Messages in this thread | | | Date | Thu, 6 May 2021 10:16:43 +0800 | From | kernel test robot <> | Subject | [rcu:dev.2021.05.02a 114/114] kernel/rcu/refscale.c:472:15: warning: variable 'x' set but not used |
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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
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