Commit ade3aff2 authored May 16, 2007 by Andrew Morton Committed by Linus Torvalds May 17, 2007

slub: fix handling of oversized slabs



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>

parent 0b44f7a5

include/linux/slub_def.h

+6 −1

Original line number	Diff line number	Diff line
		@@ -145,7 +145,12 @@ static inline struct kmem_cache *kmalloc_slab(size_t size)
		if (index == 0)
		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
		* do something to stop the compile here.