tree: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-client-tip head: 930a5888b97023e3bc1e3ca50074356b3ce23718 commit: b92776535e948f1631735a891918ad3e43e04563 [36/75] x86/head/64: Move early exception dispatch to C code config: x86_64-rhel-7.6-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout b92776535e948f1631735a891918ad3e43e04563 # save the attached .config to linux build tree make W=1 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 errors (new ones prefixed by >>): 389 | static bool __init early_make_pgtable(unsigned long address) | ^~~~~~~~~~~~~~~~~~ In file included from arch/x86/kernel/head64.c:28: arch/x86/include/asm/setup.h:52:12: note: previous declaration of 'early_make_pgtable' was here 52 | extern int early_make_pgtable(unsigned long address); | ^~~~~~~~~~~~~~~~~~ arch/x86/kernel/head64.c:399:13: warning: no previous prototype for 'do_early_exception' [-Wmissing-prototypes] 399 | void __init do_early_exception(struct pt_regs *regs, int trapnr) | ^~~~~~~~~~~~~~~~~~ vim +/early_make_pgtable +389 arch/x86/kernel/head64.c 388 390 { 391 unsigned long physaddr = address - __PAGE_OFFSET; 392 pmdval_t pmd; 393 394 pmd = (physaddr & PMD_MASK) + early_pmd_flags; 395 396 return __early_make_pgtable(address, pmd); 397 } 398 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org