> > How about requiring that all 64-bit archs implement atomic64_t and do:
>
> It may be reasonable to have 64 bit arches that are not
> capable of 64 bit atomic ops. As far as I can remember sparc was initially
> a 32 bit platform without 32 bit atomic ops.
Why? I don't think we have any crippled 64bit platforms like this.
And if somebody wants to port linux to such a hypothetical crippled
64bit platform they can do the necessary work themselves.
Or just implement 64bit atomic_t with spinlocks.
-Andi
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