linux-kernel - Re: [RFC/PATCH-mm] i8042: activate panic blink only in X

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Message-ID: <20060904230358.GC1614@rhlx01.fht-esslingen.de>
Date:	Tue, 5 Sep 2006 01:03:58 +0200
From:	Andreas Mohr <andi@...x01.fht-esslingen.de>
To:	Grant Coady <gcoady.lk@...il.com>
Cc:	Andi Kleen <ak@...e.de>, Dmitry Torokhov <dtor@...ightbb.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH-mm] i8042: activate panic blink only in X

Hi,

On Tue, Sep 05, 2006 at 08:29:09AM +1000, Grant Coady wrote:
> If possible, kill the console blank timer too?  (dunno if you have).
> 
> Example: Oops screen on 2.4 recently I paged up to where the fault 
> started, the screen blanker kicked in while I was hand copying info 
> and wiped previous screens :(  Caused significant delay in working 
> out what the issue was (slackware-10.2 2.4.33.1 glibc nptl boo-boo).
> 
> Is it safe / easy to do on oops/panic?

It should be as easy as e.g. doing a

int system_oopsed __read_mostly = 0;

if (!system_oopsed)
    blank();

in the timer handler as opposed to painfully deregistering the whole handler
in the critical system state after an OOPS.
A funny side effect is that this way even improves system stability
after OOPS, since the blanking (which doesn't happen then)
might bomb, too ;)

Andreas Mohr
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