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Subject[PATCH tip/core/rcu 18/40] srcu: Allow early boot use of synchronize_srcu()
Date
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@linux.vnet.ibm.com>
---
kernel/rcu/srcu.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c
index 6beeba7b0b67..1026ce24922f 100644
--- a/kernel/rcu/srcu.c
+++ b/kernel/rcu/srcu.c
@@ -411,6 +411,8 @@ 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
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