Function _refcount_update_saturated

freebsd/sys/refcount.h:51–59

* Attempt to handle reference count overflow and underflow. Force the counter * to stay at the saturation value so that a counter overflow cannot trigger * destruction of the containing object and instead leads to a less harmful * memory leak. */

 * memory leak.
 */
static __inline void
_refcount_update_saturated(volatile u_int *count)
{
#ifdef INVARIANTS
	panic("refcount %p wraparound", count);
#else
	atomic_store_int(count, REFCOUNT_SATURATION_VALUE);
#endif
}

static __inline void
refcount_init(volatile u_int *count, u_int value)