Re: [PATCH v2] tracing/perf: Move rcu_irq_enter/exit_irqson() to perf trace point hook

[Paul E. McKenney]

On Tue, Feb 11, 2020 at 06:32:13PM +0100, Peter Zijlstra wrote:
> On Tue, Feb 11, 2020 at 06:29:52PM +0100, Peter Zijlstra wrote:
> > +#define trace_rcu_enter()					\
> > +({								\
> > +	unsigned long state = 0;				\
> > +	if (!rcu_is_watching())	{				\
> 
> Also, afaict rcu_is_watching() itself needs more love, the functio has
> notrace, but calls other stuff that does not have notrace or inline.

Good catch!  Like this?

							Thanx, Paul

------------------------------------------------------------------------

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 1f5fdf7..51616e72 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -295,7 +295,7 @@ static void rcu_dynticks_eqs_online(void)
  *
  * No ordering, as we are sampling CPU-local information.
  */
-static bool rcu_dynticks_curr_cpu_in_eqs(void)
+static bool notrace rcu_dynticks_curr_cpu_in_eqs(void)
 {
 	struct rcu_data *rdp = this_cpu_ptr(&rcu_data);