[PATCH] Add fast little-endian switch system call

[Paul Mackerras]

Wolfgang Denk writes:

> This probably depends a bit on  the  performance  of  the  system  in
> question. Did you measure it - for example - on a 50 MHz MPC850 ?

The patch only affects arch/powerpc/kernel/entry_64.S.  So no, I
didn't measure it on a 50MHz MPC850, or indeed any 32-bit system. :)

Paul.