diff options
| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2013-03-19 20:28:10 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-03-20 19:00:57 +0100 |
| commit | 881094532e2a27406a5f06f839087bd152a8a494 (patch) | |
| tree | 993b36c51374695056781f6bb01f258aea3e71cc /kernel/workqueue.c | |
| parent | workqueue: kick a worker in pwq_adjust_max_active() (diff) | |
| download | linux-881094532e2a27406a5f06f839087bd152a8a494.tar.xz linux-881094532e2a27406a5f06f839087bd152a8a494.zip | |
workqueue: use rcu_read_lock_sched() instead for accessing pwq in RCU
rcu_read_lock_sched() is better than preempt_disable() if the code is
protected by RCU_SCHED.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 79d1d347e690..b6c5a524d7c4 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -3962,7 +3962,7 @@ bool workqueue_congested(int cpu, struct workqueue_struct *wq) struct pool_workqueue *pwq; bool ret; - preempt_disable(); + rcu_read_lock_sched(); if (!(wq->flags & WQ_UNBOUND)) pwq = per_cpu_ptr(wq->cpu_pwqs, cpu); @@ -3970,7 +3970,7 @@ bool workqueue_congested(int cpu, struct workqueue_struct *wq) pwq = first_pwq(wq); ret = !list_empty(&pwq->delayed_works); - preempt_enable(); + rcu_read_unlock_sched(); return ret; } @@ -4354,16 +4354,16 @@ bool freeze_workqueues_busy(void) * nr_active is monotonically decreasing. It's safe * to peek without lock. */ - preempt_disable(); + rcu_read_lock_sched(); for_each_pwq(pwq, wq) { WARN_ON_ONCE(pwq->nr_active < 0); if (pwq->nr_active) { busy = true; - preempt_enable(); + rcu_read_unlock_sched(); goto out_unlock; } } - preempt_enable(); + rcu_read_unlock_sched(); } out_unlock: mutex_unlock(&wq_mutex); |