diff options
| -rw-r--r-- | kernel/rcu/rcutorture.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 06d08f4f3e52..3defd0febe15 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -921,6 +921,10 @@ static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long start static int dbg_done; if (end - start > test_boost_duration * HZ - HZ / 2) { + // Recheck after checking time to avoid false positives. + smp_mb(); // Time check before grace-period check. + if (cur_ops->poll_gp_state(gp_state)) + return false; // passed, though perhaps just barely VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); n_rcu_torture_boost_failure++; if (!xchg(&dbg_done, 1) && cur_ops->gp_kthread_dbg) { @@ -929,10 +933,10 @@ static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long start cur_ops->gp_kthread_dbg(); } - return true; /* failed */ + return true; // failed } - return false; /* passed */ + return false; // passed } static int rcu_torture_boost(void *arg) |