linux-kernel - RE: [PATCH v4 4/7] x86, mm, pat: Add pgprot

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Date:	Tue, 4 Nov 2014 03:34:35 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	"Kani, Toshimitsu" <toshi.kani@...com>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jgross@...e.com" <jgross@...e.com>,
	"stefan.bader@...onical.com" <stefan.bader@...onical.com>,
	"hmh@....eng.br" <hmh@....eng.br>,
	"yigal@...xistor.com" <yigal@...xistor.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
Subject: RE: [PATCH v4 4/7] x86, mm, pat: Add pgprot_writethrough() for WT



> -----Original Message-----
> From: Andy Lutomirski [mailto:luto@...capital.net]
> Sent: Monday, November 03, 2014 5:01 PM
> To: Thomas Gleixner
> Cc: Kani, Toshimitsu; Elliott, Robert (Server Storage); hpa@...or.com;
> mingo@...hat.com; akpm@...ux-foundation.org; arnd@...db.de; linux-
> mm@...ck.org; linux-kernel@...r.kernel.org; jgross@...e.com;
> stefan.bader@...onical.com; hmh@....eng.br; yigal@...xistor.com;
> konrad.wilk@...cle.com
> Subject: Re: [PATCH v4 4/7] x86, mm, pat: Add pgprot_writethrough() for
> WT
> 
> On Mon, Nov 3, 2014 at 2:53 PM, Thomas Gleixner <tglx@...utronix.de>
> wrote:
...
> On the other hand, I thought that _GPL was supposed to be more about
> whether the thing using it is inherently a derived work of the Linux
> kernel.  Since WT is an Intel concept, not a Linux concept, then I
> think that this is a hard argument to make.

IBM System/360 Model 85 (1968) had write-through (i.e., store-through)
caching.  Intel might claim Write Combining, though.