Commit 8e85b4b5 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
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softirqs, debug: preemption check 



if a preempt count leaks out of a softirq handler it can be very hard
to figure it out. Add a debug check for this.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 978b0116

kernel/softirq.c

+11 −0
Original line number Diff line number Diff line
@@ -205,7 +205,18 @@ asmlinkage void __do_softirq(void) 


	do {

		if (pending & 1) {

			int prev_count = preempt_count();



			h->action(h);



			if (unlikely(prev_count != preempt_count())) {

				printk(KERN_ERR "huh, entered sotfirq %ld %p"

				       "with preempt_count %08x,"

				       " exited with %08x?\n", h - softirq_vec,

				       h->action, prev_count, preempt_count());

				preempt_count() = prev_count;

			}



			rcu_bh_qsctr_inc(cpu);

		}

		h++;