linux-kernel - Re: [patch 03/26] Xen-paravirt_ops: use paravirt_nop to consistently mark no-op operations

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Date:	Fri, 16 Mar 2007 10:44:32 +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>
Subject: Re: [patch 03/26] Xen-paravirt_ops: use paravirt_nop to consistently mark no-op operations


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

> Add a _paravirt_nop function for use as a stub for no-op operations, 
> and paravirt_nop #defined void * version to make using it easier 
> (since all its uses are as a void *).
> 
> This is useful to allow the patcher to automatically identify noop 
> operations so it can simply nop out the callsite.

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

> +void _paravirt_nop(void);
> +#define paravirt_nop	((void *)_paravirt_nop)

but only as a cleanup of the current open-coded (void *) casts. My 
problem with this is that it loses the types. Not that there is much to 
check for, but still, this adds some assumptions about how function 
calls look like.

	Ingo
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