Hi "Joel, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20200116] [cannot apply to rcu/dev linux/master linus/master v5.5-rc6 v5.5-rc5 v5.5-rc4 v5.5] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Joel-Fernandes-Google/rcuperf-Add-support-to-vary-the-slab-object-sizes/20200117-101205 base: 2747d5fdab78f43210256cd52fb2718e0b3cce74 reproduce: # apt-get install sparse # sparse version: v0.6.1-153-g47b6dfef-dirty make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> kernel/rcu/rcuperf.c:620:11: sparse: sparse: symbol 'mem_begin' was not declared. Should it be static? Please review and possibly fold the followup patch. --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation