Commit 82805ab7 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
parent 7bc46560

include/linux/kthread.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

kernel/kthread.c

+15 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ struct kthread_create_info 


struct kthread {

	int should_stop;

	void *data;

	struct completion exited;

};
@@ -56,6 +57,19 @@ 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 */
@@ -66,6 +80,7 @@ static int kthread(void *_create) 
	int ret;



	self.should_stop = 0;

	self.data = data;

	init_completion(&self.exited);

	current->vfork_done = &self.exited;