linux-kernel - Re: ioremap_uc() followed by set_memory_wc()

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Message-ID: <20150422053939.GA29609@obsidianresearch.com>
Date:	Tue, 21 Apr 2015 23:39:39 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	Andy Lutomirski <luto@...capital.net>, mike.marciniszyn@...el.com,
	infinipath@...el.com, linux-rdma@...r.kernel.org,
	awalls@...metrocast.net, Toshi Kani <toshi.kani@...com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Roland Dreier <roland@...estorage.com>,
	Juergen Gross <jgross@...e.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Borislav Petkov <bp@...e.de>, Mel Gorman <mgorman@...e.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	Davidlohr Bueso <dbueso@...e.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ville Syrj?l? <syrjala@....fi>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	linux-media@...r.kernel.org, X86 ML <x86@...nel.org>,
	mcgrof@...not-panic.com
Subject: Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR

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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