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

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Message-ID: <20200420092209.GA25831@qmqm.qmqm.pl>
Date:   Mon, 20 Apr 2020 11:22:09 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     kbuild test robot <lkp@...el.com>, 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 Tue, Apr 07, 2020 at 11:13:50AM -0700, Nick Desaulniers wrote:
> 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.

Hi,

For gcc this is bug 51513 [1]. This does not affect correctness of the
code, so I wonder if we should/need be trying to work around it.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51513

Best Regards,
Michał Mirosław