> I object to these uses of (synch_)cmpxchg on a uint16_t in common > code. > Many architectures, including PowerPC, do not support 2-byte atomic > operations, but this code is common to all Xen architectures. RMW operations you mean, I suppose. On PowerPC, all (naturally aligned) halfword operations are atomic; there do not exist any RMW operations; but word and doubleword atomic RMW operations can be emulated. Boils down to the same thing of course, but it isn't the same ;-) Segher
