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

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Message-ID: <20150729065004.GA17162@lst.de>
Date:	Wed, 29 Jul 2015 08:50:04 +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 Mon, Jul 27, 2015 at 04:26:03PM -0700, Dan Williams wrote:
> Oh, because all we have at this point is ioremap_cache() which
> silently falls back.  It's not until the introduction of
> arch_memremp() where we update the arch code to break that behavior.

Ok, makes sense.  Might be worth to document in the changelog.

> That said, I think it may be beneficial to allow a fallback if the
> user cares.  So maybe memremap() can call plain ioremap() if
> MEMREMAP_STRICT is not set and none of the other mapping types are
> satisfied.

Is there a real use case for it?  Fallback APIs always seem confusing
and it might make more sense to do this in the caller(s) that actually
need it.
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