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authorLai Jiangshan <laijs@cn.fujitsu.com>2014-06-03 15:33:27 +0800
committerTejun Heo <tj@kernel.org>2014-06-19 15:43:33 -0400
commitf05b558d7e0368e0511a098c4beb9654e41246c4 (patch)
tree46e5a4baeb2fb82ceacfe3e8db263be12b1819ec /kernel/workqueue.c
parentfb009e3a998e48fb33436bf9b563c82801a7329c (diff)
downloadlinux-rt-f05b558d7e0368e0511a098c4beb9654e41246c4.tar.gz
workqueue: clear POOL_DISASSOCIATED in rebind_workers()
The commit a9ab775bcadf ("workqueue: directly restore CPU affinity of workers from CPU_ONLINE") moved the pool->lock into rebind_workers() without also moving "pool->flags &= ~POOL_DISASSOCIATED". There is nothing wrong with "pool->flags &= ~POOL_DISASSOCIATED" not being moved together, but there isn't any benefit either. We move it into rebind_workers() and achieve these benefits: 1) Better readability. POOL_DISASSOCIATED is cleared in rebind_workers() as expected. 2) When POOL_DISASSOCIATED is cleared, we can ensure that all the running workers of the pool are on the local CPU (pool->cpu). tj: Cosmetic updates to the code and description. 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.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6203d2900877..129e4c3452ee 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4542,6 +4542,7 @@ static void rebind_workers(struct worker_pool *pool)
pool->attrs->cpumask) < 0);
spin_lock_irq(&pool->lock);
+ pool->flags &= ~POOL_DISASSOCIATED;
for_each_pool_worker(worker, pool) {
unsigned int worker_flags = worker->flags;
@@ -4643,15 +4644,10 @@ static int workqueue_cpu_up_callback(struct notifier_block *nfb,
for_each_pool(pool, pi) {
mutex_lock(&pool->attach_mutex);
- if (pool->cpu == cpu) {
- spin_lock_irq(&pool->lock);
- pool->flags &= ~POOL_DISASSOCIATED;
- spin_unlock_irq(&pool->lock);
-
+ if (pool->cpu == cpu)
rebind_workers(pool);
- } else if (pool->cpu < 0) {
+ else if (pool->cpu < 0)
restore_unbound_workers_cpumask(pool, cpu);
- }
mutex_unlock(&pool->attach_mutex);
}