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| author | Christoph Lameter <clameter@sgi.com> | 2007-05-06 14:49:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:12:53 -0700 |
| commit | 614410d5892af5f86d0ec14e28f9f6d5f4ac9e9b (patch) | |
| tree | 616c8437f45590a0ca6e2efdc2a5dfb61799d0ec | |
| parent | 47bfdc0d5a18a4b760ffb6a332932aaa5c0859e0 (diff) | |
| download | linux-3.10-614410d5892af5f86d0ec14e28f9f6d5f4ac9e9b.tar.gz linux-3.10-614410d5892af5f86d0ec14e28f9f6d5f4ac9e9b.tar.bz2 linux-3.10-614410d5892af5f86d0ec14e28f9f6d5f4ac9e9b.zip | |
SLUB: allocate smallest object size if the user asks for 0 bytes
Makes SLUB behave like SLAB in this area to avoid issues....
Throw a stack dump to alert people.
At some point the behavior should be switched back. NULL is no memory as
far as I can tell and if the use asked for 0 bytes then he need to get no
memory.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/slub_def.h | 8 | ||||
| -rw-r--r-- | mm/slub.c | 2 |
2 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 30b154ce728..f8e0c86c48a 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -80,8 +80,12 @@ extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; */ static inline int kmalloc_index(int size) { - if (size == 0) - return 0; + /* + * We should return 0 if size == 0 but we use the smallest object + * here for SLAB legacy reasons. + */ + WARN_ON_ONCE(size == 0); + if (size > 64 && size <= 96) return 1; if (size > 128 && size <= 192) diff --git a/mm/slub.c b/mm/slub.c index 4a8585befd8..9d52cce7c99 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1979,7 +1979,7 @@ static struct kmem_cache *get_slab(size_t size, gfp_t flags) { int index = kmalloc_index(size); - if (!size) + if (!index) return NULL; /* Allocation too large? */ |