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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>
This commit is contained in:
Joonsoo Kim 2016-03-15 14:54:27 -07:00 committed by Linus Torvalds
parent d31676dfde
commit 249247b6f8
1 changed files with 2 additions and 32 deletions
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34
mm/slab.c
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@ -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);