linux-kernel - Re: Latest Linus git: kernel/sched.c:1216: warning: ‘init

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Message-ID: <20080513132328.GB5809@elte.hu>
Date:	Tue, 13 May 2008 15:23:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kevin Winchester <kjwinchester@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Latest Linus git: kernel/sched.c:1216: warning: ‘init_hrtick’ defined but not used


* Kevin Winchester <kjwinchester@...il.com> wrote:

> Hi Ingo,
>
> I got the above warning in my latest build.  I assume it is because 
> init_hrtick() is only called from CONFIG_SMP sched_init_smp(), and I 
> have a HRT-enabled UP box.
>
> I could write up the simple patch to put #ifdef CONFIG_SMP around 
> init_hrtick(), but with all of the #ifdefs in that file, I figure it 
> is probably a little more complicated than that.

the fix seems simple - see below. The #ifdef jungle ... less so.

	Ingo

--------------->
Subject: sched: fix defined-but-unused warning
From: Rabin Vincent <rabin@....in>
Date: Sun, 11 May 2008 05:55:33 +0530

Fix this warning, which appears with !CONFIG_SMP:
kernel/sched.c:1216: warning: `init_hrtick' defined but not used

Signed-off-by: Rabin Vincent <rabin@....in>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -1130,6 +1130,7 @@ static enum hrtimer_restart hrtick(struc
 	return HRTIMER_NORESTART;
 }
 
+#ifdef CONFIG_SMP
 static void hotplug_hrtick_disable(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
@@ -1185,6 +1186,7 @@ static void init_hrtick(void)
 {
 	hotcpu_notifier(hotplug_hrtick, 0);
 }
+#endif /* CONFIG_SMP */
 
 static void init_rq_hrtick(struct rq *rq)
 {
--
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