From a234bdc9aecc299ba41ffe8023b3ea110df9f51b Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Sun, 31 May 2009 13:50:38 +0300 Subject: 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 Signed-off-by: Pekka Enberg --- mm/util.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/util.c b/mm/util.c index 55bef160b9f1..e79572b3684c 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) { -- cgit v1.2.3