linux-kernel - Re: [PATCH 4/33] i386: CONFIG_PHYSICAL

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Message-ID: <m164hbru7e.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 02 Aug 2006 10:14:13 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	fastboot@...l.org, linux-kernel@...r.kernel.org,
	Horms <horms@...ge.net.au>,
	Jan Kratochvil <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>
Subject: Re: [PATCH 4/33] i386: CONFIG_PHYSICAL_START cleanup

Sam Ravnborg <sam@...nborg.org> writes:

> On Tue, Aug 01, 2006 at 05:03:19AM -0600, Eric W. Biederman wrote:
>> Defining __PHYSICAL_START and __KERNEL_START in asm-i386/page.h works but
>> it triggers a full kernel rebuild for the silliest of reasons.  This
>> modifies the users to directly use CONFIG_PHYSICAL_START and linux/config.h
>> which prevents the full rebuild problem, which makes the code much
>> more maintainer and hopefully user friendly.
>> 
>> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
>> ---
>>  arch/i386/boot/compressed/head.S |    8 ++++----
>>  arch/i386/boot/compressed/misc.c |    8 ++++----
>>  arch/i386/kernel/vmlinux.lds.S   |    3 ++-
>>  include/asm-i386/page.h          |    3 ---
>>  4 files changed, 10 insertions(+), 12 deletions(-)
>> 
>> diff --git a/arch/i386/boot/compressed/head.S
> b/arch/i386/boot/compressed/head.S
>> index b5893e4..8f28ecd 100644
>> --- a/arch/i386/boot/compressed/head.S
>> +++ b/arch/i386/boot/compressed/head.S
>> @@ -23,9 +23,9 @@
>>   */
>>  .text
>>  
>> +#include <linux/config.h>
>
> You already have full access to all CONFIG_* symbols - kbuild includes
> it on the commandline. So please kill this include.

Stupid questions:
- Why do we still have a linux/config.h if it is totally redundant.
- Why don't we have at least a #warning in linux/config.h that would
  tell us not to include it.
- Why do we still have about 200 includes of linux/config.h in the
  kernel tree?

I would much rather have a compile error, or at least a compile
warning rather than needed a code review to notice this error.

We haven't needed this header since october of last year.

Eric
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