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mm/slab: remove the checks for slab implementation bug 

Some of "#if DEBUG" are for reporting slab implementation bug rather
than user usecase bug.  It's not really needed because slab is stable
for a quite long time and it makes code too dirty.  This patch remove
it.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: 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 14:54:12 -07:00 committed by Linus Torvalds
parent 6fb924304a
commit 260b61dd46
1 changed files with 7 additions and 22 deletions
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29
mm/slab.c
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@ -2110,8 +2110,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
if (!(flags & SLAB_DESTROY_BY_RCU))
flags |= SLAB_POISON;
#endif
if (flags & SLAB_DESTROY_BY_RCU)
BUG_ON(flags & SLAB_POISON);
#endif
/*
@ -2368,9 +2366,6 @@ static int drain_freelist(struct kmem_cache *cache,
}
page = list_entry(p, struct page, lru);
#if DEBUG
BUG_ON(page->active);
#endif
list_del(&page->lru);
/*
* Safe to drop the lock. The slab is no longer linked
@ -2528,30 +2523,23 @@ static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
}
}
static void *slab_get_obj(struct kmem_cache *cachep, struct page *page,
int nodeid)
static void *slab_get_obj(struct kmem_cache *cachep, struct page *page)
{
void *objp;
objp = index_to_obj(cachep, page, get_free_obj(page, page->active));
page->active++;
#if DEBUG
WARN_ON(page_to_nid(virt_to_page(objp)) != nodeid);
#endif
return objp;
}
static void slab_put_obj(struct kmem_cache *cachep, struct page *page,
void *objp, int nodeid)
static void slab_put_obj(struct kmem_cache *cachep,
struct page *page, void *objp)
{
unsigned int objnr = obj_to_index(cachep, page, objp);
#if DEBUG
unsigned int i;
/* Verify that the slab belongs to the intended node */
WARN_ON(page_to_nid(virt_to_page(objp)) != nodeid);
/* Verify double free bug */
for (i = page->active; i < cachep->num; i++) {
if (get_free_obj(page, i) == objnr) {
@ -2817,8 +2805,7 @@ retry:
STATS_INC_ACTIVE(cachep);
STATS_SET_HIGH(cachep);
ac_put_obj(cachep, ac, slab_get_obj(cachep, page,
node));
ac_put_obj(cachep, ac, slab_get_obj(cachep, page));
}
/* move slabp to correct slabp list: */
@ -3101,7 +3088,7 @@ retry:
BUG_ON(page->active == cachep->num);
obj = slab_get_obj(cachep, page, nodeid);
obj = slab_get_obj(cachep, page);
n->free_objects--;
/* move slabp to correct slabp list: */
list_del(&page->lru);
@ -3252,7 +3239,7 @@ static void free_block(struct kmem_cache *cachep, void **objpp,
page = virt_to_head_page(objp);
list_del(&page->lru);
check_spinlock_acquired_node(cachep, node);
slab_put_obj(cachep, page, objp, node);
slab_put_obj(cachep, page, objp);
STATS_DEC_ACTIVE(cachep);
n->free_objects++;
@ -3282,9 +3269,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
LIST_HEAD(list);
batchcount = ac->batchcount;
#if DEBUG
BUG_ON(!batchcount || batchcount > ac->avail);
#endif
check_irq_off();
n = get_node(cachep, node);
spin_lock(&n->list_lock);