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

From: kernel test robot
Date: Fri Sep 10 2021 - 15:33:25 EST


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@xxxxxxxxx>

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@xxxxxxxxxxxxx>
:::::: CC: Greentime Hu <greentime@xxxxxxxxxxxxx>

---
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