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From: John Ogness <john.ogness@linutronix.de>
Date: Mon, 11 Sep 2023 15:53:39 +0000
Subject: [PATCH 35/50] rcu: Mark emergency section in rcu stalls
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.7/older/patches-6.7-rt6.tar.xz
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 will triggered when exiting the
emergency section.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/rcu/tree_stall.h | 5 +++++
1 file changed, 5 insertions(+)
--- 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(unsign
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(unsign
panic_on_rcu_stall();
rcu_force_quiescent_state(); /* Kick them all. */
+
+ nbcon_cpu_emergency_exit();
}
static void print_cpu_stall(unsigned long gps)
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