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

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Message-Id: <201005272221.08985.rjw@sisk.pl>
Date:	Thu, 27 May 2010 22:21:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Jaswinder Singh Rajput <jaswinderlinux@...il.com>,
	Sam Ravnborg <sam@...nborg.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 Thursday 27 May 2010, Geert Uytterhoeven wrote:
> On Thu, May 27, 2010 at 07:31, Randy Dunlap <rdunlap@...otime.net> wrote:
> > On Thu, 27 May 2010 12:31:23 +0800 Américo Wang wrote:
> >> On Thu, May 27, 2010 at 09:39:51AM +0530, Jaswinder Singh Rajput wrote:
> >> >On Thu, May 27, 2010 at 5:43 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> >> On Thursday 27 May 2010, 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.
> >> >>
> >> >> Try 'linux32 make menuconfig' and 'linux32 make'.
> >> >>
> >> >
> >> >Yes, this works :-)
> >>
> >>
> >> I think 'make ARCH=i386 menuconfig' also works.
> >
> > Yes, that's what I use.  I wasn't familiar with the "linux32 make ..." usage.
> 
> Doesn't the linux32 trick run the (possibly slower due to x86 register pressure)
> 32-bit compiler instead of running the 64-bit compiler in -m32 mode?

You're probably right, but I haven't noticed a difference yet. :-)

Rafael
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