From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id 563846B007E for ; Wed, 9 Sep 2009 05:17:06 -0400 (EDT) Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234]) by e9.ny.us.ibm.com (8.14.3/8.13.1) with ESMTP id n899Exbx006045 for ; Wed, 9 Sep 2009 05:14:59 -0400 Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay02.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id n899H5OV247044 for ; Wed, 9 Sep 2009 05:17:05 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n899Dxw6020612 for ; Wed, 9 Sep 2009 05:13:59 -0400 From: Eric B Munson Subject: [PATCH] MAP_HUGETLB value collision fix Date: Wed, 9 Sep 2009 10:16:51 +0100 Message-Id: <1252487811-9205-1-git-send-email-ebmunson@us.ibm.com> References: <1c66a9e98a73d61c611e5cf09b276e954965046e.1251282769.git.ebmunson@us.ibm.com> <1721a3e8bdf8f311d2388951ec65a24d37b513b1.1251282769.git.ebmunson@us.ibm.com> Sender: owner-linux-mm@kvack.org To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-man@vger.kernel.org, mtk.manpages@gmail.com, randy.dunlap@oracle.com, hugh.dickins@tiscali.co.uk, Eric B Munson List-ID: The patch hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch used the value 0x40 for MAP_HUGETLB which is the same value used for various other flags on some architectures. This collision causes unexpected use of huge pages in the best case and mmap to fail with ENOMEM or ENOSYS in the worst. This patch changes the value for MAP_HUGETLB to a value that is not currently used on any arch. This patch should be considered a fix to hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch. Reported-by: Hugh Dickins Signed-off-by: Eric B Munson --- include/asm-generic/mman-common.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/asm-generic/mman-common.h b/include/asm-generic/mman-common.h index 12f5982..e6adb68 100644 --- a/include/asm-generic/mman-common.h +++ b/include/asm-generic/mman-common.h @@ -19,7 +19,7 @@ #define MAP_TYPE 0x0f /* Mask for type of mapping */ #define MAP_FIXED 0x10 /* Interpret addr exactly */ #define MAP_ANONYMOUS 0x20 /* don't use a file */ -#define MAP_HUGETLB 0x40 /* create a huge page mapping */ +#define MAP_HUGETLB 0x080000 /* create a huge page mapping */ #define MS_ASYNC 1 /* sync memory asynchronously */ #define MS_INVALIDATE 2 /* invalidate the caches */ -- 1.6.3.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org