D17616.id49310.diff
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	Index: sys/sys/refcount.h
	===================================================================
	--- sys/sys/refcount.h
	+++ sys/sys/refcount.h
	@@ -55,6 +55,27 @@
	atomic_add_int(count, 1);
	}

	+/*
	+ * This functions returns true if the refcount was incremented. Else
	+ * false is returned.
	+ */
	+static __inline __result_use_check bool
	+refcount_acquire_unless_zero(volatile u_int *count)
	+{
	+ u_int c = *count;
	+
	+ KASSERT(c < UINT_MAX, ("refcount %p overflowed", count));
	+
	+ /* add one unless zero */
	+ for (;;) {
	+ if (c == 0)
	+ break;
	+ if (atomic_fcmpset_int(count, &c, c + 1))
	+ break;
	+ }
	+ return (c != 0);
	+}
	+
	static __inline int
	refcount_release(volatile u_int *count)
	{