tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 25fe90f43fa312213b653dc1f12fd2d80f855883 commit: 456bb0b97f00fe8defba155c0a4c48d951635395 [8472/9209] iommu/vt-d: Expose latency monitor data through debugfs config: x86_64-randconfig-a006-20210612 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-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 456bb0b97f00fe8defba155c0a4c48d951635395 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/iommu/intel/perf.c:16: warning: Function parameter or member 'latency_lock' not described in 'DEFINE_SPINLOCK' vim +16 drivers/iommu/intel/perf.c 55ee5e67a59a1b Lu Baolu 2021-06-10 15 55ee5e67a59a1b Lu Baolu 2021-06-10 @16 static DEFINE_SPINLOCK(latency_lock); 55ee5e67a59a1b Lu Baolu 2021-06-10 17 :::::: The code at line 16 was first introduced by commit :::::: 55ee5e67a59a1b6f388d7a1c7b24022145f47a3e iommu/vt-d: Add common code for dmar latency performance monitors :::::: TO: Lu Baolu <baolu.lu(a)linux.intel.com&gt; :::::: CC: Joerg Roedel <jroedel(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org