tree: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v5.16 head: 364c1c42b229912132e1615c2ce15be7154e2156 commit: 1763d5f108c2b9e4fd2e055884b8e290b75fa5f0 [9/137] x86/resctrl: Remove architecture copy of mbps_val config: i386-randconfig-m021-20220124 (https://download.01.org/0day-ci/archive/20220126/202201260259.D09DY2rL-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/commit/?i... git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git git fetch --no-tags morse mpam/snapshot/v5.16 git checkout 1763d5f108c2b9e4fd2e055884b8e290b75fa5f0 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/cpu/resctrl/ 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 >>): 400 | void setup_default_ctrlval(struct rdt_resource *r, u32 *dc) | ^~~~~~~~~~~~~~~~~~~~~ arch/x86/kernel/cpu/resctrl/core.c:414:6: warning: no previous prototype for 'domain_free' [-Wmissing-prototypes] 414 | void domain_free(struct rdt_hw_domain *hw_dom) | ^~~~~~~~~~~ vim +/setup_default_ctrlval +400 arch/x86/kernel/cpu/resctrl/core.c 399 401 { 402 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 403 int i; 404 405 /* 406 * Initialize the Control MSRs to having no control. 407 * For Cache Allocation: Set all bits in cbm 408 * For Memory Allocation: Set b/w requested to 100% 409 */ 410 for (i = 0; i < hw_res->num_closid; i++, dc++) 411 *dc = r->default_ctrl; 412 } 413 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org