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H A D | workqueue.c | 5b95e1af Tue May 12 07:32:29 CDT 2015 Lai Jiangshan <laijs@cn.fujitsu.com> workqueue: wq_pool_mutex protects the attrs-installation
Current wq_pool_mutex doesn't proctect the attrs-installation, it results that ->unbound_attrs, ->numa_pwq_tbl[] and ->dfl_pwq can only be accessed under wq->mutex and causes some inconveniences. Example, wq_update_unbound_numa() has to acquire wq->mutex before fetching the wq->unbound_attrs->no_numa and the old_pwq.
attrs-installation is a short operation, so this change will no cause any latency for other operations which also acquire the wq_pool_mutex.
The only unprotected attrs-installation code is in apply_workqueue_attrs(), so this patch touches code less than comments.
It is also a preparation patch for next several patches which read wq->unbound_attrs, wq->numa_pwq_tbl[] and wq->dfl_pwq with only wq_pool_mutex held.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org> 5b95e1af Tue May 12 07:32:29 CDT 2015 Lai Jiangshan <laijs@cn.fujitsu.com> workqueue: wq_pool_mutex protects the attrs-installation Current wq_pool_mutex doesn't proctect the attrs-installation, it results that ->unbound_attrs, ->numa_pwq_tbl[] and ->dfl_pwq can only be accessed under wq->mutex and causes some inconveniences. Example, wq_update_unbound_numa() has to acquire wq->mutex before fetching the wq->unbound_attrs->no_numa and the old_pwq. attrs-installation is a short operation, so this change will no cause any latency for other operations which also acquire the wq_pool_mutex. The only unprotected attrs-installation code is in apply_workqueue_attrs(), so this patch touches code less than comments. It is also a preparation patch for next several patches which read wq->unbound_attrs, wq->numa_pwq_tbl[] and wq->dfl_pwq with only wq_pool_mutex held. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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