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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v4 4/5] cramfs: add mmap support
Date: Wed, 4 Oct 2017 00:25:53 -0700
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To: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Christoph Hellwig <hch@infradead.org>, Richard Weinberger <richard.weinberger@gmail.com>, Alexander Viro <viro@zeniv.linux.org.uk>, "linux-mm@kvack.org" <linux-mm@kvack.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, "linux-embedded@vger.kernel.org" <linux-embedded@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, Chris Brandt <Chris.Brandt@renesas.com>

On Tue, Oct 03, 2017 at 11:40:28AM -0400, Nicolas Pitre wrote:
> I provided that explanation several times by now in my cover letter. And 
> separately even to you directly at least once.  What else should I do?

You should do the right things instead of stating irrelevant things
in your cover letter.  As said in my last mail: look at the VM_MIXEDMAP
flag and how it is used by DAX, and you'll get out of the vma splitting
business in the fault path.

If the fs/dax.c code scares you take a look at drivers/dax/device.c
instead.