linux-kernel - [peterz-queue:sched/core 14/19] arch/nds32/include/asm/current.h:10:13: warning: variable '$r25' set but not used

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Date:   Sat, 11 Sep 2021 03:32:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [peterz-queue:sched/core 14/19]
 arch/nds32/include/asm/current.h:10:13: warning: variable '$r25' set but not
 used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
head:   2dfdb3d20ad50e2ae2cb84cbceb0f0fc75e79e5d
commit: 0dc533504723599b41a4cefc6697379cddf55787 [14/19] sched: make schedstats helpers independent of fair sched class
config: nds32-buildonly-randconfig-r005-20210910 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 11.2.0
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/peterz/queue.git/commit/?id=0dc533504723599b41a4cefc6697379cddf55787
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue sched/core
        git checkout 0dc533504723599b41a4cefc6697379cddf55787
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=nds32 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   kernel/sched/fair.c: In function 'update_stats_wait_start_fair':
   kernel/sched/fair.c:893:29: warning: variable 'p' set but not used [-Wunused-but-set-variable]
     893 |         struct task_struct *p = NULL;
         |                             ^
   kernel/sched/fair.c:892:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable]
     892 |         struct sched_statistics *stats;
         |                                  ^~~~~
   kernel/sched/fair.c: In function 'update_stats_wait_end_fair':
   kernel/sched/fair.c:910:29: warning: variable 'p' set but not used [-Wunused-but-set-variable]
     910 |         struct task_struct *p = NULL;
         |                             ^
   kernel/sched/fair.c:909:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable]
     909 |         struct sched_statistics *stats;
         |                                  ^~~~~
   In file included from include/linux/sched.h:12,
                    from kernel/sched/sched.h:5,
                    from kernel/sched/fair.c:23:
   kernel/sched/fair.c: In function 'update_stats_enqueue_sleeper_fair':
>> arch/nds32/include/asm/current.h:10:13: warning: variable '$r25' set but not used [-Wunused-but-set-variable]
      10 | #define tsk $r25
         |             ^~~~
   kernel/sched/fair.c:936:29: note: in expansion of macro 'tsk'
     936 |         struct task_struct *tsk = NULL;
         |                             ^~~
   kernel/sched/fair.c:935:34: warning: variable 'stats' set but not used [-Wunused-but-set-variable]
     935 |         struct sched_statistics *stats;
         |                                  ^~~~~


vim +10 arch/nds32/include/asm/current.h

a15e9ffa877852 Greentime Hu 2017-10-24   6  
a15e9ffa877852 Greentime Hu 2017-10-24   7  #ifndef __ASSEMBLY__
a15e9ffa877852 Greentime Hu 2017-10-24   8  register struct task_struct *current asm("$r25");
a15e9ffa877852 Greentime Hu 2017-10-24   9  #endif /* __ASSEMBLY__ */
a15e9ffa877852 Greentime Hu 2017-10-24 @10  #define tsk $r25
a15e9ffa877852 Greentime Hu 2017-10-24  11  

:::::: The code at line 10 was first introduced by commit
:::::: a15e9ffa877852e529db33cc615c132bad2fc60a nds32: Process management

:::::: TO: Greentime Hu <greentime@...estech.com>
:::::: CC: Greentime Hu <greentime@...estech.com>

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

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