diff options
| author | Guilherme Giacomo Simoes <trintaeoitogc@gmail.com> | 2025-04-28 17:14:09 -0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-05-12 23:50:49 -0700 |
| commit | 69eadd6a05409ca3725cabf8d60ccf6c8f87e193 (patch) | |
| tree | 953ebb87b9b75eded20278176265b5eda6581072 | |
| parent | 3e43e260f1e44d21861815faa905a1829027600f (diff) | |
mm: page-flags-layout.h: change the KASAN_TAG_WIDTH for HW_TAGS
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>
| -rw-r--r-- | include/linux/page-flags-layout.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/page-flags-layout.h b/include/linux/page-flags-layout.h index 4f5c9e979bb9..760006b1c480 100644 --- a/include/linux/page-flags-layout.h +++ b/include/linux/page-flags-layout.h @@ -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 |