linux-kernel - Re: [PATCH] cpufreq: qcom-hw: add CONFIG_COMMON

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Date: Thu, 15 Feb 2024 14:08:39 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Xiu Jianfeng <xiujianfeng@...wei.com>,
	Arnd Bergmann <arnd@...db.de>,
	Alexander Stein <alexander.stein@...tq-group.com>,
	Jingyu Wang <jingyuwang_vip@....com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: qcom-hw: add CONFIG_COMMON_CLK dependency

On 15-02-24, 09:33, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> It is still possible to compile-test a kernel without CONFIG_COMMON_CLK
> for some ancient ARM boards or other architectures, but this causes a
> link failure in the qcom-cpufreq-hw driver:
> 
> ERROR: modpost: "devm_clk_hw_register" [drivers/cpufreq/qcom-cpufreq-hw.ko] undefined!
> ERROR: modpost: "devm_of_clk_add_hw_provider" [drivers/cpufreq/qcom-cpufreq-hw.ko] undefined!
> ERROR: modpost: "of_clk_hw_onecell_get" [drivers/cpufreq/qcom-cpufreq-hw.ko] undefined!
> 
> Add a Kconfig dependency here to make sure this always work. Apparently
> this bug has been in the kernel for a while without me running into it
> on randconfig builds as COMMON_CLK is almost always enabled.
> 
> I have cross-checked by building an allmodconfig kernel with COMMON_CLK
> disabled, which showed no other driver having this problem.
> 
> Fixes: 4370232c727b ("cpufreq: qcom-hw: Add CPU clock provider support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/cpufreq/Kconfig.arm | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index f911606897b8..a0ebad77666e 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -173,6 +173,7 @@ config ARM_QCOM_CPUFREQ_NVMEM
>  config ARM_QCOM_CPUFREQ_HW
>  	tristate "QCOM CPUFreq HW driver"
>  	depends on ARCH_QCOM || COMPILE_TEST
> +	depends on COMMON_CLK
>  	help
>  	  Support for the CPUFreq HW driver.
>  	  Some QCOM chipsets have a HW engine to offload the steps

Applied. Thanks.

-- 
viresh