>The only thing you need is to make sure there is a store in "spin_unlock()",
So we could reimplement a rmb() (and in turn an mb()) that scales in SMP?
Something like:
#define rmb() ... "movb $0, ZERO_PAGE+32*smp_processor_id()"
This because the spin_unlock really is:
mb();
spin_lock.lock = 0;
If spin_unlock() doesn't need the lock, mb() doesn't need the lock
on the bus either.
Am I missing something?
Andrea
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