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Subject[PATCH v2 1/3] kasan, arm64: use ARCH_SLAB_MINALIGN instead of manual aligning
Date
Instead of changing cache->align to be aligned to KASAN_SHADOW_SCALE_SIZE
in kasan_cache_create() we can reuse the ARCH_SLAB_MINALIGN macro.

Suggested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
arch/arm64/include/asm/kasan.h | 4 ++++
include/linux/slab.h | 1 +
mm/kasan/common.c | 2 --
3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h
index b52aacd2c526..ba26150d578d 100644
--- a/arch/arm64/include/asm/kasan.h
+++ b/arch/arm64/include/asm/kasan.h
@@ -36,6 +36,10 @@
#define KASAN_SHADOW_OFFSET (KASAN_SHADOW_END - (1ULL << \
(64 - KASAN_SHADOW_SCALE_SHIFT)))

+#ifdef CONFIG_KASAN_SW_TAGS
+#define ARCH_SLAB_MINALIGN (1ULL << KASAN_SHADOW_SCALE_SHIFT)
+#endif
+
void kasan_init(void);
void kasan_copy_shadow(pgd_t *pgdir);
asmlinkage void kasan_early_init(void);
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 11b45f7ae405..d87f913ab4e8 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -16,6 +16,7 @@
#include <linux/overflow.h>
#include <linux/types.h>
#include <linux/workqueue.h>
+#include <linux/kasan.h>


/*
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 03d5d1374ca7..44390392d4c9 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -298,8 +298,6 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
return;
}

- cache->align = round_up(cache->align, KASAN_SHADOW_SCALE_SIZE);
-
*flags |= SLAB_KASAN;
}

--
2.20.1.415.g653613c723-goog
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