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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Carsten Emde <C.Emde@osadl.org>, Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 06/16] softirq: Add more debugging
Date: Wed, 13 Feb 2013 17:12:01 +0100
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From: Thomas Gleixner <tglx@linutronix.de>
We really want to find code which calls __raise_softirq_irqsoff() and
runs neither in hardirq context nor in a local_bh disabled
region. This is even wrong on mainline as that code relies on random
events to take care of it's newly raised softirq.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/softirq.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
Index: linux-3.2.35-rt53/kernel/softirq.c
===================================================================
@ linux-3.2.35-rt53/kernel/softirq.c:608 @ void thread_do_softirq(void)
}
}
-void __raise_softirq_irqoff(unsigned int nr)
+static void do_raise_softirq_irqoff(unsigned int nr)
{
trace_softirq_raise(nr);
or_softirq_pending(1UL << nr);
@ linux-3.2.35-rt53/kernel/softirq.c:625 @ void __raise_softirq_irqoff(unsigned int
__this_cpu_read(ksoftirqd)->softirqs_raised |= (1U << nr);
}
+void __raise_softirq_irqoff(unsigned int nr)
+{
+ do_raise_softirq_irqoff(nr);
+ if (!in_irq() && !current->softirq_nestcnt)
+ wakeup_softirqd();
+}
+
/*
* This function must run with irqs disabled!
*/
void raise_softirq_irqoff(unsigned int nr)
{
- __raise_softirq_irqoff(nr);
+ do_raise_softirq_irqoff(nr);
/*
* If we're in an hard interrupt we let irq return code deal
@ linux-3.2.35-rt53/kernel/softirq.c:659 @ void raise_softirq_irqoff(unsigned int n
wakeup_softirqd();
}
-void do_raise_softirq_irqoff(unsigned int nr)
-{
- raise_softirq_irqoff(nr);
-}
-
static inline int ksoftirqd_softirq_pending(void)
{
return current->softirqs_raised;