Commit 2c88ae90 authored Oct 28, 2012 by Akinobu Mita Committed by Vinod Koul Jan 07, 2013

async_tx: use memchr_inv



Use memchr_inv() to check the specified page is filled with zero.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <djbw@fb.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

parent 1ba151cd

crypto/async_tx/async_xor.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -230,9 +230,7 @@ EXPORT_SYMBOL_GPL(async_xor);

		static int page_is_zero(struct page *p, unsigned int offset, size_t len)
		{
		char *a = page_address(p) + offset;
		return (((u32 ) a) == 0 &&
		memcmp(a, a + 4, len - 4) == 0);
		return !memchr_inv(page_address(p) + offset, 0, len);
		}

		static inline struct dma_chan *