From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753841AbdGJLcW (ORCPT ); Mon, 10 Jul 2017 07:32:22 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:38286 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753790AbdGJLcV (ORCPT ); Mon, 10 Jul 2017 07:32:21 -0400 From: Anshuman Khandual To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, mike.kravetz@oracle.com Subject: [PATCH] mm/mremap: Document MREMAP_FIXED dependency on MREMAP_MAYMOVE Date: Mon, 10 Jul 2017 17:02:11 +0530 X-Mailer: git-send-email 2.9.3 X-TM-AS-MML: disable x-cbid: 17071011-0004-0000-0000-00000225EFBA X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17071011-0005-0000-0000-00005E0A4BC8 Message-Id: <20170710113211.31394-1-khandual@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-10_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=3 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1707100205 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the header file, just specify the dependency of MREMAP_FIXED on MREMAP_MAYMOVE and make it explicit for the user space. Signed-off-by: Anshuman Khandual --- include/uapi/linux/mman.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h index ade4acd..8cae3f6 100644 --- a/include/uapi/linux/mman.h +++ b/include/uapi/linux/mman.h @@ -3,8 +3,10 @@ #include -#define MREMAP_MAYMOVE 1 -#define MREMAP_FIXED 2 +#define MREMAP_MAYMOVE 1 /* VMA can move after remap and resize */ +#define MREMAP_FIXED 2 /* VMA can remap at particular address */ + +/* NOTE: MREMAP_FIXED must be set with MREMAP_MAYMOVE, not alone */ #define OVERCOMMIT_GUESS 0 #define OVERCOMMIT_ALWAYS 1 -- 1.8.5.2