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

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Message-ID: <BANLkTik36rFNDqAorY9gn2_mDPMmP_Y=iw@mail.gmail.com>
Date:	Mon, 30 May 2011 16:30:14 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	David Woodhouse <dwmw2@...radead.org>,
	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...e.hu>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix corruption of CONFIG_X86_32 in 'make oldconfig'

Hi,

On Mon, May 30, 2011 at 2:40 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Monday 30 May 2011 19:27:31 Randy Dunlap wrote:
>> On Mon, 30 May 2011 13:05:58 +0200 Arnd Bergmann wrote:
>>
>> Ingo recently wrote:
>> | When it wont boot straight away (often it does) i use a
>> | Kconfig-needed set of minimal set of configs that enables the minimal
>> | hardware environment.
>>
>> which I believe is the same method that is documented in
>> Documentation/kbuild/kconfig.txt, subject "KCONFIG_ALLCONFIG": (partial text)
>>
>> This enables you to create "miniature" config (miniconfig) or custom
>> config files containing just the config symbols that you are interested
>> in.  Then the kernel config system generates the full .config file,
>> including symbols of your miniconfig file.
>>
>> This 'KCONFIG_ALLCONFIG' file is a config file which contains
>> (usually a subset of all) preset config symbols.  These variable
>> settings are still subject to normal dependency checks.
>>
>
> Very nice, I didn't know about it. Unfortunately, this seems to
> suffer from the same problem as the generic "randconfig" -- it
> ignores all "choice" statements and just uses the default:
>
> Try for instance
>
> KCONFIG_ALLCONFIG=arch/arm/configs/omap2plus_defconfig make \
>        O=obj-allmod/ allnoconfig ARCH=arm
>
> This is supposed to set CONFIG_ARCH_OMAP, but it instead chooses
> CONFIG_ARCH_VERSATILE, which means it's still useless for me.
>
hum...

% git describe
v2.6.39

% KCONFIG_ALLCONFIG=arch/arm/configs/omap2plus_defconfig make ARCH=arm
allnoconfig
scripts/kconfig/conf --allnoconfig Kconfig
arch/arm/configs/omap2plus_defconfig:92:warning: symbol value 'm'
invalid for BT_L2CAP
arch/arm/configs/omap2plus_defconfig:93:warning: symbol value 'm'
invalid for BT_SCO
warning: (ARCH_STMP3XXX && ARCH_OMAP3 && ARCH_OMAP4) selects
USB_ARCH_HAS_EHCI which has unmet direct dependencies (USB_SUPPORT)
warning: (ARCH_OMAP4) selects PL310_ERRATA_588369 which has unmet
direct dependencies (CACHE_L2X0)
warning: (ARCH_OMAP4) selects PL310_ERRATA_727915 which has unmet
direct dependencies (CACHE_L2X0)
#
# configuration written to .config
#

% grep CONFIG_ARCH_OMAP .config
CONFIG_ARCH_OMAP=y
# CONFIG_ARCH_OMAP1 is not set
CONFIG_ARCH_OMAP2PLUS=y
# CONFIG_ARCH_OMAP2PLUS_TYPICAL is not set
CONFIG_ARCH_OMAP2=y
CONFIG_ARCH_OMAP3=y
CONFIG_ARCH_OMAP4=y

did I missed something ?

 - Arnaud
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