Commit ade3aff2 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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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 <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 0b44f7a5
......@@ -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.
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