linux-kernel - [BUG] 2.6.29.1-rt8, undefined reference to hrtimer_wait_for

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Date:	Tue, 21 Apr 2009 09:47:40 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Carsten Emde <ce@...g.ch>,
	Clark Williams <williams@...hat.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Robin Gareus <robin@...eus.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Philippe Reynes <philippe.reynes@...smpp.fr>,
	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	Darren Hart <dvhltc@...ibm.com>, Jan Blunck <jblunck@...e.de>,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>
Subject: [BUG] 2.6.29.1-rt8, undefined reference to hrtimer_wait_for_timer

when using patch-2.6.29.1-rt8 with CONFIG_PREEMPT_SOFTIRQS=y, but not
enable PREEMPT_RT, there will be an error when linking kernel:

undefined reference to hrtimer_wait_for_timer

I found that, hrtimer_wait_for_timer is only defined when PREEMPT_RT is
enabled, but in include/linux/hrtimer.h, the source code is like this:

#ifdef CONFIG_PREEMPT_SOFTIRQS
 extern void hrtimer_wait_for_timer(const struct hrtimer *timer);
#else
# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0)

a possible fix should be:

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 8bafa35..1c1cdf3 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -366,7 +366,7 @@ static inline int hrtimer_restart(struct hrtimer
*timer)
 }
 
 /* Softirq preemption could deadlock timer removal */
-#ifdef CONFIG_PREEMPT_SOFTIRQS
+#if defined(CONFIG_PREEMPT_SOFTIRQS) && defined(CONFIG_PREEMPT_RT)
   extern void hrtimer_wait_for_timer(const struct hrtimer *timer);
 #else
 # define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0)

-- 
Wu Zhangjin
DSLab, Lanzhou University, China
www.lemote.com, Jiangsu Province, China

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