linux-kernel - Re: sparc64 allmodconfig build failure...

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Date:	Tue, 14 Oct 2008 16:06:05 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Sven Wegener <sven.wegener@...aler.net>
Cc:	David Miller <davem@...emloft.net>, davej@...hat.com,
	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org
Subject: Re: sparc64 allmodconfig build failure...

On Tue, Oct 14, 2008 at 10:30:20AM +0200, Sven Wegener wrote:
> On Mon, 13 Oct 2008, David Miller wrote:
> 
> > sparc64 allmodconfig started failing to build recently:
> > 
> >   MODPOST 1946 modules
> > ERROR: "cpufreq_gov_performance" [arch/sparc64/kernel/us3_cpufreq.ko] undefined!
> > 
> > It seems to be caused by the following commit:
> > 
> > commit c4d14bc0bb5d13e316890651ae4518b764c3344c
> > Author: Sven Wegener <sven.wegener@...aler.net>
> > Date:   Sat Sep 20 16:50:08 2008 +0200
> > 
> >     [CPUFREQ] Don't export governors for default governor
> >     
> >     We don't need to export the governors for use as the default governor,
> >     because the default governor will be built-in anyway and we can access
> >     the symbol directly.
> 
> Uhm, we could resolve this dependency with the patch below. Although we 
> might as well revert the above commit or introduce an exported function 
> that sets the default governor on a policy.
> 
> Subject: [CPUFREQ] Fix build failure on sparc64
> 
> Commit c4d14bc0bb5d13e316890651ae4518b764c3344c ("[CPUFREQ] Don't export 
> governors for default governor") caused a build failure, because there are 
> several architectures that have cpufreq code that can be built as a 
> module, but the code also requires access to the default governor. Export 
> the default governor so that it can be accessed by these module.

> --- a/drivers/cpufreq/cpufreq_conservative.c
> +++ b/drivers/cpufreq/cpufreq_conservative.c
> @@ -576,7 +576,9 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
>  	return 0;
>  }
>  
> -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
> +#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
> +EXPORT_SYMBOL(cpufreq_gov_conservative);
> +#else
>  static
>  #endif

This is ugly, ugly.
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