cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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MP+unlocklockonceonce+fencermbonceonce.litmus (564B)

      1C MP+unlocklockonceonce+fencermbonceonce
      2
      3(*
      4 * Result: Never
      5 *
      6 * If two locked critical sections execute on the same CPU, stores in the
      7 * first must propagate to each CPU before stores in the second do, even if
      8 * the critical sections are protected by different locks.
      9 *)
     10
     11{}
     12
     13P0(spinlock_t *s, spinlock_t *t, int *x, int *y)
     14{
     15	spin_lock(s);
     16	WRITE_ONCE(*x, 1);
     17	spin_unlock(s);
     18	spin_lock(t);
     19	WRITE_ONCE(*y, 1);
     20	spin_unlock(t);
     21}
     22
     23P1(int *x, int *y)
     24{
     25	int r1;
     26	int r2;
     27
     28	r1 = READ_ONCE(*y);
     29	smp_rmb();
     30	r2 = READ_ONCE(*x);
     31}
     32
     33exists (1:r1=1 /\ 1:r2=0)