vfree_deferred
struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq);
struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
struct vfree_deferred *p;
p = &per_cpu(vfree_deferred, i);
static DEFINE_PER_CPU(struct vfree_deferred, vfree_deferred);