D43255.diff
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	diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
	--- a/sys/kern/vfs_subr.c
	+++ b/sys/kern/vfs_subr.c
	@@ -3345,14 +3345,11 @@
	void
	vrefact(struct vnode *vp)
	{
	+ int old __diagused;

	CTR2(KTR_VFS, "%s: vp %p", __func__, vp);
	-#ifdef INVARIANTS
	- int old = atomic_fetchadd_int(&vp->v_usecount, 1);
	+ old = refcount_acquire(&vp->v_usecount);
	VNASSERT(old > 0, vp, ("%s: wrong use count %d", __func__, old));
	-#else
	- refcount_acquire(&vp->v_usecount);
	-#endif
	}

	void