sparc: Increase portability of strncpy_from_user() implementation.
Hide details of maximum user address calculation in a new asm/uaccess.h interface named user_addr_max(). Provide little-endian implementation in find_zero(), which should work but can probably be improved. Abstrace alignment check behind IS_UNALIGNED() macro. Kill double-semicolon, noticed by David Howells. Signed-off-by: David S. Miller <firstname.lastname@example.org>
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