Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus

 1C Atomic-RMW+mb__after_atomic-is-stronger-than-acquire
 2
 3(*
 4 * Result: Never
 5 *
 6 * Test that an atomic RMW followed by a smp_mb__after_atomic() is
 7 * stronger than a normal acquire: both the read and write parts of
 8 * the RMW are ordered before the subsequential memory accesses.
 9 *)
10
11{
12}
13
14P0(int *x, atomic_t *y)
15{
16	int r0;
17	int r1;
18
19	r0 = READ_ONCE(*x);
20	smp_rmb();
21	r1 = atomic_read(y);
22}
23
24P1(int *x, atomic_t *y)
25{
26	atomic_inc(y);
27	smp_mb__after_atomic();
28	WRITE_ONCE(*x, 1);
29}
30
31exists
32(0:r0=1 /\ 0:r1=0)