Return-Path: Received: from mx2.suse.de ([195.135.220.15]:60490 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727856AbeJBV2C (ORCPT ); Tue, 2 Oct 2018 17:28:02 -0400 Date: Tue, 2 Oct 2018 16:44:13 +0200 From: Johannes Thumshirn To: Christoph Hellwig Cc: Jan Kara , Dan Williams , Dave Jiang , linux-nvdimm@lists.01.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-api@vger.kernel.org Subject: Re: Problems with VM_MIXEDMAP removal from /proc//smaps Message-ID: <20181002144412.GC4963@linux-x5ow.site> References: <20181002100531.GC4135@quack2.suse.cz> <20181002121039.GA3274@linux-x5ow.site> <20181002142959.GD9127@quack2.suse.cz> <20181002143713.GA19845@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20181002143713.GA19845@infradead.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Tue, Oct 02, 2018 at 07:37:13AM -0700, Christoph Hellwig wrote: > No, it should not. DAX is an implementation detail thay may change > or go away at any time. Well we had an issue with an application checking for dax, this is how we landed here in the first place. It's not that I want them to do it, it's more that they're actually doing it in all kinds of interesting ways and then complaining when it doesn't work anymore. So it's less of an "API beauty price problem" but more of a "provide a documented way which we won't break" way. Byte, Johannes -- Johannes Thumshirn Storage jthumshirn@suse.de +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg GF: Felix Imend?rffer, Jane Smithard, Graham Norton HRB 21284 (AG N?rnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850