linux-kernel - Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

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Message-ID: <b609cb3b0803060737xa0c3c0byb51d51af797eb81f@mail.gmail.com>
Date:	Thu, 6 Mar 2008 10:37:21 -0500
From:	NightStrike <nightstrike@...il.com>
To:	"Olivier Galibert" <galibert@...ox.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Chris Lattner" <clattner@...le.com>,
	"Michael Matz" <matz@...e.de>,
	"Richard Guenther" <richard.guenther@...il.com>,
	"Joe Buck" <Joe.Buck@...opsys.com>, "Jan Hubicka" <hubicka@....cz>,
	"Aurelien Jarno" <aurelien@...el32.net>,
	linux-kernel@...r.kernel.org, gcc@....gnu.org
Subject: Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

On 3/6/08, Olivier Galibert <galibert@...ox.com> wrote:
> On Wed, Mar 05, 2008 at 05:12:07PM -0800, H. Peter Anvin wrote:
> > It's a kernel bug, and it needs to be fixed.
>
> I'm not convinced.  It's been that way for 15 years, it's that way in
> the BSD kernels, at that point it's a feature.  The bug is in the
> documentation, nowhere else.  And in gcc for blindly trusting the
> documentation.

The issue should not be evaluated as: "It's always been that way,
therefore, it's right."  Instead, it should be: "What's the right way
to do it?"

You don't just change documentation because no existing code meets the
requirement -- UNLESS -- the non-conforming code is actually the right
way to do things.
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