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| author | Christoph Lameter <clameter@sgi.com> | 2007-07-17 04:03:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 10:23:01 -0700 |
| commit | 6cb8f91320d3e720351c21741da795fed580b21b (patch) | |
| tree | c9f73c8b82cd0f6c534939b8b9f36e8615b0ab2d /mm/slob.c | |
| parent | ef2ad80c7d255ed0449eda947c2d700635b7e0f5 (diff) | |
| download | lwn-6cb8f91320d3e720351c21741da795fed580b21b.tar.gz lwn-6cb8f91320d3e720351c21741da795fed580b21b.zip | |
Slab allocators: consistent ZERO_SIZE_PTR support and NULL result semantics
Define ZERO_OR_NULL_PTR macro to be able to remove the checks from the
allocators. Move ZERO_SIZE_PTR related stuff into slab.h.
Make ZERO_SIZE_PTR work for all slab allocators and get rid of the
WARN_ON_ONCE(size == 0) that is still remaining in SLAB.
Make slub return NULL like the other allocators if a too large memory segment
is requested via __kmalloc.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slob.c')
| -rw-r--r-- | mm/slob.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/mm/slob.c b/mm/slob.c index 154e7bdf3544..41d32c3c0be4 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -347,7 +347,7 @@ static void slob_free(void *block, int size) slobidx_t units; unsigned long flags; - if (!block) + if (ZERO_OR_NULL_PTR(block)) return; BUG_ON(!size); @@ -424,10 +424,13 @@ out: void *__kmalloc_node(size_t size, gfp_t gfp, int node) { + unsigned int *m; int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); if (size < PAGE_SIZE - align) { - unsigned int *m; + if (!size) + return ZERO_SIZE_PTR; + m = slob_alloc(size + align, gfp, align, node); if (m) *m = size; @@ -450,7 +453,7 @@ void kfree(const void *block) { struct slob_page *sp; - if (!block) + if (ZERO_OR_NULL_PTR(block)) return; sp = (struct slob_page *)virt_to_page(block); @@ -468,7 +471,7 @@ size_t ksize(const void *block) { struct slob_page *sp; - if (!block) + if (ZERO_OR_NULL_PTR(block)) return 0; sp = (struct slob_page *)virt_to_page(block); |