From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH 02/12] mm: add 'foreign' alias for the
	'pinned' page flag
Date: Wed, 7 Jan 2015 12:12:11 -0500
Message-ID: <20150107171211.GA2664@l.oracle.com>
References: <1420570657-8203-1-git-send-email-david.vrabel@citrix.com>
	<1420570657-8203-3-git-send-email-david.vrabel@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta3.messagelabs.com ([195.245.230.39])
	by lists.xen.org with esmtp (Exim 4.72)
	(envelope-from <konrad.wilk@oracle.com>) id 1Y8u9e-0003tw-8b
	for xen-devel@lists.xenproject.org; Wed, 07 Jan 2015 17:12:22 +0000
Content-Disposition: inline
In-Reply-To: <1420570657-8203-3-git-send-email-david.vrabel@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Jenny Herbert <jennifer.herbert@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

On Tue, Jan 06, 2015 at 06:57:27PM +0000, David Vrabel wrote:
> From: Jenny Herbert <jennifer.herbert@citrix.com>
> 
> The foreign page flag will be used by Xen guests to mark pages that
> have grant mappings of frames from other (foreign) guests.
> 
> The foreign flag is an aliases the existing (Xen-specific) pinned

is an alias for the ..
> flag.  This is safe because pinned is only used on pages used for page
> tables and these cannot also be foreign.
> 
> Signed-off-by: Jenny Herbert <jennifer.herbert@citrix.com>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
> ---
>  include/linux/page-flags.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
> index e1f5fcd..7734cc8 100644
> --- a/include/linux/page-flags.h
> +++ b/include/linux/page-flags.h
> @@ -123,6 +123,7 @@ enum pageflags {
>  	/* XEN */
>  	PG_pinned = PG_owner_priv_1,
>  	PG_savepinned = PG_dirty,
> +	PG_foreign = PG_owner_priv_1,
>  
>  	/* SLOB */
>  	PG_slob_free = PG_private,
> @@ -215,6 +216,7 @@ __PAGEFLAG(Slab, slab)
>  PAGEFLAG(Checked, checked)		/* Used by some filesystems */
>  PAGEFLAG(Pinned, pinned) TESTSCFLAG(Pinned, pinned)	/* Xen */
>  PAGEFLAG(SavePinned, savepinned);			/* Xen */
> +PAGEFLAG(Foreign, foreign);				/* Xen */
>  PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
>  PAGEFLAG(SwapBacked, swapbacked) __CLEARPAGEFLAG(SwapBacked, swapbacked)
>  	__SETPAGEFLAG(SwapBacked, swapbacked)
> -- 
> 1.7.10.4
>