linux-kernel - Re: [was: mmotm 2009-10-09-01-07 uploaded]

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Message-Id: <20091009083028.61f44133.rdunlap@xenotime.net>
Date:	Fri, 9 Oct 2009 08:30:28 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Jiri Slaby <jirislaby@...il.com>, akpm <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org
Subject: Re: [was: mmotm 2009-10-09-01-07 uploaded]

On Fri, 09 Oct 2009 12:00:55 +0200 Jiri Slaby wrote:

> On 10/09/2009 10:07 AM, akpm@...ux-foundation.org wrote:
> > The mm-of-the-moment snapshot 2009-10-09-01-07 has been uploaded to
> 
> Hi, build fails with:
> ERROR: "cpufreq_get" [arch/x86/kvm/kvm.ko] undefined!
> because of
> CONFIG_KVM=m
> ...
> # CONFIG_CPU_FREQ is not set
> 
> Should cpufreq_get be defined as inline return 0 the same as
> cpufreq_quick_get on !CONFIG_CPU_FREQ?

I submitted a patch for that several days ago, against
linux-next-20091006.  (below again)

---
From: Randy Dunlap <randy.dunlap@...cle.com>

When CONFIG_CPU_FREQ is disabled, cpufreq_get() needs a stub.
Used by kvm (although it looks like a bit of the kvm code could
be omitted when CONFIG_CPU_FREQ is disabled).

arch/x86/built-in.o: In function `kvm_arch_init':
(.text+0x10de7): undefined reference to `cpufreq_get'
 
Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
Tested-by: Eric Paris <eparis@...hat.com>
---
 include/linux/cpufreq.h |    7 +++++++
 1 file changed, 7 insertions(+)

--- linux-next-20091006.orig/include/linux/cpufreq.h
+++ linux-next-20091006/include/linux/cpufreq.h
@@ -291,8 +291,15 @@ struct global_attr {
 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 int cpufreq_update_policy(unsigned int cpu);
 
+#ifdef CONFIG_CPU_FREQ
 /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
 unsigned int cpufreq_get(unsigned int cpu);
+#else
+static inline unsigned int cpufreq_get(unsigned int cpu)
+{
+	return 0;
+}
+#endif
 
 /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
 #ifdef CONFIG_CPU_FREQ
--
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