[parisc-linux] backport bitops.h stuff

[Joel Soete]

> Actually, this patch looks decidedly non-optimal.

> See include/linux/bitops.h:generic_ffs for how it should be done on
> architectures that don't have any machine instruction help.  That's only
> four if statements and no loop.

Yes it was like this (just a lake of #include <linux/bitops.h>) into 2.4

Why was it is changed in 2.5?

> I see we already have the loop thing in 2.5, but should we consider
> simply using the generic operations there as well?

> even for __ffs, which is just a slight optimisation over ffs, using
> generic_ffs would probably be faster

If I have time next week I can test your idea.

Thanks,
    Joel


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