From: kernel test robot <lkp@intel.com>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: kbuild-all@lists.01.org, clang-built-linux@googlegroups.com,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [linux-next:master 1888/2633] kernel/rcu/refscale.c:479:3: warning: variable 'x' is uninitialized when used here
Date: Wed, 12 May 2021 19:38:22 +0800 [thread overview]
Message-ID: <202105121916.mj2oXShS-lkp@intel.com> (raw)
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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@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
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next reply other threads:[~2021-05-12 11:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 11:38 kernel test robot [this message]
2021-05-13 17:48 ` [linux-next:master 1888/2633] kernel/rcu/refscale.c:479:3: warning: variable 'x' is uninitialized when used here Paul E. McKenney
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