ARM: 8091/2: add get_user() support for 8 byte types I mostly copied code from Russell King and H. Peter Anvin. However I ...use the ret macro (requested by Russell King) ...big endian systems (spotted by Russell King), ...word read with __get_user_xb() (Russell King's suggestion) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>