RWSEM_OWNER_UNKNOWN  124 include/linux/percpu-rwsem.h 		atomic_long_set(&sem->rw_sem.owner, RWSEM_OWNER_UNKNOWN);
RWSEM_OWNER_UNKNOWN  663 kernel/locking/rwsem.c 	BUILD_BUG_ON(!(RWSEM_OWNER_UNKNOWN & RWSEM_NONSPINNABLE));