linux-kernel - Re: config automatically switches from 32-bit to 64-bit for x86

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Date:	Fri, 04 Jun 2010 09:53:41 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: config automatically switches from 32-bit to 64-bit for x86

On 4.6.2010 08:23, Jaswinder Singh Rajput wrote:
> Hello Michal and Sam,
> 
> On Thu, Jun 3, 2010 at 7:00 PM, Michal Marek <mmarek@...e.cz> wrote:
>> What about always making the prompt visible, so that the previously set
>> value gets reused? The downside is that 'make ARCH=i386 menuconfig' in a
>> clean tree on x86_64 will default to 64bit, because it will find the
>> setting in the config of the running 64bit kernel :(. But after manually
>> turning CONFIG_64BIT off, the setting will be preserved.
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index dcb0593..05ec418 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -3,7 +3,7 @@ mainmenu "Linux Kernel Configuration for x86"
>>
>>  # Select 32 or 64 bit
>>  config 64BIT
>> -       bool "64-bit kernel" if ARCH = "x86"
>> +       bool "64-bit kernel"
>>        default ARCH = "x86_64"
>>        ---help---
>>          Say yes to build a 64-bit kernel - formerly known as x86_64
>>
> 
> This patch works !!

Does
$ make mrproper
$ make ARCH=i386 menuconfig
on x86_64 also work for you? Here, it takes CONFIG_64BIT=y from
/boot/config-`uname -r`. I see no easy way to solve this atm.

Michal
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