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Subject[rcu:dev.2021.05.02a 114/114] kernel/rcu/refscale.c:472:15: warning: variable 'x' set but not used
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.05.02a
head: 35d2c62851bc03a945ae81ab0726985f726107b1
commit: 35d2c62851bc03a945ae81ab0726985f726107b1 [114/114] refscale: Add measurement of clock readout
config: nios2-randconfig-r014-20210505 (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
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/paulmck/linux-rcu.git/commit/?id=35d2c62851bc03a945ae81ab0726985f726107b1
git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
git fetch --no-tags rcu dev.2021.05.02a
git checkout 35d2c62851bc03a945ae81ab0726985f726107b1
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=nios2

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

All warnings (new ones prefixed by >>):

kernel/rcu/refscale.c: In function 'ref_clock_section':
>> kernel/rcu/refscale.c:472:15: warning: variable 'x' set but not used [-Wunused-but-set-variable]
472 | volatile u64 x;
| ^
kernel/rcu/refscale.c: In function 'ref_clock_delay_section':
kernel/rcu/refscale.c:484:15: warning: variable 'x' set but not used [-Wunused-but-set-variable]
484 | volatile u64 x;
| ^


vim +/x +472 kernel/rcu/refscale.c

469
470 static void ref_clock_section(const int nloops)
471 {
> 472 volatile u64 x;
473 int i;
474
475 preempt_disable();
476 for (i = nloops; i >= 0; i--) {
477 x = ktime_get_real_fast_ns();
478 }
479 preempt_enable();
480 }
481

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