tree: https://github.com/intel/tdx.git guest head: 31ae665a672fa9307b6980ee92041d6f1f1f5310 commit: ba0d282812206d4fd27dcb7aca1c3ba6f820e85a [66/107] x86/tdx: Disable kvmclock in TDX config: x86_64-randconfig-a011-20210730 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 reproduce (this is a W=1 build): # https://github.com/intel/tdx/commit/ba0d282812206d4fd27dcb7aca1c3ba6f820e85a git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx guest git checkout ba0d282812206d4fd27dcb7aca1c3ba6f820e85a # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): In file included from arch/x86/kernel/kvmclock.c:6: include/linux/protected_guest.h:31:15: error: unknown type name 'bool' 31 | static inline bool prot_guest_has(unsigned long flag) { return false; } | ^~~~ include/linux/protected_guest.h: In function 'prot_guest_has': >> include/linux/protected_guest.h:31:64: error: 'false' undeclared (first use in this function) 31 | static inline bool prot_guest_has(unsigned long flag) { return false; } | ^~~~~ include/linux/protected_guest.h:31:64: note: each undeclared identifier is reported only once for each function it appears in In file included from arch/x86/kernel/kvmclock.c:6: include/linux/protected_guest.h:31:71: error: control reaches end of non-void function [-Werror=return-type] 31 | static inline bool prot_guest_has(unsigned long flag) { return false; } | ^ cc1: some warnings being treated as errors vim +/false +31 include/linux/protected_guest.h 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 27 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 28 #ifdef CONFIG_ARCH_HAS_PROTECTED_GUEST 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 29 #include 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 30 #else 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 @31 static inline bool prot_guest_has(unsigned long flag) { return false; } 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 32 #endif 40089373e3196e Kuppuswamy Sathyanarayanan 2021-05-12 33 :::::: The code at line 31 was first introduced by commit :::::: 40089373e3196e12a4e363f3b19bb3a55898480c x86: Introduce generic protected guest abstraction :::::: TO: Kuppuswamy Sathyanarayanan :::::: CC: Kuppuswamy Sathyanarayanan --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org