linux-kernel - [PATCH 05/19] kthread: implement kthread

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Message-Id: <1254384558-1018-6-git-send-email-tj@kernel.org>
Date:	Thu,  1 Oct 2009 17:09:04 +0900
From:	Tejun Heo <tj@...nel.org>
To:	jeff@...zik.org, mingo@...e.hu, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 05/19] kthread: implement kthread_data()

Implement kthread_data() which takes @task pointing to a kthread and
returns @data specified when creating the kthread.  The caller is
responsible for ensuring the validity of @task when calling this
function.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 include/linux/kthread.h |    1 +
 kernel/kthread.c        |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index aabc8a1..14f63e8 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -30,6 +30,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
 void kthread_bind(struct task_struct *k, unsigned int cpu);
 int kthread_stop(struct task_struct *k);
 int kthread_should_stop(void);
+void *kthread_data(struct task_struct *k);
 
 int kthreadd(void *unused);
 extern struct task_struct *kthreadd_task;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5fe7099..bd4cb7f 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -35,6 +35,7 @@ struct kthread_create_info
 
 struct kthread {
 	int should_stop;
+	void *data;
 	struct completion exited;
 };
 
@@ -54,6 +55,19 @@ int kthread_should_stop(void)
 }
 EXPORT_SYMBOL(kthread_should_stop);
 
+/**
+ * kthread_data - return data value specified on kthread creation
+ * @task: kthread task in question
+ *
+ * Return the data value specified when kthread @task was created.
+ * The caller is responsible for ensuring the validity of @task when
+ * calling this function.
+ */
+void *kthread_data(struct task_struct *task)
+{
+	return to_kthread(task)->data;
+}
+
 static int kthread(void *_create)
 {
 	/* Copy data: it's on kthread's stack */
@@ -64,6 +78,7 @@ static int kthread(void *_create)
 	int ret;
 
 	self.should_stop = 0;
+	self.data = data;
 	init_completion(&self.exited);
 	current->vfork_done = &self.exited;
 
-- 
1.6.4.2

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