RE: [PATCH v4 4/7] x86, mm, pat: Add pgprot_writethrough() for WT

[Elliott, Robert (Server Storage)]

> -----Original Message-----
> From: Andy Lutomirski [mailto:luto@xxxxxxxxxxxxxx]
> Sent: Monday, November 03, 2014 5:01 PM
> To: Thomas Gleixner
> Cc: Kani, Toshimitsu; Elliott, Robert (Server Storage); hpa@xxxxxxxxx;
> mingo@xxxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx; arnd@xxxxxxxx; linux-
> mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; jgross@xxxxxxxx;
> stefan.bader@xxxxxxxxxxxxx; hmh@xxxxxxxxxx; yigal@xxxxxxxxxxxxx;
> konrad.wilk@xxxxxxxxxx
> 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@xxxxxxxxxxxxx>
> 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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