Using kasan_reset_tag() currently results in a function call. As it's called quite often from the allocator code this leads to a noticeable slowdown. Move it to include/linux/kasan.h and turn it into a static inline function.
Signed-off-by: Andrey Konovalov <andreyk...@google.com> Link: https://linux-review.googlesource.com/id/I4d2061acfe91d480a75df00b07c22d8494ef14b5 --- include/linux/kasan.h | 5 ++++- mm/kasan/hw_tags.c | 5 ----- mm/kasan/kasan.h | 6 ++---- mm/kasan/sw_tags.c | 5 ----- 4 files changed, 6 insertions(+), 15 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 93d9834b7122..6377d7d3a951 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -187,7 +187,10 @@ static inline void kasan_record_aux_stack(void *ptr) {} void __init kasan_init_tags(void); -void *kasan_reset_tag(const void *addr); +static inline void *kasan_reset_tag(const void *addr) +{ + return (void *)arch_kasan_reset_tag(addr); +} bool kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip); diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index b372421258c8..c3a0e83b5e7a 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -24,11 +24,6 @@ void __init kasan_init_tags(void) pr_info("KernelAddressSanitizer initialized\n"); } -void *kasan_reset_tag(const void *addr) -{ - return reset_tag(addr); -} - void kasan_poison_memory(const void *address, size_t size, u8 value) { set_mem_tag_range(reset_tag(address), diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 456b264e5124..0ccbb3c4c519 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -246,15 +246,13 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) return addr; } #endif -#ifndef arch_kasan_reset_tag -#define arch_kasan_reset_tag(addr) ((void *)(addr)) -#endif #ifndef arch_kasan_get_tag #define arch_kasan_get_tag(addr) 0 #endif +/* kasan_reset_tag() defined in include/linux/kasan.h. */ +#define reset_tag(addr) ((void *)kasan_reset_tag(addr)) #define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag))) -#define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr)) #define get_tag(addr) arch_kasan_get_tag(addr) #ifndef arch_init_tags diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c index 099af6dc8f7e..4db41f274702 100644 --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -67,11 +67,6 @@ u8 random_tag(void) return (u8)(state % (KASAN_TAG_MAX + 1)); } -void *kasan_reset_tag(const void *addr) -{ - return reset_tag(addr); -} - bool check_memory_region(unsigned long addr, size_t size, bool write, unsigned long ret_ip) { -- 2.29.0.rc1.297.gfa9743e501-goog
