From: Petr Mladek <pmladek@suse.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>, Tejun Heo <tj@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Josh Triplett <josh@joshtriplett.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jiri Kosina <jkosina@suse.cz>, Borislav Petkov <bp@suse.de>,
Michal Hocko <mhocko@suse.cz>,
linux-mm@kvack.org, Vlastimil Babka <vbabka@suse.cz>,
linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
Petr Mladek <pmladek@suse.com>
Subject: [PATCH v9 07/12] kthread: Add kthread_destroy_worker()
Date: Thu, 16 Jun 2016 13:17:26 +0200 [thread overview]
Message-ID: <1466075851-24013-8-git-send-email-pmladek@suse.com> (raw)
In-Reply-To: <1466075851-24013-1-git-send-email-pmladek@suse.com>
The current kthread worker users call flush() and stop() explicitly.
This function drains the worker, stops it, and frees the kthread_worker
struct in one call.
It is supposed to be used together with kthread_create_worker*() that
allocates struct kthread_worker.
Also note that drain() correctly handles self-queuing works in compare
with flush().
Signed-off-by: Petr Mladek <pmladek@suse.com>
---
include/linux/kthread.h | 2 ++
kernel/kthread.c | 21 +++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index c889b653f8cb..b2c4dcea8f51 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -137,4 +137,6 @@ void kthread_flush_work(struct kthread_work *work);
void kthread_flush_worker(struct kthread_worker *worker);
void kthread_drain_worker(struct kthread_worker *worker);
+void kthread_destroy_worker(struct kthread_worker *worker);
+
#endif /* _LINUX_KTHREAD_H */
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4454b1267718..567ec49b4872 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -853,3 +853,24 @@ void kthread_drain_worker(struct kthread_worker *worker)
spin_unlock_irq(&worker->lock);
}
EXPORT_SYMBOL(kthread_drain_worker);
+
+/**
+ * kthread_destroy_worker - destroy a kthread worker
+ * @worker: worker to be destroyed
+ *
+ * Drain and destroy @worker. It has the same conditions
+ * for use as kthread_drain_worker(), see above.
+ */
+void kthread_destroy_worker(struct kthread_worker *worker)
+{
+ struct task_struct *task;
+
+ task = worker->task;
+ if (WARN_ON(!task))
+ return;
+
+ kthread_drain_worker(worker);
+ kthread_stop(task);
+ kfree(worker);
+}
+EXPORT_SYMBOL(kthread_destroy_worker);
--
1.8.5.6
next prev parent reply other threads:[~2016-06-16 11:19 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 11:17 [PATCH v9 00/12] kthread: Kthread worker API improvements Petr Mladek
2016-06-16 11:17 ` [PATCH v9 01/12] kthread: Rename probe_kthread_data() to kthread_probe_data() Petr Mladek
2016-06-20 19:16 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 02/12] kthread: Kthread worker API cleanup Petr Mladek
2016-06-20 19:27 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 03/12] kthread/smpboot: Do not park in kthread_create_on_cpu() Petr Mladek
2016-06-16 11:17 ` [PATCH v9 04/12] kthread: Allow to call __kthread_create_on_node() with va_list args Petr Mladek
2016-06-20 19:51 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 05/12] kthread: Add kthread_create_worker*() Petr Mladek
2016-06-20 19:55 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 06/12] kthread: Add kthread_drain_worker() Petr Mladek
2016-06-20 19:56 ` Tejun Heo
2016-06-22 20:54 ` Peter Zijlstra
2016-06-23 21:32 ` Tejun Heo
2016-06-24 7:05 ` Peter Zijlstra
2016-06-24 9:08 ` Petr Mladek
2016-06-24 15:54 ` Tejun Heo
2016-06-27 14:33 ` Petr Mladek
2016-06-28 17:04 ` Tejun Heo
2016-06-29 8:17 ` Petr Mladek
2016-06-29 13:15 ` Tejun Heo
2016-06-16 11:17 ` Petr Mladek [this message]
2016-06-20 19:57 ` [PATCH v9 07/12] kthread: Add kthread_destroy_worker() Tejun Heo
2016-06-16 11:17 ` [PATCH v9 08/12] kthread: Detect when a kthread work is used by more workers Petr Mladek
2016-06-20 20:10 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 09/12] kthread: Initial support for delayed kthread work Petr Mladek
2016-06-20 20:20 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 10/12] kthread: Allow to cancel " Petr Mladek
2016-06-20 20:27 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 11/12] kthread: Allow to modify delayed " Petr Mladek
2016-06-20 20:29 ` Tejun Heo
2016-06-16 11:17 ` [PATCH v9 12/12] kthread: Better support freezable kthread workers Petr Mladek
2016-06-20 20:30 ` Tejun Heo
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