          for_each_possible_cpu(cpu) {
                  struct cpuinfo_x86 *c = &cpu_data(cpu);

                  if (c->initialized && c->phys_proc_id == phys_pkg)
                          return c->logical_proc_id;
          }
          return -1;
  }

However, the phys_proc_id was already set to 0 by remove_siblinginfo()
when the CPU was offlined.

So, topology_phys_to_logical_pkg() cannot find the correct
logical_proc_id and always returns -1.

As the result, uncore_pci_remove() calls WARN_ON_ONCE() and the warning
messages are shown.

What is worse is that the bogus 'pkg' index results in two bugs:

 - We dereference uncore_extra_pci_dev[] with a negative index
 - We fail to clean up a stale pointer in uncore_extra_pci_dev[][]

To fix these bugs, remove the clearing of ->phys_proc_id from remove_siblinginfo().

This should not cause any problems, because ->phys_proc_id is not
used after it is hot-removed and it is re-set while hot-adding.

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: yasu.isimatu@gmail.com
Cc: <stable@vger.kernel.org>
Fixes: 30bb9811856f ("x86/topology: Avoid wasting 128k for package id array")
Link: http://lkml.kernel.org/r/ed738d54-0f01-b38b-b794-c31dc118c207@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/powerpc: Fix to use ucontext_t instead of struct ucontext
Harish [Tue, 13 Feb 2018 06:32:55 +0000 (12:02 +0530)]
selftests/powerpc: Fix to use ucontext_t instead of struct ucontext

With glibc 2.26 'struct ucontext' is removed to improve POSIX
compliance, which breaks powerpc/alignment_handler selftest. Fix the
test by using ucontext_t. Tested on ppc, works with older glibc
versions as well.

Fixes the following:
  alignment_handler.c: In function ‘sighandler’:
  alignment_handler.c:68:5: error: dereferencing pointer to incomplete type ‘struct ucontext’
    ucp->uc_mcontext.gp_regs[PT_NIP] += 4;

Signed-off-by: Harish <harish@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/kdump: Fix powernv build break when KEXEC_CORE=n
Guenter Roeck [Mon, 12 Feb 2018 22:34:07 +0000 (14:34 -0800)]
powerpc/kdump: Fix powernv build break when KEXEC_CORE=n

If KEXEC_CORE is not enabled, powernv builds fail as follows.

  arch/powerpc/platforms/powernv/smp.c: In function 'pnv_smp_cpu_kill_self':
  arch/powerpc/platforms/powernv/smp.c:236:4: error:
   implicit declaration of function 'crash_ipi_callback'

Add dummy function calls, similar to kdump_in_progress(), to solve the
problem.

Fixes: 4145f358644b ("powernv/kdump: Fix cases where the kdump kernel can get HMI's")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/pseries: Fix build break for SPLPAR=n and CPU hotplug
Guenter Roeck [Mon, 12 Feb 2018 22:34:08 +0000 (14:34 -0800)]
powerpc/pseries: Fix build break for SPLPAR=n and CPU hotplug

Commit e67e02a544e9 ("powerpc/pseries: Fix cpu hotplug crash with
memoryless nodes") adds an unconditional call to
find_and_online_cpu_nid(), which is only declared if CONFIG_PPC_SPLPAR
is enabled. This results in the following build error if this is not
the case.

  arch/powerpc/platforms/pseries/hotplug-cpu.o: In function `dlpar_online_cpu':
  arch/powerpc/platforms/pseries/hotplug-cpu.c:369:
   undefined reference to `.find_and_online_cpu_nid'

Follow the guideline provided by similar functions and provide a dummy
function if CONFIG_PPC_SPLPAR is not enabled. This also moves the
external function declaration into an include file where it should be.

Fixes: e67e02a544e9 ("powerpc/pseries: Fix cpu hotplug crash with memoryless nodes")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
[mpe: Change subject to emphasise the build fix]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/mm/hash64: Zero PGD pages on allocation
Aneesh Kumar K.V [Tue, 13 Feb 2018 11:09:33 +0000 (16:39 +0530)]
powerpc/mm/hash64: Zero PGD pages on allocation

On powerpc we allocate page table pages from slab caches of different
sizes. Currently we have a constructor that zeroes out the objects when
we allocate them for the first time.

We expect the objects to be zeroed out when we free the the object
back to slab cache. This happens in the unmap path. For hugetlb pages
we call huge_pte_get_and_clear() to do that.

With the current configuration of page table size, both PUD and PGD
level tables are allocated from the same slab cache. At the PUD level,
we use the second half of the table to store the slot information. But
we never clear that when unmapping.

When such a freed object is then allocated for a PGD page, the second
half of the page table page will not be zeroed as expected. This
results in a kernel crash.

