Date: Tue, 21 Apr 2015 23:39:39 -0600
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: "Luis R. Rodriguez" <mcgrof@suse.com>
Cc: Andy Lutomirski <luto@amacapital.net>, mike.marciniszyn@intel.com,
        infinipath@intel.com, linux-rdma@vger.kernel.org,
        awalls@md.metrocast.net, Toshi Kani <toshi.kani@hp.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Hal Rosenstock <hal.rosenstock@gmail.com>,
        Sean Hefty <sean.hefty@intel.com>, Suresh Siddha <sbsiddha@gmail.com>,
        Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>,
        Roland Dreier <roland@purestorage.com>,
        Juergen Gross <jgross@suse.com>,
        Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
        Borislav Petkov <bp@suse.de>, Mel Gorman <mgorman@suse.de>,
        Vlastimil Babka <vbabka@suse.cz>, Davidlohr Bueso <dbueso@suse.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ville Syrj?l? <syrjala@sci.fi>,
        Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
        linux-media@vger.kernel.org, X86 ML <x86@kernel.org>,
        mcgrof@do-not-panic.com
Subject: Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR
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On Wed, Apr 22, 2015 at 01:39:07AM +0200, Luis R. Rodriguez wrote:
> > Mike, do you think the time is right to just remove the iPath driver?
> 
> With PAT now being default the driver effectively won't work
> with write-combining on modern kernels. Even if systems are old
> they likely had PAT support, when upgrading kernels PAT will work
> but write-combing won't on ipath.

Sorry, do you mean the driver already doesn't get WC? Or do you mean
after some more pending patches are applied?

Jason
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