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| author | Christoph Lameter <cl@linux.com> | 2011-05-20 18:42:48 +0400 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2011-05-21 13:53:53 +0400 |
| commit | 3e0c2ab67e48f77c2da0a5c826aac397792a214e (patch) | |
| tree | 937d195659cb72bbd038907e36b23e5c0e7c262d /include/linux/slub_def.h | |
| parent | 442b06bcea23a01934d3da7ec5898fa154a6cafb (diff) | |
| download | linux-3e0c2ab67e48f77c2da0a5c826aac397792a214e.tar.xz | |
slub: Deal with hyperthetical case of PAGE_SIZE > 2M
kmalloc_index() currently returns -1 if the PAGE_SIZE is larger than 2M
which seems to cause some concern since the callers do not check for -1.
Insert a BUG() and add a comment to the -1 explaining that the code
cannot be reached.
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'include/linux/slub_def.h')
| -rw-r--r-- | include/linux/slub_def.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index ca0c076b2374..c8668d161dd8 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -177,7 +177,8 @@ static __always_inline int kmalloc_index(size_t size) if (size <= 4 * 1024) return 12; /* * The following is only needed to support architectures with a larger page - * size than 4k. + * size than 4k. We need to support 2 * PAGE_SIZE here. So for a 64k page + * size we would have to go up to 128k. */ if (size <= 8 * 1024) return 13; if (size <= 16 * 1024) return 14; @@ -188,7 +189,8 @@ static __always_inline int kmalloc_index(size_t size) if (size <= 512 * 1024) return 19; if (size <= 1024 * 1024) return 20; if (size <= 2 * 1024 * 1024) return 21; - return -1; + BUG(); + return -1; /* Will never be reached */ /* * What we really wanted to do and cannot do because of compiler issues is: |