rcu: Allow rcu_irq_enter_check_tick() from NMI
Any which way around; here's a proper patch...
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b96d26d0..f5b61e1 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -936,8 +936,8 @@ void __rcu_irq_enter_check_tick(void)
{
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
- // Enabling the tick is unsafe in NMI handlers.
- if (WARN_ON_ONCE(in_nmi()))
+ // If we're here from NMI there's nothing to do.
+ if (in_nmi())
return;
RCU_LOCKDEP_WARN(rcu_dynticks_curr_cpu_in_eqs(),
