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

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Message-ID: <20150729215230.GL30479@wotan.suse.de>
Date:	Wed, 29 Jul 2015 23:52:30 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Toshi Kani <toshi.kani@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-arch@...r.kernel.org, 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>,
	Christoph Hellwig <hch@....de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 08/25] arch: introduce memremap()

On Wed, Jul 29, 2015 at 02:47:40PM -0700, Dan Williams wrote:
> On Wed, Jul 29, 2015 at 2:43 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> > While at it, Dan, will / should memremap() support overlapping calls ?
> > What is the expectation on behaviour ?
> 
> It will be the same as ioremap().  Each mapping gets its own virtual
> address and overlapping calls are permitted.  The only protection is
> that RAM is never mapped with an alias.

If you could document this as part of your next respin that'd be
highly appreciated.

  Luis
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