linux-kernel - Re: [PATCH] Bugfix for VMI paravirt ops

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Message-ID: <461590EA.10605@goop.org>
Date:	Thu, 05 Apr 2007 17:14:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
CC:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH] Bugfix for VMI paravirt ops

Zachary Amsden wrote:
> No, they are totally dependent.  The reason interrupts are disabled is
> to stop kmap_atomic in interrupt handlers.  With the kmap_atomic_pte
> changes, the whole interrupt disable jibberish goes away. 

But kmap_atomic_pte is a special case of kmap_atomic for ptes. 
Interrupt routines can still use plain kmap_atomic for bouncebuffers and
so on.

A more general patch would be to make kmap/unmap_atomic pv_ops, and then
they can all be rolled together.  I.e: check the type to see if special
pte handling needs to happen, etc.

    J

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