11c27b644SPaul E. McKenneyC S+poonceonces 21c27b644SPaul E. McKenney 38f32543bSPaul E. McKenney(* 48f32543bSPaul E. McKenney * Result: Sometimes 58f32543bSPaul E. McKenney * 68f32543bSPaul E. McKenney * Starting with a two-process release-acquire chain ordering P0()'s 78f32543bSPaul E. McKenney * first store against P1()'s final load, if the smp_store_release() 88f32543bSPaul E. McKenney * is replaced by WRITE_ONCE() and the smp_load_acquire() replaced by 98f32543bSPaul E. McKenney * READ_ONCE(), is ordering preserved? 108f32543bSPaul E. McKenney *) 118f32543bSPaul E. McKenney 12*5c587f9bSAkira Yokosawa{} 131c27b644SPaul E. McKenney 141c27b644SPaul E. McKenneyP0(int *x, int *y) 151c27b644SPaul E. McKenney{ 161c27b644SPaul E. McKenney WRITE_ONCE(*x, 2); 171c27b644SPaul E. McKenney WRITE_ONCE(*y, 1); 181c27b644SPaul E. McKenney} 191c27b644SPaul E. McKenney 201c27b644SPaul E. McKenneyP1(int *x, int *y) 211c27b644SPaul E. McKenney{ 221c27b644SPaul E. McKenney int r0; 231c27b644SPaul E. McKenney 241c27b644SPaul E. McKenney r0 = READ_ONCE(*y); 251c27b644SPaul E. McKenney WRITE_ONCE(*x, 1); 261c27b644SPaul E. McKenney} 271c27b644SPaul E. McKenney 281c27b644SPaul E. McKenneyexists (x=2 /\ 1:r0=1) 29