linux-kernel - [PATCH 2/2] reboot: flush printk buffers before final shutdown

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Date:   Mon, 30 Oct 2023 10:24:32 +0100
From:   Martin Hundebøll <martin@...nix.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org,
        Martin Hundebøll <martin@...nix.com>
Subject: [PATCH 2/2] reboot: flush printk buffers before final shutdown

Make sure printed messages are in fact printed before putting the system
down.

Signed-off-by: Martin Hundebøll <martin@...nix.com>
---
 kernel/reboot.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/reboot.c b/kernel/reboot.c
index 3bba88c7ffc6..bab8350d5dae 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -273,6 +273,7 @@ void kernel_restart(char *cmd)
 	else
 		pr_emerg("Restarting system with command '%s'\n", cmd);
 	kmsg_dump(KMSG_DUMP_SHUTDOWN);
+	pr_flush(1000, false);
 	machine_restart(cmd);
 }
 EXPORT_SYMBOL_GPL(kernel_restart);
-- 
2.42.0