Fix it by always clearing PGD pages when they're allocated.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[mpe: Change log wording and formatting, add whitespace]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/mm/hash64: Store the slot information at the right offset for hugetlb
Aneesh Kumar K.V [Sun, 11 Feb 2018 15:00:08 +0000 (20:30 +0530)]
powerpc/mm/hash64: Store the slot information at the right offset for hugetlb

The hugetlb pte entries are at the PMD and PUD level, so we can't use
PTRS_PER_PTE to find the second half of the page table. Use the right
offset for PUD/PMD to get to the second half of the table.

Fixes: bf9a95f9a648 ("powerpc: Free up four 64K PTE bits in 64K backed HPTE pages")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/mm/hash64: Allocate larger PMD table if hugetlb config is enabled
Aneesh Kumar K.V [Sun, 11 Feb 2018 15:00:07 +0000 (20:30 +0530)]
powerpc/mm/hash64: Allocate larger PMD table if hugetlb config is enabled

We use the second half of the page table to store slot information, so we must
allocate it always if hugetlb is possible.

Fixes: bf9a95f9a648 ("powerpc: Free up four 64K PTE bits in 64K backed HPTE pages")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/mm: Fix crashes with 16G huge pages
Aneesh Kumar K.V [Sun, 11 Feb 2018 15:00:06 +0000 (20:30 +0530)]
powerpc/mm: Fix crashes with 16G huge pages

To support memory keys, we moved the hash pte slot information to the
second half of the page table. This was ok with PTE entries at level
4 (PTE page) and level 3 (PMD). We already allocate larger page table
pages at those levels to accomodate extra details. For level 4 we
already have the extra space which was used to track 4k hash page
table entry details and at level 3 the extra space was allocated to
track the THP details.

With hugetlbfs PTE, we used this extra space at the PMD level to store
the slot details. But we also support hugetlbfs PTE at PUD level for
16GB pages and PUD level page didn't allocate extra space. This
resulted in memory corruption.

Fix this by allocating extra space at PUD level when HUGETLB is
enabled.

Fixes: bf9a95f9a648 ("powerpc: Free up four 64K PTE bits in 64K backed HPTE pages")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/mm: Flush radix process translations when setting MMU type
Alexey Kardashevskiy [Thu, 1 Feb 2018 05:09:44 +0000 (16:09 +1100)]
powerpc/mm: Flush radix process translations when setting MMU type

Radix guests do normally invalidate process-scoped translations when a
new pid is allocated but migrated guests do not invalidate these so
migrated guests crash sometime, especially easy to reproduce with
migration happening within first 10 seconds after the guest boot start
on the same machine.

This adds the "Invalidate process-scoped translations" flush to fix
radix guests migration.

Fixes: 2ee13be34b13 ("KVM: PPC: Book3S HV: Update kvmppc_set_arch_compat() for ISA v3.00")
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/vas: Don't set uses_vas for kernel windows
Nicholas Piggin [Thu, 8 Feb 2018 09:18:38 +0000 (19:18 +1000)]
powerpc/vas: Don't set uses_vas for kernel windows

cp_abort is only required for user windows, because kernel context
must not be preempted between a copy/paste pair.

Without this patch, the init task gets used_vas set when it runs the
nx842_powernv_init initcall, which opens windows for kernel usage.

used_vas is then never cleared anywhere, so it gets propagated into
all other tasks. It's a property of the address space, so it should
really be cleared when a new mm is created (or in dup_mmap if the
mmaps are marked as VM_DONTCOPY). For now we seem to have no such
driver, so leave that for another patch.

Fixes: 6c8e6bb2a52d ("powerpc/vas: Add support for user receive window")
Cc: stable@vger.kernel.org # v4.15+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agopowerpc/pseries: Enable RAS hotplug events later
Sam Bobroff [Mon, 12 Feb 2018 00:19:29 +0000 (11:19 +1100)]
powerpc/pseries: Enable RAS hotplug events later

Currently if the kernel receives a memory hot-unplug event early
enough, it may get stuck in an infinite loop in
dissolve_free_huge_pages(). This appears as a stall just after:

  pseries-hotplug-mem: Attempting to hot-remove XX LMB(s) at YYYYYYYY

It appears to be caused by "minimum_order" being uninitialized, due to
init_ras_IRQ() executing before hugetlb_init().

To correct this, extract the part of init_ras_IRQ() that enables
hotplug event processing and place it in the machine_late_initcall
phase, which is guaranteed to be after hugetlb_init() is called.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
[mpe: Reorder the functions to make the diff readable]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
6 years agosched/core: Fix DEBUG_SPINLOCK annotation for rq->lock
Peter Zijlstra [Tue, 6 Feb 2018 16:52:13 +0000 (17:52 +0100)]
sched/core: Fix DEBUG_SPINLOCK annotation for rq->lock

Mark noticed that he had sporadic "spinlock recursion" warnings from
the DEBUG_SPINLOCK code. Now rq->lock is special in that the owner
changes in the middle of a context switch.

