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slub: fix handling of oversized slabs

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I'm getting zillions of undefined references to __kmalloc_size_too_large on
alpha.  For some reason alpha is building out-of-line copies of kmalloc_slab()
into lots of compilation units.

It turns out that gcc just isn't smart enough to work out that
__builtin_contant_p(size)==true implies that __builtin_contant_p(index)==true.

So let's give it a bit of help.

Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2007-05-16 22:10:54 -07:00 • committed by Linus Torvalds
parent 0b44f7a5b5
commit ade3aff25f
1 changed files with 6 additions and 1 deletions
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7
include/linux/slub_def.h
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@ -145,7 +145,12 @@ static inline struct kmem_cache *kmalloc_slab(size_t size)
if (index == 0) if (index == 0)
return NULL; return NULL;
if (index < 0) { /*
* This function only gets expanded if __builtin_constant_p(size), so
* testing it here shouldn't be needed. But some versions of gcc need
* help.
*/
if (__builtin_constant_p(size) && index < 0) {
/* /*
* Generate a link failure. Would be great if we could * Generate a link failure. Would be great if we could
* do something to stop the compile here. * do something to stop the compile here.