Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR

From: Doug Ledford <dledford@redhat.com>
To: "Luis R. Rodriguez" <mcgrof@suse.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
	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
Date: Wed, 22 Apr 2015 15:10:41 -0400	[thread overview]
Message-ID: <1429729841.121496.15.camel@redhat.com> (raw)
In-Reply-To: <20150422190520.GL5622@wotan.suse.de>

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On Wed, 2015-04-22 at 21:05 +0200, Luis R. Rodriguez wrote:

> > > I'd also love to remove the driver if it turns out there are actually
> > > no users. qib substantially replaces it except for a few very old
> > > cards.
> > 
> > To be precise, the split is that ipath powers the old HTX bus cards that
> > only work in AMD systems,
> 
> Do those systems have PAT support? CAn anyone check if PAT is enabled
> if booted on a recent kernel?

I don't have one of these systems any more.  The *only* one I ever had
was a monster IBM box...I can't even find a reference to it any more.

-- 
Doug Ledford <dledford@redhat.com>
              GPG KeyID: 0E572FDD

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