Speed up bit reversal by using hardware bit reversal
Add extra code to handle less than 4byte remnants, if any
Signed-off-by: NJoshua Clayton <stillcompiling@gmail.com>
Signed-off-by: NAlan Tull <atull@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>