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Use memchr_inv() to check the specified memory region is filled with zero. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: David Airlie <airlied@linux.ie> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Dave Airlie <airlied@redhat.com>