linux-kernel - Re: [Xen-devel] [PATCH 05/10] xen/setup: Set identity mapping for non-RAM E820 and E820 gaps.

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Date:	Wed, 22 Dec 2010 08:49:33 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"hpa@...or.com" <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad@...nel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Jan Beulich <JBeulich@...ell.com>
Subject: Re: [Xen-devel] [PATCH 05/10] xen/setup: Set identity mapping for
 non-RAM E820 and E820 gaps.

On Tue, 2010-12-21 at 21:37 +0000, Konrad Rzeszutek Wilk wrote:
> @@ -254,6 +282,12 @@ char * __init xen_memory_setup(void)
>  
>         xen_add_extra_mem(extra_pages);
>  
> +       /*
> +        * Set P2M for all non-RAM pages and E820 gaps to be identity
> +        * type PFNs.
> +        */
> +       printk(KERN_INFO "Set %ld page(s) to 1-1 mapping.\n",
> +               xen_set_identity(&e820)); 

I had to look at this patch twice to find the caller of the
xen_set_identity function here. I think spending a variable here would
be worth the improved clarity.

Ian.

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