tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cleanups head: c382986fe178d02abdfcd6f4e7b9783c2922872c commit: d37904c5b14317a2c76efec6b9e4dbcaa17380e5 [1/2] x86/headers: Fix -Wmissing-prototypes warning config: arm64-allmodconfig (attached as .config) compiler: aarch64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout d37904c5b14317a2c76efec6b9e4dbcaa17380e5 # save the attached .config to linux build tree GCC_VERSION=7.2.0 make.cross ARCH=arm64 All errors (new ones prefixed by >>): In file included from arch/arm64/kernel/setup.c:62:0: >> arch/arm64/include/asm/efi.h:102:20: error: static declaration of 'efifb_setup_from_dmi' follows non-static declaration static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) ^~~~~~~~~~~~~~~~~~~~ In file included from arch/arm64/kernel/setup.c:40:0: include/linux/efi.h:1056:13: note: previous declaration of 'efifb_setup_from_dmi' was here extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt); ^~~~~~~~~~~~~~~~~~~~ vim +/efifb_setup_from_dmi +102 arch/arm64/include/asm/efi.h 760b61d76 Ard Biesheuvel 2017-08-18 101 9822504c1 Ard Biesheuvel 2016-04-25 @102 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) 9822504c1 Ard Biesheuvel 2016-04-25 103 { 9822504c1 Ard Biesheuvel 2016-04-25 104 } 9822504c1 Ard Biesheuvel 2016-04-25 105 :::::: The code at line 102 was first introduced by commit :::::: 9822504c1fa5c557ea8776765f03fd16eb4de4c9 efifb: Enable the efi-framebuffer platform driver for ARM and arm64 :::::: TO: Ard Biesheuvel :::::: CC: Ingo Molnar --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation