void *rcu_cmpxchg_pointer_sym(void **p, void *old, void *_new)
{
wmb();
- return uatomic_cmpxchg(p, old, _new);
+ if (likely(URCU_CAS_AVAIL()))
+ return uatomic_cmpxchg(p, old, _new);
+
+ /* Compatibility for i386. Old-timer. */
+ return compat_uatomic_cmpxchg(p, old, _new);
}