From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: [PATCH 00/11] x86: support up to 16Tb
Date: Wed, 23 Jan 2013 10:16:35 +0000
Message-ID: <CD256903.59788%keir@xen.org>
References: <50FFC1E102000078000B89AA@nat28.tlf.novell.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <50FFC1E102000078000B89AA@nat28.tlf.novell.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: Jan Beulich <JBeulich@suse.com>
Cc: xen-devel <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

On 23/01/2013 09:56, "Jan Beulich" <JBeulich@suse.com> wrote:

>>>> On 23.01.13 at 10:33, Keir Fraser <keir@xen.org> wrote:
>> There's an 'ifdef PAGE_LIST_NULL' in patch 11 in x86/setup.c. Is that really
>> needed?
> 
> That's there so that once we go beyond 16Tb the code won't need
> to change. In particular, because of the implied growth of struct
> page_info, I'm envisioning such support to become optional (to be
> enabled at build time).

Defer the ifdef until it's needed, then when it's added its in the sensible
place (ie. where PAGE_LIST_NULL really does become build-time optional).

 -- Keir

> Jan
>