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Commit 94be52dc authored by Mandeep Singh Baines's avatar Mandeep Singh Baines Committed by Ingo Molnar
Browse files

softlockup: convert read_lock in hung_task to rcu_read_lock 



Since the tasklist is protected by rcu list operations, it is safe
to convert the read_lock()s to rcu_read_lock().

Suggested-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarMandeep Singh Baines <msb@google.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ce9dbe24

kernel/hung_task.c

+2 −2
Original line number Diff line number Diff line
@@ -155,7 +155,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout) 
	if (test_taint(TAINT_DIE) || did_panic)

		return;



	read_lock(&tasklist_lock);

	rcu_read_lock();

	do_each_thread(g, t) {

		if (!--max_count)

			goto unlock;
@@ -171,7 +171,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout) 
			check_hung_task(t, now, timeout);

	} while_each_thread(g, t);

 unlock:

	read_unlock(&tasklist_lock);

	rcu_read_unlock();

}



static void update_poll_jiffies(void)