linux-kernel - Re: [PATCH v1 00/47] mtrr/x86/drivers: bury MTRR

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Date:	Fri, 20 Mar 2015 18:08:39 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Juergen Gross <jgross@...e.com>,
	Jan Beulich <JBeulich@...e.com>, Borislav Petkov <bp@...e.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	venkatesh.pallipadi@...el.com, Dave Airlie <airlied@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	X86 ML <x86@...nel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [PATCH v1 00/47] mtrr/x86/drivers: bury MTRR

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> When a system has PAT support enabled you don't need to be
> using MTRRs. Andy had added arch_phys_wc_add() long ago to
> help with this but not all drivers were converted over. We
> have to take care to only convert drivers where we know that
> the proper ioremap_wc() API has been used. Doing this requires
> a bit of work on verifying the driver split out the ioremap'd
> areas -- and if not doing that ourselves. Verifying a driver
> uses the same areas can be hard but with a bit of love Coccinelle
> can help with that.
>
> We're motivated to change drivers for a few reasons:
>
> 1) Take advantage of PAT when available
>
> 2) Help with the goal of eventually using _PAGE_CACHE_UC over
>    _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

Nice!

--Andy
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