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>

parent 59a3759d

mm/util.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{