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Date: Tue, 2 Oct 2018 07:52:06 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps
Message-ID: <20181002145206.GA10903@infradead.org>
References: <20181002100531.GC4135@quack2.suse.cz>
 <20181002121039.GA3274@linux-x5ow.site>
 <20181002142959.GD9127@quack2.suse.cz>
 <20181002143713.GA19845@infradead.org>
 <20181002144412.GC4963@linux-x5ow.site>
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To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Christoph Hellwig <hch@infradead.org>, Jan Kara <jack@suse.cz>, Dan Williams <dan.j.williams@intel.com>, Dave Jiang <dave.jiang@intel.com>, 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

On Tue, Oct 02, 2018 at 04:44:13PM +0200, Johannes Thumshirn wrote:
> 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.

So what exacty is that "DAX" they are querying about (and no, I'm not
joking, nor being philosophical).