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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Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus (508B)

      1C Atomic-RMW+mb__after_atomic-is-stronger-than-acquire
      2
      3(*
      4 * Result: Never
      5 *
      6 * Test that an atomic RMW followed by a smp_mb__after_atomic() is
      7 * stronger than a normal acquire: both the read and write parts of
      8 * the RMW are ordered before the subsequential memory accesses.
      9 *)
     10
     11{
     12}
     13
     14P0(int *x, atomic_t *y)
     15{
     16	int r0;
     17	int r1;
     18
     19	r0 = READ_ONCE(*x);
     20	smp_rmb();
     21	r1 = atomic_read(y);
     22}
     23
     24P1(int *x, atomic_t *y)
     25{
     26	atomic_inc(y);
     27	smp_mb__after_atomic();
     28	WRITE_ONCE(*x, 1);
     29}
     30
     31exists
     32(0:r0=1 /\ 0:r1=0)