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Subject[PATCH v2 00/12] kasan: optimizations and fixes for HW_TAGS
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This patchset goes on top of:

1. Vincenzo's async support patches [1], and
2. "kasan: untag addresses for KFENCE" fix [2] (already in mm).

[1] https://lore.kernel.org/linux-arm-kernel/20210130165225.54047-1-vincenzo.frascino@arm.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=akpm&id=dec4728fab910da0c86cf9a97e980f4244ebae9f

This patchset makes the HW_TAGS mode more efficient, mostly by reworking
poisoning approaches and simplifying/inlining some internal helpers.

With this change, the overhead of HW_TAGS annotations excluding setting
and checking memory tags is ~3%. The performance impact caused by tags
will be unknown until we have hardware that supports MTE.

As a side-effect, this patchset speeds up generic KASAN by ~15%.

Andrey Konovalov (12):
kasan, mm: don't save alloc stacks twice
kasan, mm: optimize kmalloc poisoning
kasan: optimize large kmalloc poisoning
kasan: clean up setting free info in kasan_slab_free
kasan: unify large kfree checks
kasan: rework krealloc tests
kasan, mm: fail krealloc on freed objects
kasan, mm: optimize krealloc poisoning
kasan: ensure poisoning size alignment
arm64: kasan: simplify and inline MTE functions
kasan: inline HW_TAGS helper functions
arm64: kasan: export MTE symbols for KASAN tests

arch/arm64/include/asm/cache.h | 1 -
arch/arm64/include/asm/kasan.h | 1 +
arch/arm64/include/asm/mte-def.h | 2 +
arch/arm64/include/asm/mte-kasan.h | 65 ++++++++--
arch/arm64/include/asm/mte.h | 2 -
arch/arm64/kernel/mte.c | 48 +-------
arch/arm64/lib/mte.S | 16 ---
include/linux/kasan.h | 25 ++--
lib/test_kasan.c | 111 +++++++++++++++--
mm/kasan/common.c | 187 ++++++++++++++++++++---------
mm/kasan/kasan.h | 72 +++++++++--
mm/kasan/shadow.c | 53 ++++----
mm/slab_common.c | 18 ++-
mm/slub.c | 3 +-
14 files changed, 418 insertions(+), 186 deletions(-)

--
2.30.0.365.g02bc693789-goog

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