Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756283Ab0G0OfG (ORCPT ); Tue, 27 Jul 2010 10:35:06 -0400 Received: from smtp102.prem.mail.ac4.yahoo.com ([76.13.13.41]:23145 "HELO smtp102.prem.mail.ac4.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1756146Ab0G0OfE (ORCPT ); Tue, 27 Jul 2010 10:35:04 -0400 X-Yahoo-SMTP: _Dag8S.swBC1p4FJKLCXbs8NQzyse1SYSgnAbY0- X-YMail-OSG: _uVJN8gVM1kHSYbp9fJf7iRpCPE83jk2qVzlexPNes_C1Yv 0JFwqukcqk5xlO.H_9RiPl_0hLpGP8j405Ms5wFtKR.OD1khbPWE8D.2Jkqa os6HodcipOcD9_ovYUY2F7any4CsrPAxP8_dOPRXKJSRMorp0zhdvzYQ.Pvg zZW03ZGqzwRdde0GxCCYOLuKMrPP2Hiw2pwEYu7e5CMGSqF0_l1l1EQmgUCs VeHd6prUMJf.5fuEC1RLOzmeU2alQ X-Yahoo-Newman-Property: ymail-3 Date: Tue, 27 Jul 2010 09:34:59 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@router.home To: Minchan Kim cc: KAMEZAWA Hiroyuki , Milton Miller , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Russell King , Mel Gorman , Johannes Weiner , Kukjin Kim Subject: Re: [PATCH] Tight check of pfn_valid on sparsemem - v4 In-Reply-To: Message-ID: References: <1280159163-23386-1-git-send-email-minchan.kim@gmail.com> <20100727171351.98d5fb60.kamezawa.hiroyu@jp.fujitsu.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 552 Lines: 15 On Tue, 27 Jul 2010, Minchan Kim wrote: > But in fact I have a concern to use PG_reserved since it can be used > afterward pfn_valid normally to check hole in non-hole system. So I > think it's redundant. PG_reserved is already used to mark pages not handled by the page allocator (see mmap_init_zone). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/