linux-kernel - Re: [PATCH v3] x86, kconfig: Default to ARCH=x86 to avoid overriding CONFIG

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Date:	Sat, 30 Jul 2011 12:33:02 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Michal Marek <mmarek@...e.cz>, "Ted Ts'o" <tytso@....edu>,
	Ingo Molnar <mingo@...e.hu>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	hpa@...or.com
Subject: Re: [PATCH v3] x86, kconfig: Default to ARCH=x86 to avoid overriding CONFIG_64BIT

Hi,

On Sat, Jul 30, 2011 at 12:19 PM, David Woodhouse <dwmw2@...radead.org> wrote:
> On Sat, 30 Jul 2011, Arnaud Lacombe wrote:
>
>> this is breaking ARCH=um.
>
> Breaking in what way?
from arch/um/Makefile:
[...]
include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)

with the following Makefile-$(SUBARCH) available:

% ls arch/um/Makefile-*
[...] arch/um/Makefile-i386  arch/um/Makefile-x86_64

> Is it just that ARCH=um is broken for SUBARCH=x86,
> and needed to be updated anyway?
>
well, from my point of view, it do not need to be updated. Your patch
corrupt SUBARCH's purpose, that is:

# SUBARCH tells the usermode build what the underlying arch is.

Changing it will start to be really intrusive...

> And still works is you manually set
> SUBARCH to one of the legacy values?
>
no. the toplev Makefile use a direct immediate assignment, not a
conditional one.

 - Arnaud

> I'll try to reproduce and take a look later thuis evening.
>
> --
> dwmw2
>
>
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