linux-kernel - Re: [PATCH] mm: make ioremap

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Message-ID: <20101124084836.GH2212@linux-sh.org>
Date:	Wed, 24 Nov 2010 17:48:36 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Chris Metcalf <cmetcalf@...era.com>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: make ioremap_prot() take a pgprot.

On Tue, Nov 09, 2010 at 01:18:19AM +1100, Benjamin Herrenschmidt wrote:
> On Mon, 2010-11-08 at 15:34 +0900, Paul Mundt wrote:
> > On Wed, Nov 03, 2010 at 05:31:03AM +0900, Paul Mundt wrote:
> > > The current definition of ioremap_prot() takes an unsigned long for the
> > > page flags and then converts to/from a pgprot as necessary. This is
> > > unfortunately not sufficient for the SH-X2 TLB case which has a 64-bit
> > > pgprot and a 32-bit unsigned long.
> > > 
> > > An inspection of the tree shows that tile and cris also have their
> > > own equivalent routines that are using the pgprot_t but do not set
> > > HAVE_IOREMAP_PROT, both of which could trivially be adapted.
> > > 
> > > After cris/tile are updated there would also be enough critical mass to
> > > move the powerpc devm_ioremap_prot() in to the generic lib/devres.c.
> > > 
> > > Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
> > > 
> > Any takers?
> 
> Haven't had a chance to play with it yet, still travelling.
> 
Ping.
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