Re: 2.6.6-mm5

Matt Mackall
2004-05-24T16:17:41Z

On Sat, May 22, 2004 at 06:15:51PM -0700, Roland Dreier wrote:
> Andrew> I don't think we can expect all architectures to be able
> Andrew> to implement atomic 64-bit IO's, can we?
>
> Andrew> ergo, drivers which want to use readq and writeq should
> Andrew> provide the appropriate locking.
>
> Perhaps we should have ARCH_HAS_ATOMIC_WRITEQ or something so that
> drivers don't add the overhead of locking on architectures where it's
> not necessary?

Or perhaps we just need a lockless __readq/__writeq for drivers that
know better.

--
Mathematics is the supreme nostalgia of our time.