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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-02-10 14:50:46 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-18 11:38:18 -0700 |
| commit | b5eaeaa509d30812049f9e1c05446d564e91616b (patch) | |
| tree | b12c83bf2e5ee0e2b4b792d6fb04411c2887cc10 | |
| parent | srcu: Allow SRCU to access rcu_scheduler_active (diff) | |
| download | linux-dev-b5eaeaa509d30812049f9e1c05446d564e91616b.tar.xz linux-dev-b5eaeaa509d30812049f9e1c05446d564e91616b.zip | |
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>
| -rw-r--r-- | kernel/rcu/srcu.c | 2 |
1 files changed, 2 insertions, 0 deletions
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); |