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

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Date:	Fri, 15 Jul 2011 15:57:07 -0700
From:	Mandeep Singh Baines <msb@...omium.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mandeep Singh Baines <msb@...omium.org>,
	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

Andrew Morton (akpm@...ux-foundation.org) wrote:
> 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.

Done:

http://lkml.kernel.org/r/1310770401-10739-1-git-send-email-msb@chromium.org
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