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

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Message-Id: <20091009161552.fdbaf350.akpm@linux-foundation.org>
Date:	Fri, 9 Oct 2009 16:15:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	Dave Jones <davej@...emonkey.org.uk>
Subject: Re: [was: mmotm 2009-10-09-01-07 uploaded]

On Fri, 9 Oct 2009 08:30:28 -0700
Randy Dunlap <rdunlap@...otime.net> wrote:

> 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

Thanks.  I'll merge this into mainline in the next batch I think.  It's
only needed by the KVM development tree but it's the correct thing to
do anyway and having it in minaline will simplify life for everyone.

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