[PATCH] powerpc/vdso: Avoid link stack corruption in __get_datapage()

[Michael Neuling]

> I've got the following results on POWER7 64bit
> without the patch:
> # ./tb
> time = 0.263337
> # ./tb
> time = 0.251273
> # ./tb
> time = 0.258453
> # ./tb
> time = 0.260189
> 
> with the patch:
> # ./tb
> time = 0.241517
> # ./tb
> time = 0.241973
> # ./tb
> time = 0.239365
> # ./tb
> time = 0.240109

Nice, I was expecting a bump there too but didn't test..  Looks like
about 7% to me.  

Thanks,
Mikey