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Date:   Wed, 13 Oct 2021 17:16:57 +0800
From:   Philip Li <philip.li@...el.com>
To:     Yicong Yang <yangyicong@...ilicon.com>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, Barry Song <baohua@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: [kbuild-all] Re: [tip:sched/core 45/47]
 kernel/sched/topology.c:23:20: error: unused function 'sched_debug'

On Wed, Oct 13, 2021 at 05:02:42PM +0800, Yicong Yang wrote:
> Hi,
> 
> On 2021/10/13 2:30, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
> > head:   b2d5b9cec60fecc72a13191c2c6c05acf60975a5
> > commit: f43df9225fcad9b07a4ef4d0fe4c3ad2fb4ce82d [45/47] sched/topology: Remove unused numa_distance in cpu_attach_domain()
> > config: hexagon-buildonly-randconfig-r004-20211012 (attached as .config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dcf39554dbea780d6cb7e12239451ba47a2668)
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=f43df9225fcad9b07a4ef4d0fe4c3ad2fb4ce82d
> >         git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> >         git fetch --no-tags tip sched/core
> >         git checkout f43df9225fcad9b07a4ef4d0fe4c3ad2fb4ce82d
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon 
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All errors (new ones prefixed by >>):
> > 
> >>> kernel/sched/topology.c:23:20: error: unused function 'sched_debug' [-Werror,-Wunused-function]
> >    static inline bool sched_debug(void)
> >                       ^
> >    1 error generated.
> > 
> 
> sched_debug() is unused if CONFIG_ENERGY_MODEL=n || CONFIG_CPU_FREQ_GOV_SCHEDUTIL=n and CONFIG_NUMA=n,
> which is the case in the report. This is not introduced by this patch.
> 
> A __maybe_unused qualify for sched_debug() may fix this. Not sure we intends to do so.
Hi Yicong, you may wait for Peter's input. 0-day CI is consulting Peter what the appropriate
scope is to ignore the W=1 related warnings at
https://lore.kernel.org/llvm/CALOAHbDkBn3LDsNvSXujMiQXrLHdRsfvJUqJv_eTh4s63osuTw@mail.gmail.com/T/#m516619d3b8b632e457522ef7827694f9b47c574c

We will not reporting out such un-interested issues anymore per the input.

> 
> > 
> > vim +/sched_debug +23 kernel/sched/topology.c
> > 
> > f2cb13609d5397 Ingo Molnar    2017-02-01  22  
> > f2cb13609d5397 Ingo Molnar    2017-02-01 @23  static inline bool sched_debug(void)
> > f2cb13609d5397 Ingo Molnar    2017-02-01  24  {
> > 9406415f46f612 Peter Zijlstra 2021-04-15  25  	return sched_debug_verbose;
> > f2cb13609d5397 Ingo Molnar    2017-02-01  26  }
> > f2cb13609d5397 Ingo Molnar    2017-02-01  27  
> > 
> > :::::: The code at line 23 was first introduced by commit
> > :::::: f2cb13609d5397cdd747f3ed6fb651233851717d sched/topology: Split out scheduler topology code from core.c into topology.c
> > 
> > :::::: TO: Ingo Molnar <mingo@...nel.org>
> > :::::: CC: Ingo Molnar <mingo@...nel.org>
> > 
> > ---
> > 0-DAY CI Kernel Test Service, Intel Corporation
> > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
> > 
> _______________________________________________
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