linux-kernel - Re: [PATCH] powerpc/lpar - defer prefered console setup

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Date:	Tue, 29 Jul 2008 10:07:27 +0200
From:	Bastian Blank <waldi@...ian.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linuxppc-dev@...abs.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/lpar - defer prefered console setup

On Tue, Jul 29, 2008 at 05:43:24PM +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2008-07-29 at 09:36 +0200, Bastian Blank wrote:
> > On Tue, Jul 29, 2008 at 01:06:18PM +1000, Benjamin Herrenschmidt wrote:
> > > On Mon, 2008-07-28 at 20:56 +0200, Bastian Blank wrote:
> > > > Hi
> > > > 
> > > > The powerpc lpar code adds a prefered console at a very early state,
> > > > during arch_setup. This runs even before the console setup from the
> > > > command line and takes preference.
> > > > 
> > > > This patch moves the prefered console setup into an arch_initcall which
> > > > runs later and allows the specification of the correct console on the
> > > > command line. The udbg console remains as boot console.
> > > > 
> > > Shouldn't it be a console_initcall() ? 
> > 
> > No. console_initcall is for the initial console setup and runs way long
> > before the command line setup. It needs to run after that.
> 
> Hrm... we do most of the console discovery from console_initcall for
> legacy UARTs. see the code in legacy_serial.c, we just avoid doing
> the add_preferred_console() thingy if there's a console= on the command
> line :-)

The code did that, but the check was removed because it trips on
netconsole=. See 5faae2e5d1f53df9dce482032c8486bc3a1feffc.

Bastian

-- 
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