diff options
author | Pekka Enberg <penberg@cs.helsinki.fi> | 2007-05-07 01:48:40 +0400 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 23:12:50 +0400 |
commit | fd76bab2fa6d8f3ef6b326a4c6ae442fa21d30a4 (patch) | |
tree | 66f310ab9d7cdadfb79486700f1e01df7923ec14 /mm/slob.c | |
parent | e3ebadd95cb621e2c7436f3d3646447ac9d5c16d (diff) | |
download | linux-fd76bab2fa6d8f3ef6b326a4c6ae442fa21d30a4.tar.xz |
slab: introduce krealloc
This introduce krealloc() that reallocates memory while keeping the contents
unchanged. The allocator avoids reallocation if the new size fits the
currently used cache. I also added a simple non-optimized version for
mm/slob.c for compatibility.
[akpm@linux-foundation.org: fix warnings]
Acked-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Acked-by: Matt Mackall <mpm@selenic.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-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 | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/mm/slob.c b/mm/slob.c index 5adc29cb58dd..03cce3d3d986 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -190,6 +190,39 @@ void *__kmalloc(size_t size, gfp_t gfp) } EXPORT_SYMBOL(__kmalloc); +/** + * krealloc - reallocate memory. The contents will remain unchanged. + * + * @p: object to reallocate memory for. + * @new_size: how many bytes of memory are required. + * @flags: the type of memory to allocate. + * + * The contents of the object pointed to are preserved up to the + * lesser of the new and old sizes. If @p is %NULL, krealloc() + * behaves exactly like kmalloc(). If @size is 0 and @p is not a + * %NULL pointer, the object pointed to is freed. + */ +void *krealloc(const void *p, size_t new_size, gfp_t flags) +{ + void *ret; + + if (unlikely(!p)) + return kmalloc_track_caller(new_size, flags); + + if (unlikely(!new_size)) { + kfree(p); + return NULL; + } + + ret = kmalloc_track_caller(new_size, flags); + if (ret) { + memcpy(ret, p, min(new_size, ksize(p))); + kfree(p); + } + return ret; +} +EXPORT_SYMBOL(krealloc); + void kfree(const void *block) { bigblock_t *bb, **last = &bigblocks; @@ -219,7 +252,7 @@ void kfree(const void *block) EXPORT_SYMBOL(kfree); -unsigned int ksize(const void *block) +size_t ksize(const void *block) { bigblock_t *bb; unsigned long flags; |