linux-kernel - Re: Enhancing semantics with memremap()

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Message-ID: <20160531172705.GJ11948@wotan.suse.de>
Date:	Tue, 31 May 2016 19:27:05 +0200
From:	"Luis R. Rodriguez" <mcgrof@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Toshi Kani <toshi.kani@...com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Julia Lawall <julia.lawall@...6.fr>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: Enhancing semantics with memremap() - aliasing with memremap()

On Tue, May 31, 2016 at 07:25:14PM +0200, Luis R. Rodriguez wrote:
> On Tue, May 31, 2016 at 09:58:28AM -0700, Christoph Hellwig wrote:
> > On Tue, May 24, 2016 at 04:36:42PM -0700, Luis R. Rodriguez wrote:
> > > Is it a good time for that now? I would hope identifying proper
> > > aliasing uses for memremap() might be a bit easier now than for
> > > ioremap() given its not used as widely. It may be an easier target to
> > > also write some grammar rules for it as well.
> > 
> > So you want an explicit opt-in flag to allow aliasing?  Sounds fine to
> > me.
>   
> Yup! Can the default then safely already be no-aliasing then?

Or if aliasing is truly not needed as often a different API, this
maybe useful later if we pick up again module namespace stuff.

  Luis