[PATCH] highres: warn on softirq handling an unsafe callback

[Andres Salomon <dilinger@debian.org>]

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run_hrtimer_queue is called from a softirq context, and should never run
a callback that is classified as HRTIMER_CB_IRQSAFE_NO_SOFTIRQ.  A bug
in unrelated code had managed to trigger that bug, so let's add an
explicit warning to this function.

Signed-off-by: Andres Salomon <dilinger@debian.org>

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diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 476cb0c..167c296 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1130,6 +1130,7 @@ static inline void run_hrtimer_queue(struct hrtimer_cpu_base *cpu_base,
 		if (base->softirq_time.tv64 <= timer->expires.tv64)
 			break;
 
+		WARN_ON_ONCE(timer->cb_mode == HRTIMER_CB_IRQSAFE_NO_SOFTIRQ);
 		timer_stats_account_hrtimer(timer);
 
 		fn = timer->function;