From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 24 Apr 2008 08:39:37 -0700 (PDT)

quoted text
> Heh. This is what x86 has done since day#1. I wonder why other 
> architectures wouldn't have copied that part..

I passed it around in a register because nothing outside of the trap
return and signal handling path needed access to it :-)
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