C based-on-ISA2+pooncelock+pooncelock+pombonce.litmus

(*
 * Result: Sometimes
 *
 * This test shows that two critical section protected by same lock
 * on same cpu DO NOT enforce ordering to external process!
 * This is likely to change soon.
 *)

{}

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

P1(int *x, int *y)
{
	int r1;
	int r2;

	r2 = READ_ONCE(*y);
	smp_mb();
	r1 = READ_ONCE(*x);
}

exists (1:r2=1 /\ 1:r1=0)