linux-kernel - Re: Please revert 21564fd2a3deb48200b595332f9ed4c9f311f2a7

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Date:	Mon, 09 Jul 2007 07:06:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Andi Kleen <ak@...e.de>, Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Please revert 21564fd2a3deb48200b595332f9ed4c9f311f2a7

Alan Cox wrote:
> There were a considerable number of sensible logical objections. You just
> didn't agree with them. You've now effectively made .22 unsupportable
> since we don't know if someone has binary virtualiser crap loaded.

The pv_ops infrastructure doesn't support modular pv_ops 
implementations, and if it did, there's certainly no intention of 
supporting non-GPL implementations.

At the same time that all the other altinstruction patching happens, it 
converts any indirect calls via paravirt_ops into direct calls to the 
target function, bypassing struct paravirt_ops altogether.  After that 
the structure is pretty much only used for patching modules.  Any 
attempt at writing a modular pv_ops implementation would fail as a result.

    J
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