From 55f62d128bc40b0a26c9805e0ce95b995decd84b Mon Sep 17 00:00:00 2001 From: John Ogness Date: Mon, 11 Sep 2023 15:53:39 +0000 Subject: [PATCH 136/184] rcu: Mark emergency section in rcu stalls Mark an emergency section within print_other_cpu_stall(), where RCU stall information is printed. In this section, the CPU will not perform console output for the printk() calls. Instead, the console output will be flushed when exiting the emergency section. Signed-off-by: John Ogness Signed-off-by: Sebastian Andrzej Siewior --- kernel/rcu/tree_stall.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index 6f06dc12904a..ddd4005ce57a 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -8,6 +8,7 @@ */ #include +#include ////////////////////////////////////////////////////////////////////////////// // @@ -597,6 +598,8 @@ static void print_other_cpu_stall(unsigned long gp_seq, unsigned long gps) if (rcu_stall_is_suppressed()) return; + nbcon_cpu_emergency_enter(); + /* * OK, time to rat on our buddy... * See Documentation/RCU/stallwarn.rst for info on how to debug @@ -651,6 +654,8 @@ static void print_other_cpu_stall(unsigned long gp_seq, unsigned long gps) panic_on_rcu_stall(); rcu_force_quiescent_state(); /* Kick them all. */ + + nbcon_cpu_emergency_exit(); } static void print_cpu_stall(unsigned long gps) -- 2.34.1