linux-kernel - Re: [PATCH] Fix corruption of CONFIG_X86

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Message-ID: <1306753618.2029.447.camel@i7.infradead.org>
Date:	Mon, 30 May 2011 12:06:56 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Theodore Tso <tytso@....EDU>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix corruption of CONFIG_X86_32 in 'make oldconfig'

On Mon, 2011-05-30 at 12:58 +0200, Ingo Molnar wrote:
> 
> * Theodore Tso <tytso@....EDU> wrote:
> 
> > I'd think that "make ARCH=x86_64 oldconfig"
> > 
> > ... where the old configuration contained CONFIG_X86_32
> > should trigger a warning, if not an outright error that 
> > stops the build....
> 
> That would be a rather sad regression for me: i use that command 
> regularly to transform .configs that came in bugreports into a config 
> suitable for a testbox that has a different bitness userspace 
> installed. 

And if it has a different SCSI or ATA controller? Then you need
something like:

	'make CONFIG_SATA_MV=y oldconfig'

to make your config actually useful.

Which only goes to reinforce my point that CONFIG_64BIT *isn't* that
special.

Yes, we should fix the tools so that it's easy to *fix* certain settings
when running randconfig/oldconfig/all*config. That addresses *all* your
examples that you posted in a separate mail, doesn't it?

Without being a dirty hack which only works for *one* setting
(CONFIG_64BIT), and only works on *one* architecture (there is no
equivalent ARCH= hack for setting CONFIG_64BIT on
powerpc/mips/sparc/sh/parisc).

-- 
dwmw2

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