162306a36Sopenharmony_ciC WRC+pooncerelease+fencermbonceonce+Once
262306a36Sopenharmony_ci
362306a36Sopenharmony_ci(*
462306a36Sopenharmony_ci * Result: Never
562306a36Sopenharmony_ci *
662306a36Sopenharmony_ci * This litmus test is an extension of the message-passing pattern, where
762306a36Sopenharmony_ci * the first write is moved to a separate process.  Because it features
862306a36Sopenharmony_ci * a release and a read memory barrier, it should be forbidden.  More
962306a36Sopenharmony_ci * specifically, this litmus test is forbidden because smp_store_release()
1062306a36Sopenharmony_ci * is A-cumulative in LKMM.
1162306a36Sopenharmony_ci *)
1262306a36Sopenharmony_ci
1362306a36Sopenharmony_ci{}
1462306a36Sopenharmony_ci
1562306a36Sopenharmony_ciP0(int *x)
1662306a36Sopenharmony_ci{
1762306a36Sopenharmony_ci	WRITE_ONCE(*x, 1);
1862306a36Sopenharmony_ci}
1962306a36Sopenharmony_ci
2062306a36Sopenharmony_ciP1(int *x, int *y)
2162306a36Sopenharmony_ci{
2262306a36Sopenharmony_ci	int r0;
2362306a36Sopenharmony_ci
2462306a36Sopenharmony_ci	r0 = READ_ONCE(*x);
2562306a36Sopenharmony_ci	smp_store_release(y, 1);
2662306a36Sopenharmony_ci}
2762306a36Sopenharmony_ci
2862306a36Sopenharmony_ciP2(int *x, int *y)
2962306a36Sopenharmony_ci{
3062306a36Sopenharmony_ci	int r0;
3162306a36Sopenharmony_ci	int r1;
3262306a36Sopenharmony_ci
3362306a36Sopenharmony_ci	r0 = READ_ONCE(*y);
3462306a36Sopenharmony_ci	smp_rmb();
3562306a36Sopenharmony_ci	r1 = READ_ONCE(*x);
3662306a36Sopenharmony_ci}
3762306a36Sopenharmony_ci
3862306a36Sopenharmony_ciexists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
39