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SubjectRe: [PATCH v2 14/20] kasan, mm: rename kasan_poison_kfree
On Tue, Nov 10, 2020 at 11:20PM +0100, Andrey Konovalov wrote:
> Rename kasan_poison_kfree() to kasan_slab_free_mempool() as it better
> reflects what this annotation does.

This function is again so simple, and now it seems it's mempool
specific, can't we just remove it and open-code it in mempool.c?

> No functional changes.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
> Link: https://linux-review.googlesource.com/id/I5026f87364e556b506ef1baee725144bb04b8810
> ---
> include/linux/kasan.h | 16 ++++++++--------
> mm/kasan/common.c | 16 ++++++++--------
> mm/mempool.c | 2 +-
> 3 files changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
> index 779f8e703982..534ab3e2935a 100644
> --- a/include/linux/kasan.h
> +++ b/include/linux/kasan.h
> @@ -177,6 +177,13 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned
> return false;
> }
>
> +void __kasan_slab_free_mempool(void *ptr, unsigned long ip);
> +static inline void kasan_slab_free_mempool(void *ptr, unsigned long ip)
> +{
> + if (kasan_enabled())
> + __kasan_slab_free_mempool(ptr, ip);
> +}
> +
> void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
> void *object, gfp_t flags);
> static inline void * __must_check kasan_slab_alloc(struct kmem_cache *s,
> @@ -217,13 +224,6 @@ static inline void * __must_check kasan_krealloc(const void *object,
> return (void *)object;
> }
>
> -void __kasan_poison_kfree(void *ptr, unsigned long ip);
> -static inline void kasan_poison_kfree(void *ptr, unsigned long ip)
> -{
> - if (kasan_enabled())
> - __kasan_poison_kfree(ptr, ip);
> -}
> -
> void __kasan_kfree_large(void *ptr, unsigned long ip);
> static inline void kasan_kfree_large(void *ptr, unsigned long ip)
> {
> @@ -263,6 +263,7 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
> {
> return false;
> }
> +static inline void kasan_slab_free_mempool(void *ptr, unsigned long ip) {}
> static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
> gfp_t flags)
> {
> @@ -282,7 +283,6 @@ static inline void *kasan_krealloc(const void *object, size_t new_size,
> {
> return (void *)object;
> }
> -static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
> static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
>
> #endif /* CONFIG_KASAN */
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index 819403548f2e..60793f8695a8 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -336,6 +336,14 @@ bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
> return ____kasan_slab_free(cache, object, ip, true);
> }
>
> +void __kasan_slab_free_mempool(void *ptr, unsigned long ip)
> +{
> + struct page *page;
> +
> + page = virt_to_head_page(ptr);
> + ____kasan_slab_free(page->slab_cache, ptr, ip, false);
> +}
> +
> static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
> {
> kasan_set_track(&kasan_get_alloc_meta(cache, object)->alloc_track, flags);
> @@ -427,14 +435,6 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
> flags, true);
> }
>
> -void __kasan_poison_kfree(void *ptr, unsigned long ip)
> -{
> - struct page *page;
> -
> - page = virt_to_head_page(ptr);
> - ____kasan_slab_free(page->slab_cache, ptr, ip, false);
> -}
> -
> void __kasan_kfree_large(void *ptr, unsigned long ip)
> {
> if (ptr != page_address(virt_to_head_page(ptr)))
> diff --git a/mm/mempool.c b/mm/mempool.c
> index f473cdddaff0..b1f39fa75ade 100644
> --- a/mm/mempool.c
> +++ b/mm/mempool.c
> @@ -104,7 +104,7 @@ static inline void poison_element(mempool_t *pool, void *element)
> static __always_inline void kasan_poison_element(mempool_t *pool, void *element)
> {
> if (pool->alloc == mempool_alloc_slab || pool->alloc == mempool_kmalloc)
> - kasan_poison_kfree(element, _RET_IP_);
> + kasan_slab_free_mempool(element, _RET_IP_);

This is already a kasan-prefixed function, so if
kasan_slab_free_mempool() is only ever called in this function, we
should just call kasan_slab_free() here directly with the 2 extra args
it requires open-coded.

> else if (pool->alloc == mempool_alloc_pages)
> kasan_free_pages(element, (unsigned long)pool->pool_data);
> }

Thanks,
-- Marco

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