tree: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-client-tip head: 57349dbe54433697c5b96bd5d8b5bd7499754d2b commit: 368e0d04d5c41fcf565feccb51c3355ae0f3090a [34/76] x86/head/64: Make fixup_pointer() static inline config: i386-tinyconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout 368e0d04d5c41fcf565feccb51c3355ae0f3090a # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the joro/sev-es-client-tip HEAD 57349dbe54433697c5b96bd5d8b5bd7499754d2b builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from arch/x86/kernel/head32.c:15: arch/x86/include/asm/setup.h: In function 'fixup_pointer': 77 | return ptr - (void *)_text + (void *)physaddr; | ^~~~~ arch/x86/include/asm/setup.h:77:23: note: each undeclared identifier is reported only once for each function it appears in arch/x86/kernel/head32.c: At top level: arch/x86/kernel/head32.c:72:13: warning: no previous prototype for 'mk_early_pgtbl_32' [-Wmissing-prototypes] 72 | void __init mk_early_pgtbl_32(void) | ^~~~~~~~~~~~~~~~~ -- In file included from arch/x86/kernel/platform-quirks.c:5: arch/x86/include/asm/setup.h: In function 'fixup_pointer': 77 | return ptr - (void *)_text + (void *)physaddr; | ^~~~~ arch/x86/include/asm/setup.h:77:23: note: each undeclared identifier is reported only once for each function it appears in vim +/_text +77 arch/x86/include/asm/setup.h 69 70 /* 71 * This function is used in C code that runs while the kernel still runs on 72 * identity mapped addresses to get the correct address of kernel pointers in 73 * the identity mapping. 74 */ 75 static __always_inline void *fixup_pointer(void *ptr, unsigned long physaddr) 76 { 78 } 79 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org