[PATCH] Kill early might_sleep warnings

OK, I give up.  Kill all the might_sleep warnings from the early boot
process.

kernel/sched.c

@@ -2848,7 +2848,7 @@ void __might_sleep(char *file, int line)
 #if defined(in_atomic)
 	static unsigned long prev_jiffy;	/* ratelimiting */
 
-	if (in_atomic() || irqs_disabled()) {
+	if ((in_atomic() || irqs_disabled()) && system_running) {
 		if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
 			return;
 		prev_jiffy = jiffies;