linux-kernel - Re: [patch 14/26] Xen-paravirt_ops: add common patching machinery

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Date:	Fri, 16 Mar 2007 10:20:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [patch 14/26] Xen-paravirt_ops: add common patching machinery


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Implement the actual patching machinery.  paravirt_patch_default() 
> contains the logic to automatically patch a callsite based on a few 
> simple rules:
> 
>  - if the paravirt_op function is paravirt_nop, then patch nops
>  - if the paravirt_op function is a jmp target, then jmp to it
>  - if the paravirt_op function is callable and doesn't clobber too much
>     for the callsite, call it directly
> 
> paravirt_patch_default is suitable as a default implementation of 
> paravirt_ops.patch, will remove most of the expensive indirect calls 
> in favour of either a direct call or a pile of nops.

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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