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-rw-r--r--mm/util.c4
1 files changed, 4 insertions, 0 deletions
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)
{