RE: down_spin() implementation

[Luck, Tony]

> So it makes little sense to add this to semaphores.  Better to introduce
> a spinaphore, as you say.

> struct {
>   atomic_t cur;
>   int max;
> } ss_t;

Could this API sneak into the bottom of one or the other of
linux/include/{spinlock,semaphore}.h ... or should it get its own
spinaphore.h file?

Or should I follow Alan's earlier advice and keep this as an ia64
only thing (since I'll be the only user).

-Tony
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