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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-04-20 01:40:54 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-06-13 15:33:19 -0700 |
| commit | 96050c68be33edef18800ad6748f61f81db81a20 (patch) | |
| tree | 94532580e0cca9f5d078de4548cf03b2efbbd04a /kernel/rcu | |
| parent | 714b6904e23e1c37f262a4cd02b34d0f1863e227 (diff) | |
| download | linux-96050c68be33edef18800ad6748f61f81db81a20.tar.gz | |
rcu: Upgrade sync_exp_work_done() to smp_mb()
The sync_exp_work_done() function uses smp_mb__before_atomic(), but
there is no obvious atomic in the ensuing code. The ordering is
absolutely required for grace periods to work correctly, so this
commit upgrades the smp_mb__before_atomic() to smp_mb().
Fixes: 6fba2b3767ea ("rcu: Remove deprecated RCU debugfs tracing code")
Reported-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree_exp.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h index 9c990df880d1..d969650a72c6 100644 --- a/kernel/rcu/tree_exp.h +++ b/kernel/rcu/tree_exp.h @@ -259,8 +259,7 @@ static bool sync_exp_work_done(unsigned long s) { if (rcu_exp_gp_seq_done(s)) { trace_rcu_exp_grace_period(rcu_state.name, s, TPS("done")); - /* Ensure test happens before caller kfree(). */ - smp_mb__before_atomic(); /* ^^^ */ + smp_mb(); /* Ensure test happens before caller kfree(). */ return true; } return false; |