linux-kernel - Re: Please revert 21564fd2a3deb48200b595332f9ed4c9f311f2a7

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Message-ID: <20070709105123.1df728b2@the-village.bc.nu>
Date:	Mon, 9 Jul 2007 10:51:23 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Please revert 21564fd2a3deb48200b595332f9ed4c9f311f2a7

On Sun, 08 Jul 2007 19:46:46 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Adrian Bunk wrote:
> >>> Reverting is safe since it simply re-establishes the 2.6.21 status quo.
> >>>       
> >> Well, not really.  It breaks any non-GPL module when CONFIG_PARAVIRT is
> >> enabled, even though the same module would work fine otherwise.  That's
> >> a pretty large regression.
> >> ...
> >>     
> >
> > The 2.6.21 status quo can by definition not be a regression compared
> > to 2.6.21.
> >   
> 
> 2.6.21's behaviour was a bug.  CONFIG_PARAVIRT is not supposed to cause 
> any behavioural changes.

2.6.22's behaviour is the bug. 2.6.21 you couldn't load random binary
crap into the kernel without logging a taint. 2.6.22 you can. This means
every single 2.6.22 bug report has to be assumed to be caused by binary
module crap as a starting point which slows down debug immensely.

Alan
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