Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752015AbaDCLvf (ORCPT ); Thu, 3 Apr 2014 07:51:35 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:41987 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751928AbaDCLvc (ORCPT ); Thu, 3 Apr 2014 07:51:32 -0400 Message-ID: <533D4B42.4040600@codeaurora.org> Date: Thu, 03 Apr 2014 07:51:30 -0400 From: Christopher Covington User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: mtk.manpages@gmail.com CC: Richard Hansen , Steven Whitehouse , Christoph Hellwig , "linux-mm@kvack.org" , lkml , Linux API , Greg Troxel , Peter Zijlstra Subject: Re: [PATCH] mm: msync: require either MS_ASYNC or MS_SYNC References: <533B04A9.6090405@bbn.com> <20140402111032.GA27551@infradead.org> <1396439119.2726.29.camel@menhir> <533CA0F6.2070100@bbn.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/03/2014 04:25 AM, Michael Kerrisk (man-pages) wrote: > I think the only reasonable solution is to better document existing > behavior and what the programmer should do. With that in mind, I've > drafted the following text for the msync(2) man page: > > NOTES > According to POSIX, exactly one of MS_SYNC and MS_ASYNC must be > specified in flags. However, Linux permits a call to msync() > that specifies neither of these flags, with semantics that are > (currently) equivalent to specifying MS_ASYNC. (Since Linux > 2.6.19, MS_ASYNC is in fact a no-op, since the kernel properly > tracks dirty pages and flushes them to storage as necessary.) > Notwithstanding the Linux behavior, portable, future-proof appli‐ > cations should ensure that they specify exactly one of MS_SYNC > and MS_ASYNC in flags. Nit: MS_SYNC or MS_ASYNC Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation. -- 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/