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authorJesper Dangaard Brouer <brouer@redhat.com>2015-11-20 15:57:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-22 11:58:44 -0800
commit865762a8119e74b5f0e236d2d8eaaf8be9292a06 (patch)
tree71d18041df3089d9baea367701f6eb503b98ebbc /include
parent033745189b1bae3fc931beeaf48604ee7c259309 (diff)
slab/slub: adjust kmem_cache_alloc_bulk API
Adjust kmem_cache_alloc_bulk API before we have any real users. Adjust API to return type 'int' instead of previously type 'bool'. This is done to allow future extension of the bulk alloc API. A future extension could be to allow SLUB to stop at a page boundary, when specified by a flag, and then return the number of objects. The advantage of this approach, would make it easier to make bulk alloc run without local IRQs disabled. With an approach of cmpxchg "stealing" the entire c->freelist or page->freelist. To avoid overshooting we would stop processing at a slab-page boundary. Else we always end up returning some objects at the cost of another cmpxchg. To keep compatible with future users of this API linking against an older kernel when using the new flag, we need to return the number of allocated objects with this API change. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/slab.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 96940772bb92..2037a861e367 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -316,7 +316,7 @@ void kmem_cache_free(struct kmem_cache *, void *);
* Note that interrupts must be enabled when calling these functions.
*/
void kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
-bool kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
+int kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment;

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