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| author | Zqiang <qiang1.zhang@intel.com> | 2022-03-24 12:15:15 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-21 01:51:11 +0200 |
| commit | 88ca472f80604c070526eb58b977ea0a9c3c2e1f (patch) | |
| tree | c72cd8a73d898aa1b7b7773ba6ab62ecbd18e674 /kernel/rcu/tree_plugin.h | |
| parent | rcu: Fix preemption mode check on synchronize_rcu[_expedited]() (diff) | |
| download | linux-88ca472f80604c070526eb58b977ea0a9c3c2e1f.tar.xz linux-88ca472f80604c070526eb58b977ea0a9c3c2e1f.zip | |
rcu: Check for successful spawn of ->boost_kthread_task
For the spawning of the priority-boost kthreads can fail, improbable
though this might seem. This commit therefore refrains from attemoting
to initiate RCU priority boosting when The ->boost_kthread_task pointer
is NULL.
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 176639c6215f..5c23aceecd62 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1125,7 +1125,8 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags) __releases(rnp->lock) { raw_lockdep_assert_held_rcu_node(rnp); - if (!rcu_preempt_blocked_readers_cgp(rnp) && rnp->exp_tasks == NULL) { + if (!rnp->boost_kthread_task || + (!rcu_preempt_blocked_readers_cgp(rnp) && !rnp->exp_tasks)) { raw_spin_unlock_irqrestore_rcu_node(rnp, flags); return; } |