linux-kernel - Re: [PATCH v11 2/12] x86, mm, pat: Refactor !pat

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Message-ID: <1433173815.23540.110.camel@misato.fc.hp.com>
Date:	Mon, 01 Jun 2015 09:50:15 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, arnd@...db.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-nvdimm@...ts.01.org, jgross@...e.com,
	stefan.bader@...onical.com, luto@...capital.net, hmh@....eng.br,
	yigal@...xistor.com, konrad.wilk@...cle.com, Elliott@...com,
	mcgrof@...e.com, hch@....de
Subject: Re: [PATCH v11 2/12] x86, mm, pat: Refactor !pat_enabled handling

On Sun, 2015-05-31 at 11:46 +0200, Borislav Petkov wrote:
> On Fri, May 29, 2015 at 04:59:00PM -0600, Toshi Kani wrote:
> > From: Toshi Kani <toshi.kani@...com>
> > 
> > This patch refactors the !pat_enabled code paths and integrates
> > them into the PAT abstraction code.  The PAT table is emulated by
> > corresponding to the two cache attribute bits, PWT (Write Through)
> > and PCD (Cache Disable).  The emulated PAT table is the same as the
> > BIOS default setup when the system has PAT but the "nopat" boot
> > option is specified.  The emulated PAT table is also used when
> > MSR_IA32_CR_PAT returns 0 -- 9d34cfdf4796 ("x86: Don't rely on
> > VMWare emulating PAT MSR correctly").
> 
> To be honest, I wasn't surprised when you sent me the same patch and
> ignored most of my comments. For the future, please let me know if I'm
> wasting my time with commenting on your stuff so that I can plan my work
> and not waste time and energy reviewing, ok?

I apologize that I overlooked a comment requesting to divide this
refactor patch into smaller patches.

> Unfortunately, if you want something done right, you have to do it
> yourself.
>
> So I did that, I split that ugly cleanup into something much more
> readable, patches as a reply to this message.
> 
> Feel free to base your work ontop of
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git#tip-mm-2
> 

I will look into your changes, and rebase the patchset.

Thanks,
-Toshi

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