tree: https://github.com/jimc/linux.git dd-drm-next head: 531b8210367c9d9d3430d37a12c01dced8e4354f commit: 36e19f73c31f9c5b9db4b2b4661c065a36ffc174 [2/12] dyndbg: add DEFINE_DYNAMIC_DEBUG_CATEGORIES and callbacks config: x86_64-randconfig-s032-20210821 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://github.com/jimc/linux/commit/36e19f73c31f9c5b9db4b2b4661c065a36ff... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dd-drm-next git checkout 36e19f73c31f9c5b9db4b2b4661c065a36ffc174 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/platform/pvh/ 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 >>): In file included from include/linux/acpi.h:28, from arch/x86/platform/pvh/enlighten.c:2: 232 | static inline int param_set_dyndbg(const char *instr, const struct kernel_param *kp) | ^~~~~~~~~~~~ include/linux/dynamic_debug.h:234:63: warning: 'struct kernel_param' declared inside parameter list will not be visible outside of this definition or declaration 234 | static inline int param_get_dyndbg(char *buffer, const struct kernel_param *kp) | ^~~~~~~~~~~~ arch/x86/platform/pvh/enlighten.c:39:20: warning: no previous prototype for 'mem_map_via_hcall' [-Wmissing-prototypes] 39 | void __init __weak mem_map_via_hcall(struct boot_params *ptr __maybe_unused) | ^~~~~~~~~~~~~~~~~ arch/x86/platform/pvh/enlighten.c:104:20: warning: no previous prototype for 'xen_pvh_init' [-Wmissing-prototypes] 104 | void __init __weak xen_pvh_init(struct boot_params *boot_params) | ^~~~~~~~~~~~ arch/x86/platform/pvh/enlighten.c:120:13: warning: no previous prototype for 'xen_prepare_pvh' [-Wmissing-prototypes] 120 | void __init xen_prepare_pvh(void) | ^~~~~~~~~~~~~~~ vim +232 include/linux/dynamic_debug.h 231 233 { return 0; } 234 static inline int param_get_dyndbg(char *buffer, const struct kernel_param *kp) 235 { return 0; } 236 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org