Revert "softirq: Let ksoftirqd do its job"

This reverts commit 4cd13c2.

kernel/softirq.c

@@ -77,17 +77,6 @@ static void wakeup_softirqd(void)
 		wake_up_process(tsk);
 }
 
-/*
- * If ksoftirqd is scheduled, we do not want to process pending softirqs
- * right now. Let ksoftirqd handle this at its own rate, to get fairness.
- */
-static bool ksoftirqd_running(void)
-{
-	struct task_struct *tsk = __this_cpu_read(ksoftirqd);
-
-	return tsk && (tsk->state == TASK_RUNNING);
-}
-
 /*
  * preempt_count and SOFTIRQ_OFFSET usage:
  * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving
@@ -325,7 +314,7 @@ asmlinkage __visible void do_softirq(void)
 
 	pending = local_softirq_pending();
 
-	if (pending && !ksoftirqd_running())
+	if (pending)
 		do_softirq_own_stack();
 
 	local_irq_restore(flags);
@@ -352,9 +341,6 @@ void irq_enter(void)
 
 static inline void invoke_softirq(void)
 {
-	if (ksoftirqd_running())
-		return;
-
 	if (!force_irqthreads) {
 #ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
 		/*