tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/urgent head: e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2 commit: e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2 [1/1] smpboot: Mark idle_init() as __always_inlined to work around aggressive compiler un-inlining config: x86_64-randconfig-a004-20210713 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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/tip/tip.git/commit/?id=e9... git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip core/urgent git checkout e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2 # 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 inline void __always_inline idle_init(unsigned int cpu) ^ include/linux/compiler_attributes.h:65:41: note: expanded from macro '__always_inline' #define __always_inline inline __attribute__((__always_inline__)) ^ include/linux/compiler_types.h:149:16: note: expanded from macro 'inline' #define inline inline __gnu_inline __inline_maybe_unused notrace ^ 1 warning generated. vim +/inline +50 kernel/smpboot.c 43 44 /** 45 * idle_init - Initialize the idle thread for a cpu 46 * @cpu: The cpu for which the idle thread should be initialized 47 * 48 * Creates the thread if it does not exist. 49 */ 51 { 52 struct task_struct *tsk = per_cpu(idle_threads, cpu); 53 54 if (!tsk) { 55 tsk = fork_idle(cpu); 56 if (IS_ERR(tsk)) 57 pr_err("SMP: fork_idle() failed for CPU %u\n", cpu); 58 else 59 per_cpu(idle_threads, cpu) = tsk; 60 } 61 } 62 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org