srcu: Allow early boot use of synchronize_srcu()

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>

parent 900b1028

kernel/rcu/srcu.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);