2021-02-05 19:28:44

by Andrey Konovalov

Subject: [PATCH v3 mm 11/13] kasan: inline HW_TAGS helper functions

Mark all static functions in common.c and kasan.h that are used for
hardware tag-based KASAN as inline to avoid unnecessary function calls.

Signed-off-by: Andrey Konovalov <[email protected]>
---
mm/kasan/common.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 7ffb1e6de2ef..7b53291dafa1 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -279,7 +279,8 @@ void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
* based on objects indexes, so that objects that are next to each other
* get different tags.
*/
-static u8 assign_tag(struct kmem_cache *cache, const void *object, bool init)
+static inline u8 assign_tag(struct kmem_cache *cache,
+ const void *object, bool init)
{
if (IS_ENABLED(CONFIG_KASAN_GENERIC))
return 0xff;
@@ -321,8 +322,8 @@ void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
return (void *)object;
}

-static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
- unsigned long ip, bool quarantine)
+static inline bool ____kasan_slab_free(struct kmem_cache *cache,
+ void *object, unsigned long ip, bool quarantine)
{
u8 tag;
void *tagged_object;
@@ -366,7 +367,7 @@ bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
return ____kasan_slab_free(cache, object, ip, true);
}

-static bool ____kasan_kfree_large(void *ptr, unsigned long ip)
+static inline bool ____kasan_kfree_large(void *ptr, unsigned long ip)
{
if (ptr != page_address(virt_to_head_page(ptr))) {
kasan_report_invalid_free(ptr, ip);
@@ -461,8 +462,8 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
return tagged_object;
}

-static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object,
- size_t size, gfp_t flags)
+static inline void *____kasan_kmalloc(struct kmem_cache *cache,
+ const void *object, size_t size, gfp_t flags)
{
unsigned long redzone_start;
unsigned long redzone_end;
--
2.30.0.365.g02bc693789-goog

2021-02-08 11:14:57

by Marco Elver

Subject: Re: [PATCH v3 mm 11/13] kasan: inline HW_TAGS helper functions

On Fri, Feb 05, 2021 at 06:34PM +0100, Andrey Konovalov wrote:
> Mark all static functions in common.c and kasan.h that are used for
> hardware tag-based KASAN as inline to avoid unnecessary function calls.
>
> Signed-off-by: Andrey Konovalov <[email protected]>

Reviewed-by: Marco Elver <[email protected]>

> ---
> mm/kasan/common.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index 7ffb1e6de2ef..7b53291dafa1 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -279,7 +279,8 @@ void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
> * based on objects indexes, so that objects that are next to each other
> * get different tags.
> */
> -static u8 assign_tag(struct kmem_cache *cache, const void *object, bool init)
> +static inline u8 assign_tag(struct kmem_cache *cache,
> + const void *object, bool init)
> {
> if (IS_ENABLED(CONFIG_KASAN_GENERIC))
> return 0xff;
> @@ -321,8 +322,8 @@ void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
> return (void *)object;
> }
>
> -static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
> - unsigned long ip, bool quarantine)
> +static inline bool ____kasan_slab_free(struct kmem_cache *cache,
> + void *object, unsigned long ip, bool quarantine)
> {
> u8 tag;
> void *tagged_object;
> @@ -366,7 +367,7 @@ bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
> return ____kasan_slab_free(cache, object, ip, true);
> }
>
> -static bool ____kasan_kfree_large(void *ptr, unsigned long ip)
> +static inline bool ____kasan_kfree_large(void *ptr, unsigned long ip)
> {
> if (ptr != page_address(virt_to_head_page(ptr))) {
> kasan_report_invalid_free(ptr, ip);
> @@ -461,8 +462,8 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
> return tagged_object;
> }
>
> -static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object,
> - size_t size, gfp_t flags)
> +static inline void *____kasan_kmalloc(struct kmem_cache *cache,
> + const void *object, size_t size, gfp_t flags)
> {
> unsigned long redzone_start;
> unsigned long redzone_end;
> --
> 2.30.0.365.g02bc693789-goog
>