linux-kernel - Re: [PATCH v4 2/6] x86: document WC MTRR effects on PAT / non-PAT pages

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Date:	Tue, 5 May 2015 09:35:16 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, bp@...e.de,
	plagnioj@...osoft.com, tomi.valkeinen@...com,
	daniel.vetter@...el.com, airlied@...ux.ie, dledford@...hat.com,
	awalls@...metrocast.net, syrjala@....fi, luto@...capital.net,
	mst@...hat.com, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@...com>,
	Jonathan Corbet <corbet@....net>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Juergen Gross <jgross@...e.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Antonino Daplas <adaplas@...il.com>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Davidlohr Bueso <dbueso@...e.de>, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v4 2/6] x86: document WC MTRR effects on PAT / non-PAT
 pages

On Mon, May 04, 2015 at 02:23:03PM +0200, Borislav Petkov wrote:
> On Wed, Apr 29, 2015 at 02:44:07PM -0700, Luis R. Rodriguez wrote:
> > From: "Luis R. Rodriguez" <mcgrof@...e.com>
> > 
> > As part of the effort to phase out MTRR use document
> > write-combining MTRR effects on pages with different
> > non-PAT page attributes flags and different PAT entry
> > values. Extend arch_phys_wc_add() documentation to
> > clarify power of two sizes / boundary requirements as
> > we phase out mtrr_add() use.
> > 
> > Lastly hint towards ioremap_uc() for corner cases on
> > device drivers working with devices with mixed regions
> > where MTRR size requirements would otherwise not
> > enable write-combining effective memory types.
> > 
> > Cc: Toshi Kani <toshi.kani@...com>
> > Cc: Jonathan Corbet <corbet@....net>
> > Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> > Cc: Andy Lutomirski <luto@...capital.net>
> > Cc: Suresh Siddha <sbsiddha@...il.com>
> > Cc: Ingo Molnar <mingo@...e.hu>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Juergen Gross <jgross@...e.com>
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > Cc: Dave Airlie <airlied@...hat.com>
> > Cc: Antonino Daplas <adaplas@...il.com>
> > Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
> > Cc: Tomi Valkeinen <tomi.valkeinen@...com>
> > Cc: Ville Syrjälä <syrjala@....fi>
> > Cc: Mel Gorman <mgorman@...e.de>
> > Cc: Vlastimil Babka <vbabka@...e.cz>
> > Cc: Borislav Petkov <bp@...e.de>
> > Cc: Davidlohr Bueso <dbueso@...e.de>
> > Cc: linux-fbdev@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
> > ---
> >  Documentation/x86/mtrr.txt      | 18 +++++++++++++++---
> >  Documentation/x86/pat.txt       | 40 +++++++++++++++++++++++++++++++++++++++-
> >  arch/x86/kernel/cpu/mtrr/main.c |  3 +++
> >  3 files changed, 57 insertions(+), 4 deletions(-)
> > 
> > diff --git a/Documentation/x86/mtrr.txt b/Documentation/x86/mtrr.txt
> > index cc071dc..a111a6c 100644
> > --- a/Documentation/x86/mtrr.txt
> > +++ b/Documentation/x86/mtrr.txt
> > @@ -1,7 +1,19 @@
> >  MTRR (Memory Type Range Register) control
> > -3 Jun 1999
> > -Richard Gooch
> > -<rgooch@...f.csiro.au>
> > +
> > +Richard Gooch <rgooch@...f.csiro.au> - 3 Jun 1999
> > +Luis R. Rodriguez <mcgrof@...not-panic.com> - April 9, 2015
> > +
> > +===============================================================================
> > +Phasing MTRR use
> 
> "Phasing out...".

Fixed all, will send another version.

  Luis
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