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

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Date:	Fri, 28 May 2010 03:37:00 +0530
From:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	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

Hello Sam,

On Fri, May 28, 2010 at 12:16 AM, Sam Ravnborg <sam@...nborg.org> wrote:
> On Thu, May 27, 2010 at 11:49:16AM -0400, Christoph Hellwig wrote:
>> On Thu, May 27, 2010 at 05:37:36AM +0530, Jaswinder Singh Rajput wrote:
>> > Hello,
>> >
>> > I am trying to build 32 bit kernel image on 64-bit machine but after
>> > 'make menuconfig' it automatically switches 32-bit to 64-bit.
>> >
>> > Is this a BUG or did intentionally.
>>
>> I think it's intentional, but I'm really annoyed by this behaviour.
>
> The request when we did the merge of 32 and 64 bit was that we
> should continue to build 64bit kernels on 64 bit machines.
> And likewise for 32bit.
> Because this was what the users where used to.
>
> We could simplify metters by defining new rules.
> As you suggest that uname on an intel box always resulted in ARCH=x86.
> But then people would complain why a 32 bit kernel is default when
> the box is 64 bit.
>
> Something like this:
> [The escape chars align nicely in the patched Makefile]
>
>        Sam
>
> diff --git a/Makefile b/Makefile
> index ebc8225..e7f97a5 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -161,10 +161,11 @@ export srctree objtree VPATH
>  # then ARCH is assigned, getting whatever value it gets normally, and
>  # SUBARCH is subsequently ignored.
>
> -SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
> -                                 -e s/arm.*/arm/ -e s/sa110/arm/ \
> +SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/        \
> +                                 -e s/sun4u/sparc64/                    \
> +                                 -e s/arm.*/arm/ -e s/sa110/arm/        \
>                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
> -                                 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
> +                                 -e s/ppc.*/powerpc/ -e s/mips.*/mips/  \
>                                  -e s/sh[234].*/sh/ )
>
>  # Cross compiling and selecting different set of gcc/bin-utils
>
>

Thanks, this patch fixes the issue. Now 'make menuconfig' is following .config.

Thanks,
--
Jaswinder Singh.
--
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