linux-kernel - Re: 2.6.18-rt1

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Date:	Wed, 20 Sep 2006 21:20:21 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Gene Heskett <gene.heskett@...izon.net>
Cc:	linux-kernel@...r.kernel.org, paulmck@...ibm.com,
	Daniel Walker <dwalker@...sta.com>,
	Ingo Molnar <mingo@...e.hu>, John Stultz <johnstul@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: 2.6.18-rt1

On Wed, 2006-09-20 at 20:47 +0200, Thomas Gleixner wrote:
> On Wed, 2006-09-20 at 14:36 -0400, Gene Heskett wrote:
> > That looks like the chorus of the song I saw when it crashed on boot, 
> > pretty darned close to identical.
> 
> I can reproduce it. It happens when CONFIG_HIGH_RES_TIMERS is off.
> Looking into it right now.

Fix below.

	tglx

Index: linux-2.6.18/kernel/hrtimer.c
===================================================================
--- linux-2.6.18.orig/kernel/hrtimer.c	2006-09-20 19:10:05.000000000 +0200
+++ linux-2.6.18/kernel/hrtimer.c	2006-09-20 21:11:26.000000000 +0200
@@ -873,9 +873,6 @@ static inline void hrtimer_init_hres(str
 	set_bit(0, &base->check_clocks);
 	base->hres_active = 0;
 	hrtimer_init_base_cb_pending(base);
-#ifdef CONFIG_PREEMPT_SOFTIRQS
-	init_waitqueue_head(&base->wait);
-#endif
 }
 
 static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
@@ -1643,6 +1640,9 @@ static void __devinit init_hrtimers_cpu(
 		cpu_base->clock_base[i].cpu_base = cpu_base;
 
 	hrtimer_init_hres(cpu_base);
+#ifdef CONFIG_PREEMPT_SOFTIRQS
+	init_waitqueue_head(&cpu_base->wait);
+#endif
 }
 
 #ifdef CONFIG_HOTPLUG_CPU


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