On Sat, Aug 31, 2013 at 01:11:35AM -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rost...@goodmis.org>
>
> Some callbacks of the function tracer use rcu_read_lock(). This means that
> there's places that can not be traced because RCU is not tracking the CPU
> for various reasons (like NO_HZ_FULL and coming back from userspace).
>
> Thes functions need to be marked so that callbacks that use RCU do not
> trace them.
>
> Cc: Peter Zijlstra <pet...@infradead.org>
> Signed-off-by: Steven Rostedt <rost...@goodmis.org>
Acked-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
> ---
> kernel/sched/core.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index b7c32cb..9bd2aea 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1440,6 +1440,7 @@ void scheduler_ipi(void)
> }
> irq_exit();
> }
> +FTRACE_UNSAFE_RCU(scheduler_ipi);
>
> static void ttwu_queue_remote(struct task_struct *p, int cpu)
> {
> @@ -3222,6 +3223,7 @@ int idle_cpu(int cpu)
>
> return 1;
> }
> +FTRACE_UNSAFE_RCU(idle_cpu);
>
> /**
> * idle_task - return the idle task for a given cpu.
> --
> 1.7.10.4
>
>
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