It so happens that we fix up the lock.owner too late, @prev can run
(remotely) the moment prev->on_cpu is cleared, this then allows @prev
to again try and acquire this rq->lock and trigger this warning.

So we have to switch lock.owner before clearing prev->on_cpu.

Do this by moving the DEBUG_SPINLOCK annotation from after switch_to()
to before switch_to() and collect all lockdep annotations there into
prepare_lock_switch() to mirror the existing finish_lock_switch().

Debugged-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agosched/rt: Make update_curr_rt() more accurate
Wen Yang [Tue, 6 Feb 2018 01:53:28 +0000 (09:53 +0800)]
sched/rt: Make update_curr_rt() more accurate

rq->clock_task may be updated between the two calls of
rq_clock_task() in update_curr_rt(). Calling rq_clock_task() only
once makes it more accurate and efficient, taking update_curr() as
reference.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: zhong.weidong@zte.com.cn
Link: http://lkml.kernel.org/r/1517882008-44552-1-git-send-email-wen.yang99@zte.com.cn
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agosched/deadline: Make update_curr_dl() more accurate
Wen Yang [Tue, 6 Feb 2018 01:55:48 +0000 (09:55 +0800)]
sched/deadline: Make update_curr_dl() more accurate

rq->clock_task may be updated between the two calls of
rq_clock_task() in update_curr_dl(). Calling rq_clock_task() only
once makes it more accurate and efficient, taking update_curr() as
reference.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: zhong.weidong@zte.com.cn
Link: http://lkml.kernel.org/r/1517882148-44599-1-git-send-email-wen.yang99@zte.com.cn
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agox86/mm/kcore: Add vsyscall page to /proc/kcore conditionally
Jia Zhang [Mon, 12 Feb 2018 14:44:54 +0000 (22:44 +0800)]
x86/mm/kcore: Add vsyscall page to /proc/kcore conditionally

The vsyscall page should be visible only if vsyscall=emulate/native when dumping /proc/kcore.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1518446694-21124-3-git-send-email-zhang.jia@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agovfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page
Jia Zhang [Mon, 12 Feb 2018 14:44:53 +0000 (22:44 +0800)]
vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page

Commit:

  df04abfd181a ("fs/proc/kcore.c: Add bounce buffer for ktext data")

... introduced a bounce buffer to work around CONFIG_HARDENED_USERCOPY=y.
However, accessing the vsyscall user page will cause an SMAP fault.

Replace memcpy() with copy_from_user() to fix this bug works, but adding
a common way to handle this sort of user page may be useful for future.

Currently, only vsyscall page requires KCORE_USER.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1518446694-21124-2-git-send-email-zhang.jia@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c
Dominik Brodowski [Sun, 11 Feb 2018 11:10:11 +0000 (12:10 +0100)]
selftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c

On 64-bit builds, we should not rely on "int $0x80" working (it only does if
CONFIG_IA32_EMULATION=y is enabled).

Without this patch, the move test may succeed, but the "int $0x80" causes
a segfault, resulting in a false negative output of this self-test.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kselftest@vger.kernel.org
Cc: shuah@kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-4-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86: Fix build bug caused by the 5lvl test which has been moved to the...
Dominik Brodowski [Sun, 11 Feb 2018 11:10:09 +0000 (12:10 +0100)]
selftests/x86: Fix build bug caused by the 5lvl test which has been moved to the VM directory

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kselftest@vger.kernel.org
Cc: shuah@kernel.org
Fixes: 235266b8e11c "selftests/vm: move 128TB mmap boundary test to generic directory"
Link: http://lkml.kernel.org/r/20180211111013.16888-2-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86/pkeys: Remove unused functions
Ingo Molnar [Tue, 13 Feb 2018 07:26:17 +0000 (08:26 +0100)]
selftests/x86/pkeys: Remove unused functions

This also gets rid of two build warnings:

  protection_keys.c: In function ‘dumpit’:
  protection_keys.c:419:3: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
     write(1, buf, nr_read);
     ^~~~~~~~~~~~~~~~~~~~~~

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
6 years agoselftests/x86: Clean up and document sscanf() usage
Dominik Brodowski [Sun, 11 Feb 2018 20:59:24 +0000 (21:59 +0100)]
selftests/x86: Clean up and document sscanf() usage

Replace a couple of magically connected buffer length literal constants with
a common definition that makes their relationship obvious. Also document
why our sscanf() usage is safe.

No intended functional changes.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Andrew Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kselftest@vger.kernel.org
Cc: shuah@kernel.org
Link: http://lkml.kernel.org/r/20180211205924.GA23210@light.dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>