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, a flushing of the console output is triggered when exiting the emergency section. Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx> --- 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 ac8e86babe44..efb2be8939a2 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -9,6 +9,7 @@ #include <linux/kvm_para.h> #include <linux/rcu_notifier.h> +#include <linux/console.h> ////////////////////////////////////////////////////////////////////////////// // @@ -604,6 +605,8 @@ 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 @@ -658,6 +661,8 @@ 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) -- 2.39.2
