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

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Date:	Thu, 22 Mar 2007 09:10:31 +0100
From:	Sébastien Dugué <sebastien.dugue@...l.net>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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


  Hi Rusty,

On Thu, 22 Mar 2007 10:58:30 +1100 Rusty Russell <rusty@...tcorp.com.au> wrote:

> On Wed, 2007-03-21 at 10:51 -0600, Eric W. Biederman wrote:
> > 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
> 
> Erk, what a dumb mistake.  Apologies for my snarky comment above 8(
> 
> > If anything the comment should read these values are fixed by the boot
> > protocol and we can't change them.
> 
> Since lguest doesn't use setup.S, it's outside my experience.  I'll just
> leave the comment, and try to pretend this never happened 8)
> 
> Thanks muchly,
> Rusty.
> ==
> Now we are no longer dynamically allocating the GDT, we don't need the
> "cpu_gdt_table" at all: we can switch straight from "boot_gdt_table"
> to the per-cpu GDT.  This means initializing the cpu_gdt array in C.


  Why not take on the opportunity to rename boot_gt_table to boot_gtd,
to avoid the duplicate T(able)?

  Sébastien.
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