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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>