linux-kernel - Re: [PATCH] init: support preset lpj value as config option

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Message-ID: <20070126184628.GY10108@waste.org>
Date:	Fri, 26 Jan 2007 12:46:28 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Tim Bird <tim.bird@...sony.com>
Cc:	Andrew Morton <akpm@...l.org>, Paul Mundt <lethal@...ux-sh.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] init: support preset lpj value as config option

On Fri, Jan 26, 2007 at 10:29:24AM -0800, Tim Bird wrote:
> Andrew Morton wrote:
> >> i386 is missing CONFIG_CMDLINE support, and this architecture
> >> is used in embedded.
> > 
> > So if we add CONFIG_CMDLINE we fix this problem and we bring i386 into line
> > with other platforms.  It's all good.
> > 
> >>  I think many other x86 derivatives are
> >> also missing .config-based command line support.  CELF has
> >> worked to get patches submitted to fix this, but so far these
> >> haven't been accepted.
> > 
> > You have?
> > 
> > <looks at inbox>
> > 
> > To whom?
> 
> Matt Mackall would know better than I.  He's the person
> CELF hired to do this.  Here are some of the previous LKML
> discussions around this issue:
> 
> http://lkml.org/lkml/2006/6/11/115
> 
> http://lkml.org/lkml/2006/7/31/208
> 
> Last time I talked to Matt about this (some time in
> November, I believe), he said he had worked out a
> solution agreeable to H. Peter Anvin, who had issues
> with the original submission.  I'm not sure if that
> latest solution was submitted to mainline or not.

The idea was to allow putting something like "%s" in the built-in
command line and expanding that with the provided command line. This
allows you to append/prepend/ignore the provided command line as you
desire.

This is a fair bit more complicated than what the existing
implementations of CONFIG_CMDLINE are doing and details like
early_cmdline handling don't help matters. Haven't yet come up with an
implementation I'm happy with.

-- 
Mathematics is the supreme nostalgia of our time.
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