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mm: page-flags-layout.h: change the KASAN_TAG_WIDTH for HW_TAGS

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KASAN_TAG_WIDTH is 8 bits for both (HW_TAGS and SW_TAGS), but for HW_TAGS
the KASAN_TAG_WIDTH can be 4 bits bits because due to the design of the
MTE the memory words for storing metadata only need 4 bits.  Change the
preprocessor define KASAN_TAG_WIDTH for check if SW_TAGS is define, so
KASAN_TAG_WIDTH should be 8 bits, but if HW_TAGS is define, so
KASAN_TAG_WIDTH should be 4 bits to save a few flags bits.

Link: https://lkml.kernel.org/r/20250428201409.5482-1-trintaeoitogc@gmail.com
Signed-off-by: Guilherme Giacomo Simoes <trintaeoitogc@gmail.com>
Suggested-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Guilherme Giacomo Simoes
2025-04-28 17:14:09 -03:00
committed by Andrew Morton
parent 3e43e260f1
commit 69eadd6a05
1 changed files with 3 additions and 1 deletions
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4
include/linux/page-flags-layout.h
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@@ -72,8 +72,10 @@
#define NODE_NOT_IN_PAGE_FLAGS 1
#endif
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
#if defined(CONFIG_KASAN_SW_TAGS)
#define KASAN_TAG_WIDTH 8
#elif defined(CONFIG_KASAN_HW_TAGS)
#define KASAN_TAG_WIDTH 4
#else
#define KASAN_TAG_WIDTH 0
#endif