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Fix up non-NUMA SLAB configuration for zero-sized allocations

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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>
This commit is contained in:
Linus Torvalds 2007-07-19 13:17:15 -07:00
parent ce8c2293be
commit a5c96d8a1c
1 changed files with 2 additions and 2 deletions
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4
mm/slab.c
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@ -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);
}