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

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Message-Id: <20210824091430.20367-1-sjpark@amazon.de>
Date:   Tue, 24 Aug 2021 09:14:30 +0000
From:   SeongJae Park <sj38.park@...il.com>
To:     Valdis Klētnieks <valdis.kletnieks@...edu>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: qcom-cpufreq-hw: Fix 'make allmodconfig' build

Hi,

On Sun, 22 Aug 2021 17:14:04 -0400 "Valdis Klētnieks" <valdis.kletnieks@...edu> wrote:

> 
> [-- Attachment #1: Type: text/plain, Size: 270 bytes --]
> 
> On Sun, 22 Aug 2021 14:08:08 -0700, Randy Dunlap said:
> 
> > This fixes one build error for me but I am still seeing another one:
> >
> > ERROR: modpost: "cpu_scale" [drivers/cpufreq/qcom-cpufreq-hw.ko] undefined!
> 
> That's a different patch, am working on fixing that one now..

I didn't take a deep look here, so I unsure if this is an appropriate fix, but
I was able to work-around this issue for my use case with below change.

```
--- 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)
 {
```


Thanks,
SJ