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async_tx: use memchr_inv

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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>
This commit is contained in:
Akinobu Mita 2012-10-28 00:49:33 +09:00 • committed by Vinod Koul
parent 1ba151cdf5
commit 2c88ae9093
1 changed files with 1 additions and 3 deletions
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4
crypto/async_tx/async_xor.c
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@ -230,9 +230,7 @@ EXPORT_SYMBOL_GPL(async_xor);
static int page_is_zero(struct page *p, unsigned int offset, size_t len) static int page_is_zero(struct page *p, unsigned int offset, size_t len)
{ {
char *a = page_address(p) + offset; return !memchr_inv(page_address(p) + offset, 0, len);
return ((*(u32 *) a) == 0 &&
memcmp(a, a + 4, len - 4) == 0);
} }
static inline struct dma_chan * static inline struct dma_chan *