linux-kernel - Re: [PATCH 2/2] Enable 'make CONFIG

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Message-ID: <1312097621.22074.71.camel@i7.infradead.org>
Date:	Sun, 31 Jul 2011 08:33:39 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [PATCH 2/2] Enable 'make CONFIG_FOO=y oldconfig'

On Sat, 2011-07-30 at 21:06 -0400, Arnaud Lacombe wrote:
> The principle of least surprise is broken anyway as the proposed patch
> has absolutely no dependency checking and verification. You can `make
> CONFIG_SATA_MV=y allnoconfig', you will _not_ get it set.

That's always true in kconfig *anyway*. We've *never* really had an
option for "do whatever you need to enable this option". We've even
hard-coded this failure in our language, by introducing this horrible
'select' thing to work around it.

I'd no more expect that, than I would for it to write the code for me if
I type 'make CONFIG_BTRFSv2=y oldconfig'.

So no, it doesn't violate the principle of least surprise.

> ok, the issue is that you will only be allowed to change visible
> symbols. CONFIG_64BIT is conditionally visible (when ARCH=x86), so
> right now, you can not do on x86-64:
> 
> % make ARCH=i386 defconfig
> % make CONFIG_64BIT=n oldconfig # [0]

That works fine here. What was ARCH set to in your second test? If it's
ARCH=x86_64 then that's expected. That's the whole point of my *other*
patch to make 'ARCH=x86' be the default, so that the value of
CONFIG_64BIT in your .config is *not* forcibly overridden to match the
build host. That's a *separate* bug, which I also have a patch for.

-- 
dwmw2

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