linux-kernel - [PATCH] panic: call hardlockup_detector_perf

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Message-ID: <20250730030638.65355-1-wangjinchao600@gmail.com>
Date: Wed, 30 Jul 2025 11:06:33 +0800
From: Wang Jinchao <wangjinchao600@...il.com>
To: Petr Mladek <pmladek@...e.com>,
	John Ogness <john.ogness@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Joel Granados <joel.granados@...nel.org>,
	Dave Jiang <dave.jiang@...el.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Sravan Kumar Gundu <sravankumarlpu@...il.com>,
	Ryo Takakura <takakura@...inux.co.jp>
Cc: linux-kernel@...r.kernel.org,
	Wang Jinchao <wangjinchao600@...il.com>,
	Wei Liu <wei.liu@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH] panic: call hardlockup_detector_perf_stop in panic

When a panic happens, it blocks the cpu, which may
trigger the hardlockup detector if some dump is slow.
So call hardlockup_detector_perf_stop() to disable
hardlockup dector.

Signed-off-by: Wang Jinchao <wangjinchao600@...il.com>
---
 kernel/panic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/panic.c b/kernel/panic.c
index b0b9a8bf4560..52a1ac4ad447 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -339,6 +339,7 @@ void panic(const char *fmt, ...)
 	 */
 	local_irq_disable();
 	preempt_disable_notrace();
+	hardlockup_detector_perf_stop();
 
 	/*
 	 * It's possible to come here directly from a panic-assertion and
-- 
2.43.0