162306a36Sopenharmony_ciC S+fencewmbonceonce+poacquireonce 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Never 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * Can a smp_wmb(), instead of a release, and an acquire order a prior 762306a36Sopenharmony_ci * store against a subsequent store? 862306a36Sopenharmony_ci *) 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci{} 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ciP0(int *x, int *y) 1362306a36Sopenharmony_ci{ 1462306a36Sopenharmony_ci WRITE_ONCE(*x, 2); 1562306a36Sopenharmony_ci smp_wmb(); 1662306a36Sopenharmony_ci WRITE_ONCE(*y, 1); 1762306a36Sopenharmony_ci} 1862306a36Sopenharmony_ci 1962306a36Sopenharmony_ciP1(int *x, int *y) 2062306a36Sopenharmony_ci{ 2162306a36Sopenharmony_ci int r0; 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci r0 = smp_load_acquire(y); 2462306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 2562306a36Sopenharmony_ci} 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ciexists (x=2 /\ 1:r0=1) 28