linux-kernel - Re: x86: clang: acpi-cpufreq.c:970:24: error: variable 'ret' is uninitialized when used here [-Werror,-Wuninitialized]

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Message-Id: <f22ea97e-9d76-4c8b-a0c9-698db6e69a9f@app.fastmail.com>
Date:   Thu, 10 Nov 2022 12:19:07 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Naresh Kamboju" <naresh.kamboju@...aro.org>,
        "open list" <linux-kernel@...r.kernel.org>,
        linux-next <linux-next@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, llvm@...ts.linux.dev
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        "Viresh Kumar" <viresh.kumar@...aro.org>,
        "Linux PM" <linux-pm@...r.kernel.org>,
        "Nathan Chancellor" <nathan@...nel.org>,
        "Stuart Hayes" <stuart.w.hayes@...il.com>
Subject: Re: x86: clang: acpi-cpufreq.c:970:24: error: variable 'ret' is uninitialized
 when used here [-Werror,-Wuninitialized]

On Thu, Nov 10, 2022, at 12:14, Naresh Kamboju wrote:
> [Please ignore email this if it is already reported]
>
> Kernel build warning noticed on x86_64 with clang toolchain [1].
> Build failures noticed from next-20221108 .. next-20221110.
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1
> ARCH=x86_64 SRCARCH=x86 CROSS_COMPILE=x86_64-linux-gnu- HOSTCC=clang
> CC=clang
> 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.

This is caused by 13fdbc8b8da6 ("cpufreq: ACPI: Defer setting boost MSRs"),
which removes the initialization of this variable.

      Arnd