CC: kbuild-all(a)lists.01.org BCC: lkp(a)intel.com CC: linux-kernel(a)vger.kernel.org TO: Arvind Sankar <nivedita(a)alum.mit.edu&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 787af64d05cd528aac9ad16752d11bb1c6061bb9 commit: 394b19d6cb58ae292c0e1ad6b893fed8ece477ce x86/boot/compressed: Use builtin mem functions for decompressor date: 1 year, 7 months ago :::::: branch date: 21 hours ago :::::: commit date: 1 year, 7 months ago config: i386-randconfig-c001 (https://download.01.org/0day-ci/archive/20220401/202204010318.cvt0HPzm-lk...) compiler: gcc-11 (Debian 11.2.0-19) 11.2.0 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 # 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 394b19d6cb58ae292c0e1ad6b893fed8ece477ce # save the config file to linux build tree If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from arch/x86/boot/compressed/misc.c:18: In function 'parse_elf', inlined from 'extract_kernel' at arch/x86/boot/compressed/misc.c:442:2: 15 | #define memcpy(d,s,l) __builtin_memcpy(d,s,l) | ^~~~~~~~~~~~~~~~~~~~~~~ arch/x86/boot/compressed/misc.c:283:9: note: in expansion of macro 'memcpy' 283 | memcpy(&ehdr, output, sizeof(ehdr)); | ^~~~~~ vim +/__builtin_memcpy +15 arch/x86/boot/compressed/../string.h c041b5ad8640dd Vivek Goyal 2014-03-18 13 394b19d6cb58ae Arvind Sankar 2020-08-04 14 /* Access builtin version by default. */ c041b5ad8640dd Vivek Goyal 2014-03-18 @15 #define memcpy(d,s,l) __builtin_memcpy(d,s,l) c041b5ad8640dd Vivek Goyal 2014-03-18 16 #define memset(d,c,l) __builtin_memset(d,c,l) fb4cac573ef6dc Vivek Goyal 2014-03-18 17 #define memcmp __builtin_memcmp c041b5ad8640dd Vivek Goyal 2014-03-18 18 :::::: The code at line 15 was first introduced by commit :::::: c041b5ad8640dd89ccf1411cd2636ef7c1cfee92 x86, boot: Create a separate string.h file to provide standard string functions :::::: TO: Vivek Goyal <vgoyal(a)redhat.com&gt; :::::: CC: H. Peter Anvin <hpa(a)linux.intel.com&gt; -- 0-DAY CI Kernel Test Service https://01.org/lkp