linux-kernel - Re: [PATCH] x86, pat: Add comments to cachemode translation tables

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Message-ID: <1437665929.3214.313.camel@hp.com>
Date:	Thu, 23 Jul 2015 09:38:49 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	peterz@...radead.org, mingo@...nel.org, x86@...nel.org,
	tglx@...utronix.de, bp@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, pat: Add comments to cachemode translation tables

On Thu, 2015-07-23 at 09:36 -0600, Jan Beulich wrote:
> > 
> > > > On 23.07.15 at 17:25, <toshi.kani@...com> wrote:
> > Yes, I agree with you.  But such risk is very low -- 1) the regular 
> > case
> > (no fallback) is used most of the cases, 2) the code using WT knows 
> > what
> > type of memory it is dealing with.  For example, pmem may map NVDIMM 
> > with
> > WT, and any sane BIOS sets MTRR to WB for NVDIMM. 
> 
> Do the words "sane" and "BIOS" really fit together in your opinion?

:-)

Anyway, I am not disagreeing with you... When UC is ready for both regular
memory and IO memory, it should be changed to fall back to UC.

Thanks,
-Toshi
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