> >
> > this patch adds atomic ops where there were none before
>
> nope... a spinlock/spinunlock contains atomic ops.
unlock usually doesn't but ok
>
> > for those architectures that need atomics for read (parisc? arm?)
>
> not today. No atomic needed for read.
>
> >
> > however.. wouldn't it be better to make this a per cpu variable for
> > write, and for read iterate or do something smart otherwise?
>
> So on a machine with 256 CPUS, you want to iterate 256 counters ?
you can be smart about this, similar to what ext3 and others do for
similar counters
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