> > We really can't. We _only_ have load-and-zero. And it has to be 16-byte
> > aligned. xchg() is just not something the CPU implements.
>
> The network code relies on the reader-xchg semantics David described in
> several places.
I guess the network code will just have to change for 2.5. read_xchg_val()
can be a null macro for everyone else at least
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