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softlockup: convert read_lock in hung_task to rcu_read_lock

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

Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mandeep Singh Baines <msb@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mandeep Singh Baines 2009-02-05 09:56:08 -08:00 committed by Ingo Molnar
parent ce9dbe244b
commit 94be52dc07
1 changed files with 2 additions and 2 deletions
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4
kernel/hung_task.c
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@ -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)