Merge branch 'akpm' (patches from Andrew)

Merge KASAN updates from Andrew Morton.

This adds a new hardware tag-based mode to KASAN.  The new mode is
similar to the existing software tag-based KASAN, but relies on arm64
Memory Tagging Extension (MTE) to perform memory and pointer tagging
(instead of shadow memory and compiler instrumentation).

By Andrey Konovalov and Vincenzo Frascino.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (60 commits)
  kasan: update documentation
  kasan, mm: allow cache merging with no metadata
  kasan: sanitize objects when metadata doesn't fit
  kasan: clarify comment in __kasan_kfree_large
  kasan: simplify assign_tag and set_tag calls
  kasan: don't round_up too much
  kasan, mm: rename kasan_poison_kfree
  kasan, mm: check kasan_enabled in annotations
  kasan: add and integrate kasan boot parameters
  kasan: inline (un)poison_range and check_invalid_free
  kasan: open-code kasan_unpoison_slab
  kasan: inline random_tag for HW_TAGS
  kasan: inline kasan_reset_tag for tag-based modes
  kasan: remove __kasan_unpoison_stack
  kasan: allow VMAP_STACK for HW_TAGS mode
  kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK
  kasan: introduce set_alloc_info
  kasan: rename get_alloc/free_info
  kasan: simplify quarantine_put call site
  kselftest/arm64: check GCR_EL1 after context switch
  ...

diff --cc Documentation/dev-tools/kasan.rst
index 748149b,e03513f..0fc3fb1
--- 1/Documentation/dev-tools/kasan.rst
--- 2/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@@ -18,8 -21,8 +21,8 @@@ out-of-bounds accesses for global varia
  
  Tag-based KASAN is only supported in Clang.
  
 -Currently generic KASAN is supported for the x86_64, arm64, xtensa, s390 and
 +Currently generic KASAN is supported for the x86_64, arm, arm64, xtensa, s390
- and riscv architectures, and tag-based KASAN is supported only for arm64.
+ and riscv architectures, and tag-based KASAN modes are supported only for arm64.
  
  Usage
  -----