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Commit 284b50dd authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Linus Torvalds
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slub: make slab_index() return unsigned int 

slab_index() returns index of an object within a slab which is at most
u15 (or u16?).

Iterators additionally guarantee that "p >= addr".

Link: http://lkml.kernel.org/r/20180305200730.15812-22-adobriyan@gmail.com


Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Acked-by: default avatarChristoph 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7bbdb81e

mm/slub.c

+1 −1
Original line number Diff line number Diff line
@@ -311,7 +311,7 @@ static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) 
		__p += (__s)->size, __idx++)



/* Determine object index from a given position */

static inline int slab_index(void *p, struct kmem_cache *s, void *addr)

static inline unsigned int slab_index(void *p, struct kmem_cache *s, void *addr)

{

	return (p - addr) / s->size;

}