__HAVE_ARCH_CMPXCHG on ARM?

[Sebastian Andrzej Siewior]

* Josh Cartwright | 2015-02-03 13:27:30 [-0600]:

>                 native         native
>                cmpxchg (UP)   cmpxchg (SMP)    __HAVE_ARCH_CMPXCHG
>         xtensa     X               X

This one does not always have cmpxchg on UP (only the SMP variant which
provides atomic operation).

>  Josh

Sebastian