From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: [PATCH 1 of 5] Nested p2m: implement "flush" as a
	first-class action
Date: Thu, 30 Jun 2011 11:51:05 +0200
Message-ID: <20110630095105.GA9431@aepfle.de>
References: <patchbomb.1309171570@whitby.uk.xensource.com>
	<44c7b977302663487922.1309171571@whitby.uk.xensource.com>
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To: Tim Deegan <Tim.Deegan@citrix.com>
Cc: Christoph Egger <Christoph.Egger@amd.com>, xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

On Mon, Jun 27, Tim Deegan wrote:

> diff -r b24018319772 -r 44c7b9773026 xen/arch/x86/mm/p2m.c
> --- a/xen/arch/x86/mm/p2m.c	Thu Jun 23 18:34:55 2011 +0100
> +++ b/xen/arch/x86/mm/p2m.c	Fri Jun 24 16:24:44 2011 +0100
> @@ -1050,20 +1050,41 @@ p2m_getlru_nestedp2m(struct domain *d, s
>      return lrup2m;
>  }
>  
> -static int 
> +/* Reset this p2m table to be empty */
> +static void
>  p2m_flush_locked(struct p2m_domain *p2m)
>  {
> -    ASSERT(p2m);
> -    if (p2m->cr3 == CR3_EADDR)
> -        /* Microoptimisation: p2m is already empty.
> -         * => about 0.3% speedup of overall system performance.
> -         */
> -        return 0;
> +    struct page_info *top, *pg;
> +    struct domain *d = p2m->domain;

Tim,

one of these changes causes a build error:
p2m.c:1105:20: error: unused variable 'd' [-Werror=unused-variable]

Olaf