linux-kernel - Re: [PATCH] panic, vt: do not force oops output when panic

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Message-Id: <20110706163312.17c104dc.akpm@linux-foundation.org>
Date:	Wed, 6 Jul 2011 16:33:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mandeep Singh Baines <msb@...omium.org>
Cc:	Huang Ying <ying.huang@...el.com>, Andi Kleen <ak@...ux.intel.com>,
	Hugh Dickins <hughd@...omium.org>,
	Olaf Hering <olaf@...fle.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Dave Airlie <airlied@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] panic, vt: do not force oops output when panic_timeout
 < 0

On Wed, 22 Jun 2011 15:30:39 -0700
Mandeep Singh Baines <msb@...omium.org> wrote:

> Mandeep Singh Baines (msb@...omium.org) wrote:
> > Avoid risk (of screen_unblank) and wasted cycles unblanking if
> > you intend to reboot immediately.
> > 
> 
> The original patch doesn't work. It worked fine when I tested with
> a serial port. When I disabled the serial out, my machine started to
> get wedged on a panic. I guess screen_unblank was in bust_spinlocks
> for a reason. It probably bust some spin_locks somewhere.
> 
> Below is a replacement for this patch which calls screen_unblank but
> does not force output when the panic timeout is negative (no wait).
> 
> -- >8 -- (snip)
> 
> Don't force output if you intend to reboot immediately.
> 
> This patch depends on:
> 
> http://lkml.kernel.org/r/1308612129-12488-1-git-send-email-msb@chromium.org

Please fold this into that and resend the patch series.  Please add
the needed update to Documentation/kernel-parameters.txt.
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