linux-kernel - Re: [PATCH v2 2/2] x86/panic: Add x86_panic_handler as default post-panic behavior

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Message-ID: <84bjseozci.fsf@jogness.linutronix.de>
Date: Wed, 30 Apr 2025 10:04:05 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Carlos Bilbao <carlos.bilbao.osdev@...il.com>, carlos.bilbao@...nel.org,
 tglx@...utronix.de, seanjc@...gle.com, jan.glauber@...il.com
Cc: bilbao@...edu, pmladek@...e.com, akpm@...ux-foundation.org,
 jani.nikula@...el.com, linux-kernel@...r.kernel.org,
 gregkh@...uxfoundation.org, takakura@...inux.co.jp
Subject: Re: [PATCH v2 2/2] x86/panic: Add x86_panic_handler as default
 post-panic behavior

On 2025-04-29, Carlos Bilbao <carlos.bilbao.osdev@...il.com> wrote:
>> I see no reason why you don't just use safe_halt() as your panic
>> handler.
>
> Yes, in my original implementation I simply used halt, but I was
> trying to be cautious in case any remaining messages hadn't flushed. I
> wonder, can we be certain that, as you said, all output (e.g., a
> backtrace) has already been displayed on screen at this point? I'm not
> sure.

Well, without this series, the kernel goes into an infinite loop. So if
the messages are not all out, they won't magically appear during the
infinite loop either.

John