From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758479AbYC0EFQ (ORCPT ); Thu, 27 Mar 2008 00:05:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750817AbYC0EFF (ORCPT ); Thu, 27 Mar 2008 00:05:05 -0400 Received: from relay2.sgi.com ([192.48.171.30]:52693 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750701AbYC0EFE (ORCPT ); Thu, 27 Mar 2008 00:05:04 -0400 Date: Wed, 26 Mar 2008 21:03:04 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: Ingo Molnar cc: linux-kernel@vger.kernel.org, Jeremy Fitzhardinge Subject: [x86] Stricter check in follow_huge_addr() Message-ID: 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 From: Christoph Lameter Subject: Compound Pages: Stricter check in follow_huge_addr The first page of the compound page is determined in follow_huge_addr() but then PageCompound() only checks if the page is part of a compound page. PageHead() allows checking if this is indeed the first page of the compound. Cc: Jeremy Fitzhardinge Cc: Thomas Gleixner Signed-off-by: Christoph Lameter --- arch/x86/mm/hugetlbpage.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.25-rc5-mm1/arch/x86/mm/hugetlbpage.c =================================================================== --- linux-2.6.25-rc5-mm1.orig/arch/x86/mm/hugetlbpage.c 2008-03-26 20:43:56.796667401 -0700 +++ linux-2.6.25-rc5-mm1/arch/x86/mm/hugetlbpage.c 2008-03-26 20:44:55.526669888 -0700 @@ -178,7 +178,7 @@ follow_huge_addr(struct mm_struct *mm, u page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; - WARN_ON(!PageCompound(page)); + WARN_ON(!PageHead(page)); return page; }