D17616.id49312.diff
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	Index: sys/sys/refcount.h
	===================================================================
	--- sys/sys/refcount.h
	+++ sys/sys/refcount.h
	@@ -77,14 +77,20 @@
	}

	/*
	+ * This functions returns non-zero if the refcount was
	+ * incremented. Else zero is returned.
	+ *
	* A temporary hack until refcount_* APIs are sorted out.
	*/
	-static __inline int
	+static __inline __result_use_check int
	refcount_acquire_if_not_zero(volatile u_int *count)
	{
	u_int old;

	old = *count;
	+
	+ KASSERT(old < UINT_MAX, ("refcount %p overflowed", count));
	+
	for (;;) {
	if (old == 0)
	return (0);