D36015.diff
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	diff --git a/sys/compat/linuxkpi/common/include/asm/atomic.h b/sys/compat/linuxkpi/common/include/asm/atomic.h
	--- a/sys/compat/linuxkpi/common/include/asm/atomic.h
	+++ b/sys/compat/linuxkpi/common/include/asm/atomic.h
	@@ -268,6 +268,28 @@
	__ret.val; \
	})

	+#define try_cmpxchg(p, op, n) \
	+({ \
	+ __typeof(p) __op = (__typeof((p)))(op); \
	+ __typeof((p)) __o = __op; \
	+ __typeof(*(p)) __p = __sync_val_compare_and_swap((p), (__o), (n)); \
	+ if (__p != __o) \
	+ *__op = __p; \
	+ (__p == __o); \
	+})
	+
	+#define __atomic_try_cmpxchg(type, _p, _po, _n) \
	+({ \
	+ __typeof(_po) __po = (_po); \
	+ __typeof((_po)) __r, __o = __po; \
	+ __r = atomic_cmpxchg##type((_p), __o, (_n)); \
	+ if (unlikely(__r != __o)) \
	+ *__po = __r; \
	+ likely(__r == __o); \
	+})
	+
	+#define atomic_try_cmpxchg(_p, _po, _n) __atomic_try_cmpxchg(, _p, _po, _n)
	+
	static inline int
	atomic_dec_if_positive(atomic_t *v)
	{