Use ll/sc loops instead of C loops around cmpxchg.
Update the atomic64_add_unless block comment to match the code.
Reviewed-and-Tested-by: NMatt Turner <mattst88@gmail.com>
Signed-off-by: NMatt Turner <mattst88@gmail.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>