linux-kernel - Re: [PATCH v3] fusion: remove dead MTRR code

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Message-ID: <CAB=NE6V8bVPofvcaGhUebqZckvEAvbYrSdv1EJU52M-4vrFQ8g@mail.gmail.com>
Date:	Wed, 29 Apr 2015 12:50:40 -0700
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	"mpt-fusionlinux.pdl" <MPT-FusionLinux.pdl@...gotech.com>,
	Linux SCSI List <linux-scsi@...r.kernel.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Toshi Kani <toshi.kani@...com>,
	Christoph Hellwig <hch@...radead.org>,
	Suresh Siddha <sbsiddha@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juergen Gross <jgross@...e.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Antonino Daplas <adaplas@...il.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Ville Syrjälä <syrjala@....fi>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Borislav Petkov <bp@...e.de>, Davidlohr Bueso <dbueso@...e.de>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] fusion: remove dead MTRR code

On Tue, Apr 21, 2015 at 1:46 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> If and when this gets enabled the driver could should split
> up IO memory space properly and that is quite a bit of work.
> Just remove the uncommented dead MTRR code then.
>
> There are a few motivations for this:
>
> a) Take advantage of PAT when available
>
> b) Help bury MTRR code away, MTRR is architecture specific and on
>    x86 its replaced by PAT
>
> c) Help with the goal of eventually using _PAGE_CACHE_UC over
>    _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (see commit
>    de33c442e titled "x86 PAT: fix performance drop for glx,
>    use UC minus for ioremap(), ioremap_nocache() and
>    pci_mmap_page_range()")

Hey folks, who's tree should this go through if agreeable?

 Luis
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