Hi Thomas, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 84196390620ac0e5070ae36af84c137c6216a7dc commit: b83ba0b9df56f8404ccc6ebcc7050fb8294f0f20 MIPS: of: Introduce helper function to get DTB date: 7 weeks ago config: mips-randconfig-r022-20210322 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 14696baaf4c43fe53f738bc292bbe169eed93d5d) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout b83ba0b9df56f8404ccc6ebcc7050fb8294f0f20 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 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 >>): const char __section(".appended_dtb") __appended_dtb[0x100000]; ^ arch/mips/include/asm/bootinfo.h:118:13: note: previous declaration is here extern char __appended_dtb[]; ^ 1 error generated. vim +47 arch/mips/kernel/setup.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 45 87db537da4cd1b Aaro Koskinen 2015-09-11 46 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 33def8498fdde1 Joe Perches 2020-10-21 @47 const char __section(".appended_dtb") __appended_dtb[0x100000]; 87db537da4cd1b Aaro Koskinen 2015-09-11 48 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 87db537da4cd1b Aaro Koskinen 2015-09-11 49 :::::: The code at line 47 was first introduced by commit :::::: 33def8498fdde180023444b08e12b72a9efed41d treewide: Convert macro and uses of __section(foo) to __section("foo") :::::: TO: Joe Perches <joe(a)perches.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org