From: "Elliott, Robert (Server Storage)" <Elliott@hp.com>
To: Andy Lutomirski <luto@amacapital.net>,
        Thomas Gleixner <tglx@linutronix.de>
CC: "Kani, Toshimitsu" <toshi.kani@hp.com>, "hpa@zytor.com" <hpa@zytor.com>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "arnd@arndb.de" <arnd@arndb.de>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "jgross@suse.com" <jgross@suse.com>,
        "stefan.bader@canonical.com" <stefan.bader@canonical.com>,
        "hmh@hmh.eng.br" <hmh@hmh.eng.br>,
        "yigal@plexistor.com" <yigal@plexistor.com>,
        "konrad.wilk@oracle.com" <konrad.wilk@oracle.com>
Subject: RE: [PATCH v4 4/7] x86, mm, pat: Add pgprot_writethrough() for WT
Thread-Topic: [PATCH v4 4/7] x86, mm, pat: Add pgprot_writethrough() for WT
Thread-Index: AQHP8juoXLRxtX3zhkeUJSzf2kRDYZxPgA5QgAACt4CAAArfgIAAAfYAgABFedA=
Date: Tue, 4 Nov 2014 03:34:35 +0000
Message-ID: <94D0CD8314A33A4D9D801C0FE68B40295936556E@G4W3202.americas.hpqcorp.net>
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> -----Original Message-----
> From: Andy Lutomirski [mailto:luto@amacapital.net]
> Sent: Monday, November 03, 2014 5:01 PM
> To: Thomas Gleixner
> Cc: Kani, Toshimitsu; Elliott, Robert (Server Storage); hpa@zytor.com;
> mingo@redhat.com; akpm@linux-foundation.org; arnd@arndb.de; linux-
> mm@kvack.org; linux-kernel@vger.kernel.org; jgross@suse.com;
> stefan.bader@canonical.com; hmh@hmh.eng.br; yigal@plexistor.com;
> konrad.wilk@oracle.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@linutronix.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.


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