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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:17:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:17:15 -0700
commita5c96d8a1c67f31ef48935a78da2d2076513842b (patch)
treed164c6b33a1de9ea157b99bb353f84e41774164e
parentce8c2293be47999584908069e78bf6d94beadc53 (diff)
downloadlinux-linaro-a5c96d8a1c67f31ef48935a78da2d2076513842b.tar.gz
Fix up non-NUMA SLAB configuration for zero-sized allocations
I suspect Christoph tested his code only in the NUMA configuration, for the combination of SLAB+non-NUMA the zero-sized kmalloc's would not work. Of course, this would only trigger in configurations where those zero- sized allocations happen (not very common), so that may explain why it wasn't more widely noticed. Seen by by Andi Kleen under qemu, and there seems to be a report by Michael Tsirkin on it too. Cc: Andi Kleen <ak@suse.de> Cc: Roland Dreier <rdreier@cisco.com> Cc: Michael S. Tsirkin <mst@dev.mellanox.co.il> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 88bc6336ce3..c3feeaab387 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3690,8 +3690,8 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
* functions.
*/
cachep = __find_general_cachep(size, flags);
- if (unlikely(cachep == NULL))
- return NULL;
+ if (unlikely(ZERO_OR_NULL_PTR(cachep)))
+ return cachep;
return __cache_alloc(cachep, flags, caller);
}