G eiid0 WRITE_ONCE(*y,1) eiid7 eiid1 WRITE_ONCE(*x,1) eiid1->eiid0 po eiid2 r1 = READ_ONCE(*x) eiid1->eiid2 rf eiid3 r2 = READ_ONCE(*y) eiid2->eiid3 po eiid11 eiid3->eiid0 fr .