linux-kernel - Re: [tip:sched/core 14/47] kernel/sched/fair.c:893:22: error: variable 'p' set but not used

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Date:   Tue, 12 Oct 2021 13:26:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Yafang Shao <laoar.shao@...il.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [tip:sched/core 14/47] kernel/sched/fair.c:893:22: error:
 variable 'p' set but not used

On Tue, Oct 12, 2021 at 11:57:41AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
> head:   b2d5b9cec60fecc72a13191c2c6c05acf60975a5
> commit: 60f2415e19d3948641149ac6aca137a7be1d1952 [14/47] sched: Make schedstats helpers independent of fair sched class
> config: hexagon-buildonly-randconfig-r002-20211012 (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=60f2415e19d3948641149ac6aca137a7be1d1952
>         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 60f2415e19d3948641149ac6aca137a7be1d1952
>         # 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/fair.c:860:28: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable]
>                    struct sched_statistics *stats;
>                                             ^
>    kernel/sched/fair.c:892:27: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable]
>            struct sched_statistics *stats;
>                                     ^
> >> kernel/sched/fair.c:893:22: error: variable 'p' set but not used [-Werror,-Wunused-but-set-variable]
>            struct task_struct *p = NULL;
>                                ^
>    kernel/sched/fair.c:910:22: error: variable 'p' set but not used [-Werror,-Wunused-but-set-variable]
>            struct task_struct *p = NULL;
>                                ^
>    kernel/sched/fair.c:909:27: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable]
>            struct sched_statistics *stats;
>                                     ^
> >> kernel/sched/fair.c:936:22: error: variable 'tsk' set but not used [-Werror,-Wunused-but-set-variable]
>            struct task_struct *tsk = NULL;
>                                ^
>    kernel/sched/fair.c:935:27: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable]
>            struct sched_statistics *stats;
>                                     ^
>    kernel/sched/fair.c:4451:28: error: variable 'stats' set but not used [-Werror,-Wunused-but-set-variable]
>                    struct sched_statistics *stats;
>                                             ^
>    8 errors generated.

Again, I have absolutely no intention of fixing this. IMO this is the
compiler being a total pain in the arse.

Please stop reporting this.