Hi Sebastian, FYI, the error/warning still remains. tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.4.y head: cc7f775b27a17c98c115aaa24288aa3c5563f846 commit: 05e50eed2fd330752c9d1805680c622c0f48dbc7 [7445/14044] mm/zswap: Use local lock to protect per-CPU data config: x86_64-randconfig-a003-20210309 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 820f508b08d7c94b2dd7847e9710d2bc36d3dd45) 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 git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-rt-linux-5.4.y git checkout 05e50eed2fd330752c9d1805680c622c0f48dbc7 # 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 >>): static DEFINE_LOCAL_IRQ_LOCK(zswap_cpu_lock); ^ 1 warning generated. vim +/zswap_cpu_lock +376 mm/zswap.c 370 371 /********************************* 372 * per-cpu code 373 **********************************/ 374 static DEFINE_PER_CPU(u8 *, zswap_dstmem); 375 /* Used for zswap_dstmem and tfm */ 377 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org