Test MP+locked+rmb

C MP+locked+rmb
{}


P0(int* y,int* x,spinlock_t* lo) {
  spin_lock(lo);
  WRITE_ONCE(*x,1);
  spin_unlock(lo);
  spin_lock(lo);
  WRITE_ONCE(*y,1);
  spin_unlock(lo);
}

P1(int* y,int* x) {
  int r0 = READ_ONCE(*y);
  smp_rmb();
  int r1 = READ_ONCE(*x);
}

Observed
    1:r1=0; 1:r0=1;