linux-kernel - Re: [patch 1/5] Add comments to the PDA structure to annotate offsets

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Message-Id: <200607282052.20559.ak@suse.de>
Date:	Fri, 28 Jul 2006 20:52:20 +0200
From:	Andi Kleen <ak@...e.de>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [patch 1/5] Add comments to the PDA structure to annotate offsets

On Friday 28 July 2006 20:43, Arjan van de Ven wrote:
> On Fri, 2006-07-28 at 20:41 +0200, Andi Kleen wrote:
> > On Friday 28 July 2006 18:03, Arjan van de Ven wrote:
> > > Subject: [patch 1/5] Add comments to the PDA structure to annotate
> > > offsets From: Arjan van de Ven <arjan@...ux.intel.com>
> >
> > So why exactly do you think these numbers need to be documented?
> >
> > If there is a reason there should be a comment in the code.
> >
> > Nobody should use fixed numbers, but always get the current ones
> > from asm-offset
>
> the 40 one is a gcc ABI one (same offset as userland); 

Ah sounds ugly. Wasn't it possible to pass that as an option
to gcc?

> that is 
> documented in the later patch

I still hate the numbers. Perhaps do them only before your canary.
Also you should have a BUILD_BUG_ON() for this somewhere

-Andi
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