[2.4] SLB noloop patch

[Olof Johansson]

The 2.5 equivalent of this patch got baked into Anton's big SLB rewrite.
There seems to be less interest to bring the bigger rewrite back to 2.4,
but the noloop stuff is still a valuable enhancement (and smaller in scope).

I've attached the patch, unless someone objects I'll push it to ameslab
early next week (with the hope that it'll make it to Marcelo as well).

Thanks,

-Olof

--
Olof Johansson                                        Office: 4F005/905
pSeries Linux Development                             IBM Systems Group
Email: olof at austin.ibm.com                          Phone: 512-838-9858
All opinions are my own and not those of IBM
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