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- Use memchr_inv to check if the data contains all 0xFF bytes. It is faster than looping for each byte. - Use memcmp to compare memory areas Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>