linux-kernel - Re: [patch 00/15] clocksource / timekeeping rework V4 (resend V3 + bug fix)

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Date:	Sat, 15 Aug 2009 12:08:35 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	john stultz <johnstul@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 00/15] clocksource / timekeeping rework V4 (resend V3 +
 bug fix)

On Sat, 15 Aug 2009, Ingo Molnar wrote:
> Yeah, nice cleanups!
> 
> I gave it some brief testing in tip:master and there's the new 
> lockdep assert below. Config and full bootlog attached.

Yeah, we need to call clocksource_change_rating() outside of watchdog
lock. Spotted a missing _irqrestore as well.

Thanks,

	tglx
---

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index a1657b5..02dc22d 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -307,16 +307,23 @@ static void clocksource_watchdog_work(struct work_struct *work)
 {
 	struct clocksource *cs, *tmp;
 	unsigned long flags;
+	LIST_HEAD(unstable);
 
 	spin_lock_irqsave(&watchdog_lock, flags);
 	list_for_each_entry_safe(cs, tmp, &watchdog_list, wd_list)
 		if (cs->flags & CLOCK_SOURCE_UNSTABLE) {
 			list_del_init(&cs->wd_list);
-			clocksource_change_rating(cs, 0);
+			list_add(&cs->wd_list, &unstable);
 		}
 	/* Check if the watchdog timer needs to be stopped. */
 	clocksource_stop_watchdog();
-	spin_unlock(&watchdog_lock);
+	spin_unlock_irqrestore(&watchdog_lock, flags);
+
+	/* Needs to be done outside of watchdog lock */
+	list_for_each_entry_safe(cs, tmp, &unstable, wd_list) {
+		list_del_init(&cs->wd_list);
+		clocksource_change_rating(cs, 0);
+	}
 }
 
 #else /* CONFIG_CLOCKSOURCE_WATCHDOG */
--
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