linux-kernel - Re: [PATCH] cpufreq: qcom-cpufreq-hw: Fix 'make allmodconfig' build, part 2

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Date:   Wed, 25 Aug 2021 10:37:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Valdis Klētnieks <valdis.kletnieks@...edu>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        SeongJae Park <sj38.park@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: qcom-cpufreq-hw: Fix 'make allmodconfig' build,
 part 2

On 8/24/21 10:17 PM, Valdis Klētnieks wrote:
> Commit 86afc1df661a adds a reference to a symbol that doesn't have an
> EXPORT_PER_CPU_SYMBOL, which fails if qcom-cpufreq-hw is built as a module.
> 
> ERROR: modpost: "cpu_scale" [drivers/cpufreq/qcom-cpufreq-hw.ko] undefined!
> 
> Thanks to Seonjae Park for pointing me in the right direction.
> 
> Fixes: 86afc1df661a ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support")
> Suggested-by: SeongJae Park <sjpark@...zon.de>
> Signed-off-by: Valdis Kletnieks <valdis.kletnieks@...edu>
> 
> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index 921312a8d957..7e7de763bd88 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -149,6 +149,7 @@ void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
>   }
>   
>   DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
> +EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale);
>   
>   void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
>   {
> 

Hi Valdis,

I could not repro these build errors in today's linux-next.
It looks like someone has already merged an alternative patch
(and its follow-up):
   https://lore.kernel.org/lkml/a1053bd0e63ec0d985691b8a37bf7f6d5a1156aa.1629702403.git.viresh.kumar@linaro.org/

thanks.
-- 
~Randy