[PATCH v3 tip/core/rcu 15/40] srcu: Allow early boot use of synchronize_srcu()
From: Paul E. McKenney
Date: Wed Apr 19 2017 - 13:05:45 EST
This commit checks for pre-scheduler state, and if that early in the
boot process, synchronize_srcu() and friends are no-ops.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/srcu.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c
index e6da9fc1f0e9..7e7ecaa50dc5 100644
--- a/kernel/rcu/srcu.c
+++ b/kernel/rcu/srcu.c
@@ -417,6 +417,8 @@ static void __synchronize_srcu(struct srcu_struct *sp, int trycount)
lock_is_held(&rcu_sched_lock_map),
"Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section");
+ if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE)
+ return;
might_sleep();
init_completion(&rcu.completion);
--
2.5.2