tree: https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.10 head: 976a28295a01db618903406bd67cae53a4c29832 commit: 44b9bfcd4cdbc57889a0fecf79a6d30237f21bed [9989/9999] FROMGIT: tools/resolve_btfids: Build with host flags config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220119/202201191239.XKS6Ud9B-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/ammarfaizi2/linux-block/commit/44b9bfcd4cdbc57889a0fec... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.10 git checkout 44b9bfcd4cdbc57889a0fecf79a6d30237f21bed # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 prepare 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 >>): >> main.c:118:5: warning: no previous prototype for 'eprintf' [-Wmissing-prototypes] 118 | int eprintf(int level, int var, const char *fmt, ...) | ^~~~~~~ main.c: In function 'symbols_collect': main.c:407:7: warning: unused variable 'err' [-Wunused-variable] 407 | int err = -1; | ^~~ main.c:404:9: warning: unused variable 'tmp' [-Wunused-variable] 404 | char *tmp, *prefix; | ^~~ main.c: In function 'eprintf': >> main.c:128:9: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] 128 | return ret; | ^~~