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: <d975895b-1ece-9944-8162-c7cc003b86dd@gmail.com>
Date:   Thu, 10 Nov 2022 14:17:38 -0600
From:   stuart hayes <stuart.w.hayes@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        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>
Subject: Re: x86: clang: acpi-cpufreq.c:970:24: error: variable 'ret' is
 uninitialized when used here [-Werror,-Wuninitialized]



On 11/10/2022 5:19 AM, Arnd Bergmann wrote:
> 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

Yes, I apologize for missing that.  A patch has already been submitted to
fix this:

https://lore.kernel.org/lkml/20221108170103.3375832-1-nathan@kernel.org/