diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3d95c480f58..28000b1658f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1317,6 +1317,7 @@ extern int in_egroup_p(gid_t);
 
 extern void proc_caches_init(void);
 extern void flush_signals(struct task_struct *);
+extern void ignore_signals(struct task_struct *);
 extern void flush_signal_handlers(struct task_struct *, int force_default);
 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
 
diff --git a/kernel/exit.c b/kernel/exit.c
index bc982cd7274..b0c6f0c3a2d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -347,7 +347,7 @@ int disallow_signal(int sig)
 		return -EINVAL;
 
 	spin_lock_irq(&current->sighand->siglock);
-	sigaddset(&current->blocked, sig);
+	current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 	return 0;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 0eb0070a3c5..df8a8e8f6ca 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -215,24 +215,13 @@ EXPORT_SYMBOL(kthread_stop);
 static __init void kthreadd_setup(void)
 {
 	struct task_struct *tsk = current;
-	struct k_sigaction sa;
-	sigset_t blocked;
 
 	set_task_comm(tsk, "kthreadd");
 
-	/* Block and flush all signals */
-	sigfillset(&blocked);
-	sigprocmask(SIG_BLOCK, &blocked, NULL);
-	flush_signals(tsk);
+	ignore_signals(tsk);
 
-	/* SIG_IGN makes children autoreap: see do_notify_parent(). */
-	sa.sa.sa_handler = SIG_IGN;
-	sa.sa.sa_flags = 0;
-	siginitset(&sa.sa.sa_mask, sigmask(SIGCHLD));
-	do_sigaction(SIGCHLD, &sa, (struct k_sigaction *)0);
-
-	set_user_nice(current, -5);
-	set_cpus_allowed(current, CPU_MASK_ALL);
+	set_user_nice(tsk, -5);
+	set_cpus_allowed(tsk, CPU_MASK_ALL);
 }
 
 int kthreadd(void *unused)
diff --git a/kernel/signal.c b/kernel/signal.c
index 23ae6d62fc4..2ac3a668d9d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -209,6 +209,16 @@ void flush_signals(struct task_struct *t)
 	spin_unlock_irqrestore(&t->sighand->siglock, flags);
 }
 
+void ignore_signals(struct task_struct *t)
+{
+	int i;
+
+	for (i = 0; i < _NSIG; ++i)
+		t->sighand->action[i].sa.sa_handler = SIG_IGN;
+
+	flush_signals(t);
+}
+
 /*
  * Flush all handlers for a task.
  */