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srcu: Allow early boot use of synchronize_srcu()

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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>
This commit is contained in:
Paul E. McKenney 2017-02-10 14:50:46 -08:00
parent 900b1028ec
commit b5eaeaa509
1 changed files with 2 additions and 0 deletions
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2
kernel/rcu/srcu.c
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@ -417,6 +417,8 @@ static void __synchronize_srcu(struct srcu_struct *sp, int trycount)
lock_is_held(&rcu_sched_lock_map), lock_is_held(&rcu_sched_lock_map),
"Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section"); "Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section");
if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE)
return;
might_sleep(); might_sleep();
init_completion(&rcu.completion); init_completion(&rcu.completion);