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- C MP+polockmbonce+poacquiresilsil
- (*
- * Result: Never
- *
- * Do spinlocks combined with smp_mb__after_spinlock() provide order
- * to outside observers using spin_is_locked() to sense the lock-held
- * state, ordered by acquire? Note that when the first spin_is_locked()
- * returns false and the second true, we know that the smp_load_acquire()
- * executed before the lock was acquired (loosely speaking).
- *)
- {
- }
- P0(spinlock_t *lo, int *x)
- {
- spin_lock(lo);
- smp_mb__after_spinlock();
- WRITE_ONCE(*x, 1);
- spin_unlock(lo);
- }
- P1(spinlock_t *lo, int *x)
- {
- int r1;
- int r2;
- int r3;
- r1 = smp_load_acquire(x);
- r2 = spin_is_locked(lo);
- r3 = spin_is_locked(lo);
- }
- exists (1:r1=1 /\ 1:r2=0 /\ 1:r3=1)
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