linux-kernel - Re: [PATCH v3 07/11] power: supply: core: tabularize HWMON temperature labels

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Date:   Tue, 7 Apr 2020 11:13:50 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 07/11] power: supply: core: tabularize HWMON
 temperature labels

On Sat, Apr 4, 2020 at 6:53 PM kbuild test robot <lkp@...el.com> wrote:
>
> Hi "Michał,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on power-supply/for-next]
> [also build test WARNING on hwmon/hwmon-next linus/master v5.6 next-20200404]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url:    https://github.com/0day-ci/linux/commits/Micha-Miros-aw/extensions-and-fixes/20200405-044024
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next
> config: x86_64-randconfig-b002-20200405 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 62f3a9650a9f289a07a5f480764fb655178c2334)
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/power/supply/power_supply_hwmon.o: warning: objtool: power_supply_hwmon_read_string() falls through to next function power_supply_hwmon_write()

I'm guessing this is from the unreachable:
https://github.com/0day-ci/linux/commit/b8b2d14ca46ca54257f55c9af58ea25695b9ee36
I'll need to play with this some more as I couldn't reproduce with a
simplified test case, but looks like a compiler bug.  Filed
https://github.com/ClangBuiltLinux/linux/issues/978 for me to track.

-- 
Thanks,
~Nick Desaulniers