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slab: avoid running debug SLAB code with IRQs disabled for alloc_bulk 

Move the call to cache_alloc_debugcheck_after() outside the IRQ disabled
section in kmem_cache_alloc_bulk().

When CONFIG_DEBUG_SLAB is disabled the compiler should remove this code.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.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: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Jesper Dangaard Brouer 2016-03-15 14:53:53 -07:00 committed by Linus Torvalds
parent 2a777eac17
commit 7b0501dd6b
1 changed files with 13 additions and 3 deletions
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16
mm/slab.c
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@ -3391,6 +3391,16 @@ void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
}
EXPORT_SYMBOL(kmem_cache_free_bulk);
static __always_inline void
cache_alloc_debugcheck_after_bulk(struct kmem_cache *s, gfp_t flags,
size_t size, void **p, unsigned long caller)
{
size_t i;
for (i = 0; i < size; i++)
p[i] = cache_alloc_debugcheck_after(s, flags, p[i], caller);
}
int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
void **p)
{
@ -3406,15 +3416,14 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
for (i = 0; i < size; i++) {
void *objp = __do_cache_alloc(s, flags);
/* this call could be done outside IRQ disabled section */
objp = cache_alloc_debugcheck_after(s, flags, objp, _RET_IP_);
if (unlikely(!objp))
goto error;
p[i] = objp;
}
local_irq_enable();
cache_alloc_debugcheck_after_bulk(s, flags, size, p, _RET_IP_);
/* Clear memory outside IRQ disabled section */
if (unlikely(flags & __GFP_ZERO))
for (i = 0; i < size; i++)
@ -3425,6 +3434,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
return size;
error:
local_irq_enable();
cache_alloc_debugcheck_after_bulk(s, flags, i, p, _RET_IP_);
slab_post_alloc_hook(s, flags, i, p);
__kmem_cache_free_bulk(s, i, p);
return 0;