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From: "Luis R. Rodriguez" <mcgrof@suse.com>
Date: Wed, 29 Apr 2015 12:50:40 -0700
Message-ID: <CAB=NE6V8bVPofvcaGhUebqZckvEAvbYrSdv1EJU52M-4vrFQ8g@mail.gmail.com>
Subject: Re: [PATCH v3] fusion: remove dead MTRR code
To: Nagalakshmi Nandigama <nagalakshmi.nandigama@avagotech.com>,
        Praveen Krishnamoorthy <praveen.krishnamoorthy@avagotech.com>,
        Sreekanth Reddy <sreekanth.reddy@avagotech.com>,
        Abhijit Mahajan <abhijit.mahajan@avagotech.com>,
        "mpt-fusionlinux.pdl" <MPT-FusionLinux.pdl@avagotech.com>,
        Linux SCSI List <linux-scsi@vger.kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        "Luis R. Rodriguez" <mcgrof@suse.com>, Toshi Kani <toshi.kani@hp.com>,
        Christoph Hellwig <hch@infradead.org>,
        Suresh Siddha <sbsiddha@gmail.com>, Ingo Molnar <mingo@elte.hu>,
        Thomas Gleixner <tglx@linutronix.de>, Juergen Gross <jgross@suse.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Dave Airlie <airlied@redhat.com>, Antonino Daplas <adaplas@gmail.com>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <syrjala@sci.fi>,
        Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
        Borislav Petkov <bp@suse.de>, Davidlohr Bueso <dbueso@suse.de>,
        Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Tue, Apr 21, 2015 at 1:46 PM, Luis R. Rodriguez
<mcgrof@do-not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcgrof@suse.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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