tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git objtool/retpoline head: 72260c7ae8c8e1265dbd20213ce67ddfaf76df8e commit: 72260c7ae8c8e1265dbd20213ce67ddfaf76df8e [15/15] objtool,x86: Rewrite retpoline thunk calls config: x86_64-randconfig-s022-20210318 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-277-gc089cd2d-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue objtool/retpoline git checkout 72260c7ae8c8e1265dbd20213ce67ddfaf76df8e # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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 >>): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org