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author | Andrey Konovalov <andreyknvl@google.com> | 2023-12-21 23:04:43 +0300 |
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committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 22:58:43 +0300 |
commit | 27232ba96cfbc6b9bdb363231c9c31305bb9a2bc (patch) | |
tree | 5e99b5389f9a63bd2a598b2b4ce1ab50dad99ac3 /arch/arm64/include/asm/kasan.h | |
parent | 51fb591edc867a11c7fcebfa88298e7ccdb61265 (diff) | |
download | linux-27232ba96cfbc6b9bdb363231c9c31305bb9a2bc.tar.xz |
kasan/arm64: improve comments for KASAN_SHADOW_START/END
Patch series "kasan: assorted clean-ups".
Code clean-ups, nothing worthy of being backported to stable.
This patch (of 11):
Unify and improve the comments for KASAN_SHADOW_START/END definitions from
include/asm/kasan.h and include/asm/memory.h.
Also put both definitions together in include/asm/memory.h.
Also clarify the related BUILD_BUG_ON checks in mm/kasan_init.c.
Link: https://lkml.kernel.org/r/cover.1703188911.git.andreyknvl@google.com
Link: https://lkml.kernel.org/r/140108ca0b164648c395a41fbeecb0601b1ae9e1.1703188911.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/arm64/include/asm/kasan.h')
-rw-r--r-- | arch/arm64/include/asm/kasan.h | 22 |
1 files changed, 1 insertions, 21 deletions
diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h index 12d5f47f7dbe..7eefc525a9df 100644 --- a/arch/arm64/include/asm/kasan.h +++ b/arch/arm64/include/asm/kasan.h @@ -15,29 +15,9 @@ #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) +asmlinkage void kasan_early_init(void); void kasan_init(void); - -/* - * KASAN_SHADOW_START: beginning of the kernel virtual addresses. - * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses, - * where N = (1 << KASAN_SHADOW_SCALE_SHIFT). - * - * KASAN_SHADOW_OFFSET: - * This value is used to map an address to the corresponding shadow - * address by the following formula: - * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET - * - * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range - * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual - * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation: - * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - - * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT)) - */ -#define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT))) -#define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual) - void kasan_copy_shadow(pgd_t *pgdir); -asmlinkage void kasan_early_init(void); #else static inline void kasan_init(void) { } |