linux-kernel - Re: [PATCH v4 4/5] cramfs: add mmap support

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

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.