linux-kernel - Re: [patch 23/26] Xen-paravirt_ops: Add Xen grant table support

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Date:	Fri, 16 Mar 2007 09:51:07 +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>,
	Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>
Subject: Re: [patch 23/26] Xen-paravirt_ops: Add Xen grant table support


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

> Add Xen 'grant table' driver which allows granting of access to 
> selected local memory pages by other virtual machines and, 
> symmetrically, the mapping of remote memory pages which other virtual 
> machines have granted access to.
> 
> This driver is a prerequisite for many of the Xen virtual device 
> drivers, which grant the 'device driver domain' restricted and 
> temporary access to only those memory pages that are currently 
> involved in I/O operations.

> +
> +#ifndef __ia64__
> +	{

introduce a proper arch method instead.

> +	unsigned long flags;
> +	int ref;
> +	grant_ref_t head;
> +	spin_lock_irqsave(&gnttab_list_lock, flags);

> +	unsigned long flags;
> +	spin_lock_irqsave(&gnttab_list_lock, flags);

> +	unsigned long flags;
> +	int count = 1;
> +	if (head == GNTTAB_LIST_END)

> +	grant_ref_t g = *private_head;
> +	if (unlikely(g == GNTTAB_LIST_END))

coding style problems.

	Ingo
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