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/commi...
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(a)intel.com>
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
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@lists.01.org