Re: [PATCH] panic, vt: do not force oops output when panic_timeout< 0

[Andrew Morton]

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

> Mandeep Singh Baines (msb@xxxxxxxxxxxx) 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@xxxxxxxxxxxx

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