lkl: Fix memory leak of TIF_HOST_THREAD threads

Now the TIF_HOST_THREAD threads are not properly killed.

Signed-off-by: Yuan Liu <[email protected]>

Author: liuyuan10

arch/lkl/kernel/setup.c

@@ -75,6 +75,7 @@ int __init lkl_start_kernel(struct lkl_host_operations *ops,
 	}
 
 	lkl_ops->sem_down(init_sem);
+	lkl_ops->sem_free(init_sem);
 	current_thread_info()->tid = lkl_ops->thread_self();
 	lkl_cpu_change_owner(current_thread_info()->tid);
 

arch/lkl/kernel/threads.c

@@ -232,16 +232,16 @@ void threads_cnt_dec(void)
 
 void threads_cleanup(void)
 {
-	struct task_struct *p;
+	struct task_struct *p, *t;
 
-	for_each_process(p) {
-		struct thread_info *ti = task_thread_info(p);
+	for_each_process_thread(p, t) {
+		struct thread_info *ti = task_thread_info(t);
 
-		if (p->pid != 1)
-			WARN(!(p->flags & PF_KTHREAD),
-			     "non kernel thread task %p\n", p->comm);
-		WARN(p->state == TASK_RUNNING,
-		     "thread %s still running while halting\n", p->comm);
+		if (t->pid != 1 && !test_ti_thread_flag(ti, TIF_HOST_THREAD))
+			WARN(!(t->flags & PF_KTHREAD),
+			     "non kernel thread task %s\n", t->comm);
+		WARN(t->state == TASK_RUNNING,
+		     "thread %s still running while halting\n", t->comm);
 
 		kill_thread(ti);
 	}