linux-master/ipc/sem.c

200  *	* undo_list->lock for write
1839 /* If the task doesn't already have a undo_list, then allocate one
1852 	struct sem_undo_list *undo_list;
1854 	undo_list = current->sysvsem.undo_list;
1855 	if (!undo_list) {
1856 		undo_list = kzalloc(sizeof(*undo_list), GFP_KERNEL_ACCOUNT);
1857 		if (undo_list == NULL)
1859 		spin_lock_init(&undo_list->lock);
1860 		refcount_set(&undo_list->refcnt, 1);
1861 		INIT_LIST_HEAD(&undo_list->list_proc);
1863 		current->sysvsem.undo_list = undo_list;
1865 	*undo_listp = undo_list;
2308 	struct sem_undo_list *undo_list;
2312 		error = get_undo_list(&undo_list);
2315 		refcount_inc(&undo_list->refcnt);
2316 		tsk->sysvsem.undo_list = undo_list;
2318 		tsk->sysvsem.undo_list = NULL;
2339 	ulp = tsk->sysvsem.undo_list;
2342 	tsk->sysvsem.undo_list = NULL;