On Tue, 2012-07-31 at 16:57 -0700, Paul E. McKenney wrote:
> > What was the next lines? I bet you it was "PASSED". Which means it did
> > not fail. This is the second bug you found that has to do with RCU being
> > called in 'idle'. The one that Paul posted a patch for.
>
> Though it needs another patch to actually use it in the right place...
Right. Something like this:
-- Steve
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5638104..d915638 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -631,7 +631,12 @@ __update_max_tr(struct trace_array *tr, struct task_struct
*tsk, int cpu)
memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN);
max_data->pid = tsk->pid;
- max_data->uid = task_uid(tsk);
+ /*
+ * task_uid() calls rcu_read_lock, but this can be called
+ * outside of RCU state monitoring (irq going back to idle).
+ */
+ RCU_NONIDLE(max_data->uid = task_uid(tsk));
+
max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
max_data->policy = tsk->policy;
max_data->rt_priority = tsk->rt_priority;
--
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