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-rw-r--r--kernel/softirq.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 17caf4b63342..8ed90e3a88d6 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -78,6 +78,17 @@ static void wakeup_softirqd(void)
}
/*
+ * 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
* softirq processing.
@@ -313,7 +324,7 @@ asmlinkage __visible void do_softirq(void)
pending = local_softirq_pending();
- if (pending)
+ if (pending && !ksoftirqd_running())
do_softirq_own_stack();
local_irq_restore(flags);
@@ -340,6 +351,9 @@ 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
/*