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author | Joonsoo Kim <iamjoonsoo.kim@lge.com> | 2016-03-16 00:54:27 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-16 02:55:16 +0300 |
commit | 249247b6f8ee362189a2f2bf598a14ff6c95fb4c (patch) | |
tree | bcf211d6446ff1cc56996423ba42a2b4734e7c86 /mm/slab.c | |
parent | d31676dfde257cb2b3e52d4e657d8ad2251e4d49 (diff) | |
download | linux-249247b6f8ee362189a2f2bf598a14ff6c95fb4c.tar.xz |
mm/slab: remove object status buffer for DEBUG_SLAB_LEAK
Now, we don't use object status buffer in any setup. Remove it.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab.c')
-rw-r--r-- | mm/slab.c | 34 |
1 files changed, 2 insertions, 32 deletions
diff --git a/mm/slab.c b/mm/slab.c index 907abe9964bf..02be9d9776ad 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -380,22 +380,8 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp) #endif -#define OBJECT_FREE (0) -#define OBJECT_ACTIVE (1) - #ifdef CONFIG_DEBUG_SLAB_LEAK -static void set_obj_status(struct page *page, int idx, int val) -{ - int freelist_size; - char *status; - struct kmem_cache *cachep = page->slab_cache; - - freelist_size = cachep->num * sizeof(freelist_idx_t); - status = (char *)page->freelist + freelist_size; - status[idx] = val; -} - static inline bool is_store_user_clean(struct kmem_cache *cachep) { return atomic_read(&cachep->store_user_clean) == 1; @@ -413,7 +399,6 @@ static inline void set_store_user_dirty(struct kmem_cache *cachep) } #else -static inline void set_obj_status(struct page *page, int idx, int val) {} static inline void set_store_user_dirty(struct kmem_cache *cachep) {} #endif @@ -476,9 +461,6 @@ static size_t calculate_freelist_size(int nr_objs, size_t align) size_t freelist_size; freelist_size = nr_objs * sizeof(freelist_idx_t); - if (IS_ENABLED(CONFIG_DEBUG_SLAB_LEAK)) - freelist_size += nr_objs * sizeof(char); - if (align) freelist_size = ALIGN(freelist_size, align); @@ -491,10 +473,7 @@ static int calculate_nr_objs(size_t slab_size, size_t buffer_size, int nr_objs; size_t remained_size; size_t freelist_size; - int extra_space = 0; - if (IS_ENABLED(CONFIG_DEBUG_SLAB_LEAK)) - extra_space = sizeof(char); /* * Ignore padding for the initial guess. The padding * is at most @align-1 bytes, and @buffer_size is at @@ -503,7 +482,7 @@ static int calculate_nr_objs(size_t slab_size, size_t buffer_size, * into the memory allocation when taking the padding * into account. */ - nr_objs = slab_size / (buffer_size + idx_size + extra_space); + nr_objs = slab_size / (buffer_size + idx_size); /* * This calculated number will be either the right @@ -1961,16 +1940,13 @@ static size_t calculate_slab_order(struct kmem_cache *cachep, break; if (flags & CFLGS_OFF_SLAB) { - size_t freelist_size_per_obj = sizeof(freelist_idx_t); /* * Max number of objs-per-slab for caches which * use off-slab slabs. Needed to avoid a possible * looping condition in cache_grow(). */ - if (IS_ENABLED(CONFIG_DEBUG_SLAB_LEAK)) - freelist_size_per_obj += sizeof(char); offslab_limit = size; - offslab_limit /= freelist_size_per_obj; + offslab_limit /= sizeof(freelist_idx_t); if (num > offslab_limit) break; @@ -2533,7 +2509,6 @@ static void cache_init_objs(struct kmem_cache *cachep, if (cachep->ctor) cachep->ctor(objp); #endif - set_obj_status(page, i, OBJECT_FREE); set_free_obj(page, i, i); } } @@ -2745,7 +2720,6 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, BUG_ON(objnr >= cachep->num); BUG_ON(objp != index_to_obj(cachep, page, objnr)); - set_obj_status(page, objnr, OBJECT_FREE); if (cachep->flags & SLAB_POISON) { poison_obj(cachep, objp, POISON_FREE); slab_kernel_map(cachep, objp, 0, caller); @@ -2878,8 +2852,6 @@ static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, gfp_t flags, void *objp, unsigned long caller) { - struct page *page; - if (!objp) return objp; if (cachep->flags & SLAB_POISON) { @@ -2904,8 +2876,6 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, *dbg_redzone2(cachep, objp) = RED_ACTIVE; } - page = virt_to_head_page(objp); - set_obj_status(page, obj_to_index(cachep, page, objp), OBJECT_ACTIVE); objp += obj_offset(cachep); if (cachep->ctor && cachep->flags & SLAB_POISON) cachep->ctor(objp); |