diff options
| -rw-r--r-- | kernel/rcu/tree.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 28c7031711a3..b7d943e98a9a 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -321,7 +321,15 @@ static bool rcu_dynticks_in_eqs(int snap) */ static bool rcu_dynticks_in_eqs_since(struct rcu_data *rdp, int snap) { - return snap != rcu_dynticks_snap(rdp->cpu); + /* + * The first failing snapshot is already ordered against the accesses + * performed by the remote CPU after it exits idle. + * + * The second snapshot therefore only needs to order against accesses + * performed by the remote CPU prior to entering idle and therefore can + * rely solely on acquire semantics. + */ + return snap != ct_dynticks_cpu_acquire(rdp->cpu); } /* |