linux-kernel - Re: [patch v2] Fixes and cleanups for earlyprintk aka boot console.

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Date:	Tue, 24 Apr 2007 10:27:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>,
	Ralf Baechle <ralf@...ux-mips.org>, Andi Kleen <ak@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [patch v2] Fixes and cleanups for earlyprintk aka boot console.

On Tue, 24 Apr 2007 16:04:16 +0200 Gerd Hoffmann <kraxel@...hat.com> wrote:

> > I get this, across netconsole:
> > 
> > [17179569.184000] console handover: boot [earlyvga_f._0] -> real [tty0]
> > 
> > wanna take a look at why there's cruft in bootconsole->name please?
> 
> -EFULL ;)
> 
> "earlyvga" is 8 chars.  struct console->name is char[8].  No space left 
> for the trailing ´\0´, the cruft comes from the next field (write 
> function pointer).  Obviously nobody ever printed the early console 
> names before.

doh.

> Hmm.  We can make the names shorter.  We can make the name field longer 
> (probably 16, it ends up taking that much anyway due to aligments at 
> least on 64bit).  This looks best to me.  We could also use 
> printk("%.8s",name) to make printk stop after 8 chars, but I somehow 
> don't like hardcoding the length like this ...
> 

yup, making it 16 sounds simplest.  I'll do the patch, thanks.
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