linux-kernel - Re: [PATCH 2/4] i386 GDT cleanups: Use per-cpu GDT immediately upon boot

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Message-ID: <m1wt1abkuo.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 21 Mar 2007 10:51:59 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] i386 GDT cleanups: Use per-cpu GDT immediately upon boot

Rusty Russell <rusty@...tcorp.com.au> writes:

> On Wed, 2007-03-21 at 03:31 -0600, Eric W. Biederman wrote:
>> Rusty Russell <rusty@...tcorp.com.au> writes:
>> > -/*
>> > - * The boot_gdt_table must mirror the equivalent in setup.S and is
>> > - * used only for booting.
>> > - */
>> 
>> It looks like you are killing a useful comment here for no good reason.
>
> Hi Eric,
>
> 	I think one has to look harder, then.  There is no "equivalent in
> setup.S": there is no setup.S, and it's certainly not clear what GDT
> this "must mirror": it doesn't mirror any GDT at the moment.

see the gdt in:
arch/i386/boot/setup.S

> 	This leaves us with "is only used for booting".  The name
> "boot_gdt_table" and the code itself are pretty clear.
>
> 	A comment might well deserve to live here, but not this one 8)
>
> Hope that clarifies,

Some of your confusion at least.

If anything the comment should read these values are fixed by the boot
protocol and we can't change them.

Eric
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