freezer: don't distinguish nosig tasks on thaw

There's no point in thawing nosig tasks before others.  There's no
ordering requirement between the two groups on thaw, which the staged
thawing can't guarantee anyway.  Simplify thaw_processes() by removing
the distinction and collapsing thaw_tasks() into thaw_processes().
This will help further updates to freezer.
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/power/process.c

@@ -170,34 +170,28 @@ int freeze_kernel_threads(void)
 	return error;
 }
 
-static void thaw_tasks(bool nosig_only)
+void thaw_processes(void)
 {
 	struct task_struct *g, *p;
 
+	oom_killer_enable();
+
+	printk("Restarting tasks ... ");
+
+	thaw_workqueues();
+
 	read_lock(&tasklist_lock);
 	do_each_thread(g, p) {
 		if (!freezable(p))
 			continue;
 
-		if (nosig_only && should_send_signal(p))
-			continue;
-
 		if (cgroup_freezing_or_frozen(p))
 			continue;
 
 		__thaw_task(p);
 	} while_each_thread(g, p);
 	read_unlock(&tasklist_lock);
-}
-
-void thaw_processes(void)
-{
-	oom_killer_enable();
 
-	printk("Restarting tasks ... ");
-	thaw_workqueues();
-	thaw_tasks(true);
-	thaw_tasks(false);
 	schedule();
 	printk("done.\n");
 }