tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 792c8003efc4d75b5f52db70e7380b6a425bdba8 [414/1142] xlink-pcie: XLink PCIe Remote and Local Host driver config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 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 git checkout 792c8003efc4d75b5f52db70e7380b6a425bdba8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/misc/xlink-pcie/local_host/mxlk_epf.c:104:6: error: no previous prototype for 'mxlk_register_host_irq' [-Werror=missing-prototypes] 104 | void mxlk_register_host_irq(struct mxlk *mxlk, irq_handler_t func) | ^~~~~~~~~~~~~~~~~~~~~~ drivers/misc/xlink-pcie/local_host/mxlk_epf.c:111:5: error: no previous prototype for 'mxlk_raise_irq' [-Werror=missing-prototypes] 111 | int mxlk_raise_irq(struct mxlk *mxlk, enum mxlk_doorbell_type type) | ^~~~~~~~~~~~~~ drivers/misc/xlink-pcie/local_host/mxlk_epf.c:144:5: error: no previous prototype for 'mxlk_copy_from_host_ll' [-Werror=missing-prototypes] 144 | int mxlk_copy_from_host_ll(struct mxlk *mxlk, int chan, int descs_num) | ^~~~~~~~~~~~~~~~~~~~~~ drivers/misc/xlink-pcie/local_host/mxlk_epf.c:152:5: error: no previous prototype for 'mxlk_copy_to_host_ll' [-Werror=missing-prototypes] 152 | int mxlk_copy_to_host_ll(struct mxlk *mxlk, int chan, int descs_num) | ^~~~~~~~~~~~~~~~~~~~ drivers/misc/xlink-pcie/local_host/mxlk_epf.c: In function 'epf_bind': drivers/misc/xlink-pcie/local_host/mxlk_epf.c:306:7: error: variable 'msi_capable' set but not used [-Werror=unused-but-set-variable] 306 | bool msi_capable = true; | ^~~~~~~~~~~ In file included from arch/powerpc/include/asm/paca.h:15, from arch/powerpc/include/asm/current.h:13, from include/linux/thread_info.h:21, from include/asm-generic/preempt.h:5, from ./arch/powerpc/include/generated/asm/preempt.h:1, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/stat.h:19, from include/linux/module.h:10, from drivers/misc/xlink-pcie/local_host/mxlk_epf.c:11: In function 'strncpy', inlined from 'epf_bind' at drivers/misc/xlink-pcie/local_host/mxlk_epf.c:392:2: 294 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/string.h:304:9: note: in expansion of macro '__underlying_strncpy' 304 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ In function 'strncpy', inlined from 'epf_bind' at drivers/misc/xlink-pcie/local_host/mxlk_epf.c:399:2: 294 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/string.h:304:9: note: in expansion of macro '__underlying_strncpy' 304 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors -- In file included from arch/powerpc/include/asm/paca.h:15, from arch/powerpc/include/asm/current.h:13, from include/linux/thread_info.h:21, from include/asm-generic/preempt.h:5, from ./arch/powerpc/include/generated/asm/preempt.h:1, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/stat.h:19, from include/linux/module.h:10, from drivers/misc/xlink-pcie/local_host/mxlk_inf.c:11: In function 'strncpy', inlined from 'xlink_pcie_get_device_name' at drivers/misc/xlink-pcie/local_host/mxlk_inf.c:41:2: 294 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/string.h:304:9: note: in expansion of macro '__underlying_strncpy' 304 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors # https://github.com/intel/linux-intel-lts/commit/792c8003efc4d75b5f52db70e... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout 792c8003efc4d75b5f52db70e7380b6a425bdba8 vim +/__builtin_strncpy +294 include/linux/string.h b008ae4cc74d3a Daniel Axtens 2020-06-03 272 b008ae4cc74d3a Daniel Axtens 2020-06-03 273 #ifdef CONFIG_KASAN b008ae4cc74d3a Daniel Axtens 2020-06-03 274 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr); b008ae4cc74d3a Daniel Axtens 2020-06-03 275 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp); b008ae4cc74d3a Daniel Axtens 2020-06-03 276 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy); b008ae4cc74d3a Daniel Axtens 2020-06-03 277 extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove); b008ae4cc74d3a Daniel Axtens 2020-06-03 278 extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset); b008ae4cc74d3a Daniel Axtens 2020-06-03 279 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat); b008ae4cc74d3a Daniel Axtens 2020-06-03 280 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy); b008ae4cc74d3a Daniel Axtens 2020-06-03 281 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen); b008ae4cc74d3a Daniel Axtens 2020-06-03 282 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat); b008ae4cc74d3a Daniel Axtens 2020-06-03 283 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy); b008ae4cc74d3a Daniel Axtens 2020-06-03 284 #else b008ae4cc74d3a Daniel Axtens 2020-06-03 285 #define __underlying_memchr __builtin_memchr b008ae4cc74d3a Daniel Axtens 2020-06-03 286 #define __underlying_memcmp __builtin_memcmp b008ae4cc74d3a Daniel Axtens 2020-06-03 287 #define __underlying_memcpy __builtin_memcpy b008ae4cc74d3a Daniel Axtens 2020-06-03 288 #define __underlying_memmove __builtin_memmove b008ae4cc74d3a Daniel Axtens 2020-06-03 289 #define __underlying_memset __builtin_memset b008ae4cc74d3a Daniel Axtens 2020-06-03 290 #define __underlying_strcat __builtin_strcat b008ae4cc74d3a Daniel Axtens 2020-06-03 291 #define __underlying_strcpy __builtin_strcpy b008ae4cc74d3a Daniel Axtens 2020-06-03 292 #define __underlying_strlen __builtin_strlen b008ae4cc74d3a Daniel Axtens 2020-06-03 293 #define __underlying_strncat __builtin_strncat b008ae4cc74d3a Daniel Axtens 2020-06-03 @294 #define __underlying_strncpy __builtin_strncpy b008ae4cc74d3a Daniel Axtens 2020-06-03 295 #endif b008ae4cc74d3a Daniel Axtens 2020-06-03 296 :::::: The code at line 294 was first introduced by commit :::::: b008ae4cc74d3ab43074099746f6c32d353e01aa string.h: fix incompatibility between FORTIFY_SOURCE and KASAN :::::: TO: Daniel Axtens <dja(a)axtens.net&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org