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authorPekka Enberg <penberg@cs.helsinki.fi>2009-05-31 13:50:38 +0300
committerPekka Enberg <penberg@cs.helsinki.fi>2009-06-01 09:22:46 +0300
commita234bdc9aecc299ba41ffe8023b3ea110df9f51b (patch)
tree08b71ab1fc445f6ac64b2cb96b615e0e10833b46 /mm/util.c
parent59a3759d0fe8d969888c741bb33f4946e4d3750d (diff)
downloadlinux-a234bdc9aecc299ba41ffe8023b3ea110df9f51b.tar.gz
slab: document kzfree() zeroing behavior
As suggested by Alan Cox, document the fact that kzfree() can zero out a great deal more memory than the what the user requested from kmalloc(). Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c
index 55bef160b9f..e79572b3684 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -166,6 +166,10 @@ EXPORT_SYMBOL(krealloc);
*
* The memory of the object @p points to is zeroed before freed.
* If @p is %NULL, kzfree() does nothing.
+ *
+ * Note: this function zeroes the whole allocated buffer which can be a good
+ * deal bigger than the requested buffer size passed to kmalloc(). So be
+ * careful when using this function in performance sensitive code.
*/
void kzfree(const void *p)
{