51 lines
1.5 KiB
Diff
51 lines
1.5 KiB
Diff
From 3a16382d09e9b9e13013ea42c2db38bb44a83b5a Mon Sep 17 00:00:00 2001
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From: John Ogness <john.ogness@linutronix.de>
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Date: Mon, 11 Sep 2023 15:53:39 +0000
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Subject: [PATCH 145/196] rcu: Mark emergency section in rcu stalls
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Mark an emergency section within print_other_cpu_stall(), where
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RCU stall information is printed. In this section, the CPU will
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not perform console output for the printk() calls. Instead, a
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flushing of the console output will triggered when exiting the
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emergency section.
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/rcu/tree_stall.h | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
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index e09f4f624261..3114830489ef 100644
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--- a/kernel/rcu/tree_stall.h
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+++ b/kernel/rcu/tree_stall.h
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@@ -8,6 +8,7 @@
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*/
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#include <linux/kvm_para.h>
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+#include <linux/console.h>
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//////////////////////////////////////////////////////////////////////////////
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//
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@@ -603,6 +604,8 @@ static void print_other_cpu_stall(unsigned long gp_seq, unsigned long gps)
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if (rcu_stall_is_suppressed())
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return;
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+ nbcon_cpu_emergency_enter();
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+
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/*
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* OK, time to rat on our buddy...
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* See Documentation/RCU/stallwarn.rst for info on how to debug
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@@ -657,6 +660,8 @@ static void print_other_cpu_stall(unsigned long gp_seq, unsigned long gps)
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panic_on_rcu_stall();
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rcu_force_quiescent_state(); /* Kick them all. */
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+
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+ nbcon_cpu_emergency_exit();
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}
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static void print_cpu_stall(unsigned long gps)
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--
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2.43.2
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