linux-kernel - Re: [PATCH v1 02/47] x86: mtrr: generalize run time disabling of MTRR

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Date:	Thu, 2 Apr 2015 15:13:26 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, 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@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	Ingo Molnar <mingo@...e.hu>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Toshi Kani <toshi.kani@...com>,
	Roger Pau Monné <roger.pau@...rix.com>,
	xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH v1 02/47] x86: mtrr: generalize run time disabling of MTRR

On Thu, Mar 26, 2015 at 6:35 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:

> I'll rephrase this to:
>
> ---
> It is possible to enable CONFIG_MTRR and up with it
> disabled at run time and yet CONFIG_X86_PAT continues
> to kick through with all functionally enabled. This
> can happen for instance on Xen where MTRR is not
> supported but PAT is, this can happen now on Linux as
> of commit 47591df50 by Juergen introduced as of v3.19.

I still can't parse this.  What does "up with it disabled at run time"
mean?  And "... continues to kick through"?  Probably some idiomatic
usage I'm just too old to understand :)

Please use the conventional citation format:

  47591df50512 ("xen: Support Xen pv-domains using PAT")

A one-character typo in a SHA1 makes it completely useless, so it's
nice to have the summary line both for readability and a bit of
redundancy.

Bjorn
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