linux-kernel - Re: [PATCH 1/1] Make sure that any oops is flushed to the mtdoops console

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Message-Id: <1225458328.16867.23.camel@viktor.research.nokia.com>
Date:	Fri, 31 Oct 2008 15:05:28 +0200
From:	Viktor Rosendahl <Viktor.Rosendahl@...ia.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH 1/1] Make sure that any oops is flushed to the mtdoops
	console

On Thu, 2008-10-30 at 13:17 -0700, ext Andrew Morton wrote: 
> On Wed, 22 Oct 2008 18:16:28 +0300
> Viktor Rosendahl <viktor.rosendahl@...ia.com> wrote:
<clip> 
> >  void __attribute__((weak)) bust_spinlocks(int yes)
> > @@ -22,6 +23,7 @@ void __attribute__((weak)) bust_spinlocks(int yes)
> >  #ifdef CONFIG_VT
> >  		unblank_screen();
> >  #endif
> > +		console_unblank();
> >  		if (--oops_in_progress == 0)
> >  			wake_up_klogd();
> >  	}
> 
> That looks logical.  From my reading we can now remove that
> unblank_screen(), because the console_unblank() will call
> vt_console_driver.unblank() for us?

For some reason, we did not think about it here when the N810 kernel was
fixed. It looks good to me but if you do it, then there will be a slight
difference in behavior, since console_unblank() will call
vt_console_driver.unblank() only if the console_sem can be acquired,
otherwise it just returns without doing anything.

Maybe console_unblank() should be changed to not care too much about the
console_sem if an oops is in progress? 

best regards,

Viktor


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