18c2ecf20Sopenharmony_ciC R+poonceonces 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ci(* 48c2ecf20Sopenharmony_ci * Result: Sometimes 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * This is the unordered (thus lacking smp_mb()) version of one of the 78c2ecf20Sopenharmony_ci * classic counterintuitive litmus tests that illustrates the effects of 88c2ecf20Sopenharmony_ci * store propagation delays. 98c2ecf20Sopenharmony_ci *) 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci{} 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ciP0(int *x, int *y) 148c2ecf20Sopenharmony_ci{ 158c2ecf20Sopenharmony_ci WRITE_ONCE(*x, 1); 168c2ecf20Sopenharmony_ci WRITE_ONCE(*y, 1); 178c2ecf20Sopenharmony_ci} 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_ciP1(int *x, int *y) 208c2ecf20Sopenharmony_ci{ 218c2ecf20Sopenharmony_ci int r0; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci WRITE_ONCE(*y, 2); 248c2ecf20Sopenharmony_ci r0 = READ_ONCE(*x); 258c2ecf20Sopenharmony_ci} 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciexists (y=2 /\ 1:r0=0) 28