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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>
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@ -230,9 +230,7 @@ EXPORT_SYMBOL_GPL(async_xor);
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static int page_is_zero(struct page *p, unsigned int offset, size_t len)
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{
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char *a = page_address(p) + offset;
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return ((*(u32 *) a) == 0 &&
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memcmp(a, a + 4, len - 4) == 0);
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return !memchr_inv(page_address(p) + offset, 0, len);
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}
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static inline struct dma_chan *
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