On Wed, May 12, 2021 at 07:38:22PM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: ec85c95b0c90a17413901b018e8ade7b9eae7cad > commit: 4b46fcb7f1a6a202e3f77ce377079b4243d1be6f [1888/2633] refscale: Add measurement of clock readout > config: riscv-randconfig-r022-20210512 (attached as .config) > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a0fed635fe1701470062495a6ffee1c608f3f1bc) > 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 > # install riscv cross compiling tool for clang build > # apt-get install binutils-riscv64-linux-gnu > # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=4b46fcb7f1a6a202e3f77ce377079b4243d1be6f > git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > git fetch --no-tags linux-next master > git checkout 4b46fcb7f1a6a202e3f77ce377079b4243d1be6f > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv > > 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/rcu/refscale.c:479:3: warning: variable 'x' is uninitialized when used here [-Wuninitialized] > x += ktime_get_real_fast_ns(); > ^ > kernel/rcu/refscale.c:474:7: note: initialize the variable 'x' to silence this warning > u64 x; > ^ > = 0 > kernel/rcu/refscale.c:492:3: warning: variable 'x' is uninitialized when used here [-Wuninitialized] > x += ktime_get_real_fast_ns(); > ^ > kernel/rcu/refscale.c:487:7: note: initialize the variable 'x' to silence this warning > u64 x; > ^ > = 0 > 2 warnings generated. > > Kconfig warnings: (for reference only) > WARNING: unmet direct dependencies detected for LOCKDEP > Depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT && (FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86) > Selected by > - DEBUG_LOCK_ALLOC && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT Fixed by updated commit 210b2a9a9247 ("refscale: Add measurement of clock readout"). Thanx, Paul > vim +/x +479 kernel/rcu/refscale.c > > 471 > 472 static void ref_clock_section(const int nloops) > 473 { > 474 u64 x; > 475 int i; > 476 > 477 preempt_disable(); > 478 for (i = nloops; i >= 0; i--) { > > 479 x += ktime_get_real_fast_ns(); > 480 } > 481 preempt_enable(); > 482 stopopts = x; > 483 } > 484 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
