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UPSTREAM: mm/slab: factor out debugging initialization in cache_init_objs()

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cache_init_objs() will be changed in following patch and current form
doesn't fit well for that change.  So, before doing it, this patch
separates debugging initialization.  This would cause two loop iteration
when debugging is enabled, but, this overhead seems too light than debug
feature itself so effect may not be visible.  This patch will greatly
simplify changes in cache_init_objs() in following patch.

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>

Bug: 64145065
(cherry-picked from 10b2e9e8e8)
Change-Id: I9904974a674f17fc7d57daf0fe351742db67c006
Signed-off-by: Paul Lawrence <paullawrence@google.com>
This commit is contained in:
Joonsoo Kim
2016-03-15 14:54:47 -07:00
committed by Amit Pundir
parent a04e6a42ce
commit b06244f737
1 changed files with 18 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
mm/slab.c
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@@ -2483,14 +2483,14 @@ static inline void set_free_obj(struct page *page,
((freelist_idx_t *)(page->freelist))[idx] = val;
}
static void cache_init_objs(struct kmem_cache *cachep,
struct page *page)
static void cache_init_objs_debug(struct kmem_cache *cachep, struct page *page)
{
#if DEBUG
int i;
for (i = 0; i < cachep->num; i++) {
void *objp = index_to_obj(cachep, page, i);
#if DEBUG
if (cachep->flags & SLAB_STORE_USER)
*dbg_userword(cachep, objp) = NULL;
@@ -2519,10 +2519,22 @@ static void cache_init_objs(struct kmem_cache *cachep,
poison_obj(cachep, objp, POISON_FREE);
slab_kernel_map(cachep, objp, 0, 0);
}
#else
if (cachep->ctor)
cachep->ctor(objp);
}
#endif
}
static void cache_init_objs(struct kmem_cache *cachep,
struct page *page)
{
int i;
cache_init_objs_debug(cachep, page);
for (i = 0; i < cachep->num; i++) {
/* constructor could break poison info */
if (DEBUG == 0 && cachep->ctor)
cachep->ctor(index_to_obj(cachep, page, i));
set_free_obj(page, i, i);
}
}