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

From: Bjorn Helgaas
Date: Thu Apr 02 2015 - 16:13:53 EST

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

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