linux-kernel - [PATCH v8 07/12] kthread: Add kthread_destroy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1465480326-31606-8-git-send-email-pmladek@suse.com>
Date:	Thu,  9 Jun 2016 15:52:01 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...e.de>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [PATCH v8 07/12] kthread: Add kthread_destroy_worker()

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@...e.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 6fc0940b9657..c0a527581d95 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 fa3c327be889..d9f59fdcf466 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