Re: [PATCH 2/2] reboot: flush printk buffers before final shutdown

[John Ogness]

On 2023-10-30, Martin Hundebøll <martin@xxxxxxxxxx> wrote:
> Make sure printed messages are in fact printed before putting the system
> down.
>
> Signed-off-by: Martin Hundebøll <martin@xxxxxxxxxx>
> ---
>  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);

printk() tries to print directly from the calling context. Are you
experiencing problems where you do not see the restarting message?

John Ogness