Christoph Lameter wrote on Thursday, March 30, 2006 6:38 PM
> > > Neither one is correct because there will always be one combination of
> > > clear_bit with these macros that does not generate the required memory
> > > barrier.
> >
> > Can you give an example? Which combination?
>
> For Option(1)
>
> smp_mb__before_clear_bit()
> clear_bit(...)(
Sorry, you totally lost me. It could me I'm extremely slow today. For
option (1), on ia64, clear_bit has release semantic already. The comb
of __before_clear_bit + clear_bit provides the required ordering. Did
I miss something? By the way, we are talking about detail implementation
on one specific architecture. Not some generic concept that clear_bit
has no ordering stuff in there.
- Ken
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