refcount_inc_not_zero
if (!refcount_inc_not_zero(&wl->refcount))
if (refcount_inc_not_zero(&wl->refcount))
bool held = refcount_inc_not_zero(&vma_res->hold_count);
if (!refcount_inc_not_zero(&wf->count)) {
if (!refcount_inc_not_zero(&wf->count)) {