From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Date: Wed, 22 Apr 2015 05:39:39 +0000 Subject: Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR Message-Id: <20150422053939.GA29609@obsidianresearch.com> List-Id: References: <20150421224601.GY5622@wotan.suse.de> <20150421225732.GA17356@obsidianresearch.com> <20150421233907.GA5622@wotan.suse.de> In-Reply-To: <20150421233907.GA5622@wotan.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Luis R. Rodriguez" Cc: Andy Lutomirski , mike.marciniszyn@intel.com, infinipath@intel.com, linux-rdma@vger.kernel.org, awalls@md.metrocast.net, Toshi Kani , "H. Peter Anvin" , Ingo Molnar , "linux-kernel@vger.kernel.org" , Hal Rosenstock , Sean Hefty , Suresh Siddha , Rickard Strandqvist , Roland Dreier , Juergen Gross , Mauro Carvalho Chehab , Borislav Petkov , Mel Gorman , Vlastimil Babka , Davidlohr Bueso , Dave Hansen , Jean-Christophe Plagniol-Villard , Thomas Gleixner , Ville Syrj?l? , Linux Fbdev development list , linux-media@vger.kernel.org, X86 ML , mcgrof@do-not-panic.com 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