linux-kernel - [tip:sched/core 17/47] kernel/sched/rt.c:1292:22: error: variable 'p' set but not used

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Date:   Tue, 12 Oct 2021 13:18:21 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [tip:sched/core 17/47] kernel/sched/rt.c:1292:22: error: variable
 'p' set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
head:   b2d5b9cec60fecc72a13191c2c6c05acf60975a5
commit: 57a5c2dafca8e3ce4f70e975a9c7727b66b5071f [17/47] sched/rt: Support schedstats for RT 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=57a5c2dafca8e3ce4f70e975a9c7727b66b5071f
        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 57a5c2dafca8e3ce4f70e975a9c7727b66b5071f
        # 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/rt.c:669:6: error: no previous prototype for function 'sched_rt_bandwidth_account' [-Werror,-Wmissing-prototypes]
   bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
        ^
   kernel/sched/rt.c:669:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
   ^
   static 
>> kernel/sched/rt.c:1292:22: error: variable 'p' set but not used [-Werror,-Wunused-but-set-variable]
           struct task_struct *p = NULL;
                               ^
   kernel/sched/rt.c:1311:22: error: variable 'p' set but not used [-Werror,-Wunused-but-set-variable]
           struct task_struct *p = NULL;
                               ^
   kernel/sched/rt.c:1341:22: error: variable 'p' set but not used [-Werror,-Wunused-but-set-variable]
           struct task_struct *p = NULL;
                               ^
   4 errors generated.


vim +/p +1292 kernel/sched/rt.c

  1287	
  1288	static inline void
  1289	update_stats_wait_start_rt(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se)
  1290	{
  1291		struct sched_statistics *stats;
> 1292		struct task_struct *p = NULL;
  1293	
  1294		if (!schedstat_enabled())
  1295			return;
  1296	
  1297		if (rt_entity_is_task(rt_se))
  1298			p = rt_task_of(rt_se);
  1299	
  1300		stats = __schedstats_from_rt_se(rt_se);
  1301		if (!stats)
  1302			return;
  1303	
  1304		__update_stats_wait_start(rq_of_rt_rq(rt_rq), p, stats);
  1305	}
  1306	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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