Hi Leonard, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on next-20210420] [also build test WARNING on v5.12-rc8] [cannot apply to linus/master v5.12-rc8 v5.12-rc7 v5.12-rc6] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Leonard-Crestez/tcp-Delay-sendin... base: 593ef1658ecf61d3619885bdbbcfffa3d1417891 config: um-randconfig-s031-20210421 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/0b2ec1d5d492384a89a499c7227c7f6a2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Leonard-Crestez/tcp-Delay-sending-non-probes-for-RFC4821-mtu-probing/20210421-182309 git checkout 0b2ec1d5d492384a89a499c7227c7f6a21f283d0 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=um If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org