>I never got a satisfactory answer about whether you need a h/w lock, or
>whether the low-level bus serializes transactions correctly on SMP...
What sort of serialising are you thinking of? Single bus operations are
atomic, so you don't need a lock purely because (say) both CPUs might want to
write the same register at the same moment. But there are few guarantees
beyond that; if you are doing read-modify-write, or more complex transactions,
you probably do need your own locks.
p.
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