alternative_atomic64
alternative_atomic64(xchg,
alternative_atomic64(set,
alternative_atomic64(read, "=&A" (r), "c" (v), "memory");
alternative_atomic64(add_return,
alternative_atomic64(sub_return,
alternative_atomic64(inc_return,
alternative_atomic64(dec_return,
alternative_atomic64(add_unless,
alternative_atomic64(inc_not_zero,
alternative_atomic64(dec_if_positive,