linux-kernel - Re: [PATCH] cpufreq: ACPI: Remove unused variables 'acpi_cpufreq

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Date:   Thu, 10 Nov 2022 14:05:01 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Stuart Hayes <stuart.w.hayes@...il.com>,
        Tom Rix <trix@...hat.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] cpufreq: ACPI: Remove unused variables
 'acpi_cpufreq_online' and 'ret'

On Tue, Nov 8, 2022 at 9:01 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> Clang warns:
>
>   drivers/cpufreq/acpi-cpufreq.c:970:24: error: variable 'ret' is uninitialized when used here [-Werror,-Wuninitialized]
>           acpi_cpufreq_online = ret;
>                                 ^~~
>   drivers/cpufreq/acpi-cpufreq.c:960:9: note: initialize the variable 'ret' to silence this warning
>           int ret;
>                 ^
>                   = 0
>   1 error generated.
>
> Both ret and acpi_cpufreq_online are now unused so they can be safely
> removed, clearing up the warning.
>
> Fixes: 13fdbc8b8da6 ("cpufreq: ACPI: Defer setting boost MSRs")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1757
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Thanks for the patch!

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  drivers/cpufreq/acpi-cpufreq.c | 6 ------
>  1 file changed, 6 deletions(-)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index c8fdfcf659e6..74ef0e05ff7b 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -953,12 +953,8 @@ static struct cpufreq_driver acpi_cpufreq_driver = {
>         .attr           = acpi_cpufreq_attr,
>  };
>
> -static enum cpuhp_state acpi_cpufreq_online;
> -
>  static void __init acpi_cpufreq_boost_init(void)
>  {
> -       int ret;
> -
>         if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) {
>                 pr_debug("Boost capabilities not present in the processor\n");
>                 return;
> @@ -966,8 +962,6 @@ static void __init acpi_cpufreq_boost_init(void)
>
>         acpi_cpufreq_driver.set_boost = set_boost;
>         acpi_cpufreq_driver.boost_enabled = boost_state(0);
> -
> -       acpi_cpufreq_online = ret;
>  }
>
>  static int __init acpi_cpufreq_init(void)
>
> base-commit: 21cdb6c18f85fe538ca8740bc79f11fbe08d0197
> --
> 2.38.1
>


-- 
Thanks,
~Nick Desaulniers