162306a36Sopenharmony_ciC R+poonceonces 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Sometimes 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * This is the unordered (thus lacking smp_mb()) version of one of the 762306a36Sopenharmony_ci * classic counterintuitive litmus tests that illustrates the effects of 862306a36Sopenharmony_ci * store propagation delays. 962306a36Sopenharmony_ci *) 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci{} 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ciP0(int *x, int *y) 1462306a36Sopenharmony_ci{ 1562306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 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 WRITE_ONCE(*y, 2); 2462306a36Sopenharmony_ci r0 = READ_ONCE(*x); 2562306a36Sopenharmony_ci} 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ciexists (y=2 /\ 1:r0=0) 28