linux-kernel - Re: [PATCH 01/17] x86: Make page cache mode a real type

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Message-ID: <20141031194207.GA15367@pd.tnic>
Date:	Fri, 31 Oct 2014 20:42:07 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Juergen Gross <jgross@...e.com>
Cc:	hpa@...or.com, x86@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, stefan.bader@...onical.com,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, ville.syrjala@...ux.intel.com,
	david.vrabel@...rix.com, jbeulich@...e.com, toshi.kani@...com,
	plagnioj@...osoft.com, tomi.valkeinen@...com, bhelgaas@...gle.com
Subject: Re: [PATCH 01/17] x86: Make page cache mode a real type

On Fri, Oct 31, 2014 at 03:00:17PM +0100, Juergen Gross wrote:
> At the moment there are a lot of places that handle setting or getting
> the page cache mode by treating the pgprot bits equal to the cache mode.
> This is only true because there are a lot of assumptions about the setup
> of the PAT MSR. Otherwise the cache type needs to get translated into
> pgprot bits and vice versa.
> 
> This patch tries to prepare for that by introducing a separate type
> for the cache mode and adding functions to translate between those and
> pgprot values.
> 
> To avoid too much performance penalty the translation between cache mode
> and pgprot values is done via tables which contain the relevant
> information.  Write-back cache mode is hard-wired to be 0, all other
> modes are configurable via those tables. For large pages there are
> translation functions as the PAT bit is located at different positions
> in the ptes of 4k and large pages.
> 
> Signed-off-by: Stefan Bader <stefan.bader@...onical.com>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Just a clarification question: how is one to understand this attribution
here? Is Stefan the original author, was he a reviewer, or? Because this
SOB chain is misleading...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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