LK_WRITER_RECURSED
atomic_clear_ptr(&lk->lk_lock, LK_WRITER_RECURSED);
atomic_set_ptr(&lk->lk_lock, LK_WRITER_RECURSED);
(v & LK_WRITER_RECURSED)
(LK_SHARE | LK_ALL_WAITERS | LK_EXCLUSIVE_SPINNERS | LK_WRITER_RECURSED)