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| C Atomic-RMW+mb__after_atomic-is-stronger-than-acquire
|
| (*
| * Result: Never
| *
| * Test that an atomic RMW followed by a smp_mb__after_atomic() is
| * stronger than a normal acquire: both the read and write parts of
| * the RMW are ordered before the subsequential memory accesses.
| *)
|
| {
| }
|
| P0(int *x, atomic_t *y)
| {
| int r0;
| int r1;
|
| r0 = READ_ONCE(*x);
| smp_rmb();
| r1 = atomic_read(y);
| }
|
| P1(int *x, atomic_t *y)
| {
| atomic_inc(y);
| smp_mb__after_atomic();
| WRITE_ONCE(*x, 1);
| }
|
| exists
| (0:r0=1 /\ 0:r1=0)
|
|
