linux-kernel - Re: [PATCH v2 08/25] arch: introduce memremap()

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Message-ID: <20150727051258.GB15836@lst.de>
Date:	Mon, 27 Jul 2015 07:12:58 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 08/25] arch: introduce memremap()

On Sun, Jul 26, 2015 at 10:49:39AM -0700, Dan Williams wrote:
> On Sun, Jul 26, 2015 at 10:25 AM, Christoph Hellwig <hch@....de> wrote:
> > On Fri, Jul 24, 2015 at 10:38:42PM -0400, Dan Williams wrote:
> >> The behavior change to return NULL on an unsupported request is reserved
> >> for a later patch.
> >
> > Why?
> 
> This is for drivers like pmem that care about the mapping type.  For
> example, if pmem can't get a cache-enabled mapping it is potentially
> putting the write durability of the persistent media at risk.

I understand that part, but the question is why the old behavior
is retained for now and only changed later.
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