linux-kernel - Re: [PATCH 0/8] x86 boot, pda and gdt cleanups

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Message-Id: <1173855267.19022.22.camel@localhost.localdomain>
Date:	Wed, 14 Mar 2007 17:54:26 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 0/8] x86 boot, pda and gdt cleanups

On Tue, 2007-03-13 at 21:39 -0700, Jeremy Fitzhardinge wrote:
> Rusty Russell wrote:
> > This is called "pissing in the corners".  Don't do it: we don't need to
> > touch that code and I actually prefer the original anyway (explicit is
> > *good*).  
> >
> > The habit of extracting cpu number once then using it is an optimization
> > which we should be aiming to get rid of (it simply hurts archs with
> > efficient per-cpu implementations).
> 
> No, that was for a reason.  I was worried about smp_processor_id() not
> returning valid values between init_gdt and cpu_set_gdt.  It's not
> actually a problem, but relying on smp_processor_id() while we're moving
> the foundations its based on seems fragile.

smp_processor_id() always works, so it's fundamental, not fragile.

However, we *should* remove the arg from cpu_set_gdt, since we have such
faith in smp_processor_id() 8)

Cheers,
Rusty.



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