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authorChristoph Lameter <clameter@sgi.com>2007-05-15 01:42:06 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-15 08:54:01 -0700
commitcfbf07f2a80b618c42a42c20d83647ea8fcceca0 (patch)
tree575c9834d1ed69459c79162042647008f2097123 /include
parent6a3ee3d5529c5e66aedf91401bfac65c61998639 (diff)
downloadop-kernel-dev-cfbf07f2a80b618c42a42c20d83647ea8fcceca0.zip
op-kernel-dev-cfbf07f2a80b618c42a42c20d83647ea8fcceca0.tar.gz
SLUB: CONFIG_LARGE_ALLOCS must consider MAX_ORDER limit
Take MAX_ORDER into consideration when determining KMALLOC_SHIFT_HIGH. Otherwise we may run into a situation where we attempt to create general slabs larger than MAX_ORDER. Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/slub_def.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index ea27065..fd6627e 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -60,7 +60,8 @@ struct kmem_cache {
#define KMALLOC_SHIFT_LOW 3
#ifdef CONFIG_LARGE_ALLOCS
-#define KMALLOC_SHIFT_HIGH 25
+#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT) =< 25 ? \
+ (MAX_ORDER + PAGE_SHIFT - 1) : 25)
#else
#if !defined(CONFIG_MMU) || NR_CPUS > 512 || MAX_NUMNODES > 256
#define KMALLOC_SHIFT_HIGH 20
@@ -87,6 +88,9 @@ static inline int kmalloc_index(int size)
*/
WARN_ON_ONCE(size == 0);
+ if (size >= (1 << KMALLOC_SHIFT_HIGH))
+ return -1;
+
if (size > 64 && size <= 96)
return 1;
if (size > 128 && size <= 192)
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