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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] ipv6: fix a potential use after free in sit.c
Date: Sat, 18 Oct 2014 13:36:05 -0400 (EDT)
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From: Dave Taht <dave.taht@gmail.com>
Date: Sat, 18 Oct 2014 10:22:35 -0700

> So far as I know, the one machine linux has never been ported
> to was a LISP machine. With its 36 bit words, and tagging, that
> would do what you want. I had kind of hoped with 64 bits of
> addressing some of those ideas would have been reused.
> 
> /me misses truly oddball architectures

Sparc cpus have tagged add and subtract instructions. :)