Hi Yosry, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Yosry-Ahmed/bpf-rstat-cgroup-hierarchical-stats/20220520-093041 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220521/202205211932.e4nkPC3e-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-1) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/23c4c48fb35b084dc1173c7b9d23d4e6e1a084a3 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Yosry-Ahmed/bpf-rstat-cgroup-hierarchical-stats/20220520-093041 git checkout 23c4c48fb35b084dc1173c7b9d23d4e6e1a084a3 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash kernel/cgroup/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> kernel/cgroup/rstat.c:145:22: warning: no previous prototype for 'bpf_rstat_flush' [-Wmissing-prototypes] 145 | __weak noinline void bpf_rstat_flush(struct cgroup *cgrp, | ^~~~~~~~~~~~~~~ vim +/bpf_rstat_flush +145 kernel/cgroup/rstat.c 143 144 /* A hook for bpf stat collectors to attach to and flush their stats */ > 145 __weak noinline void bpf_rstat_flush(struct cgroup *cgrp, 146 struct cgroup *parent, int cpu) 147 { 148 } 149 -- 0-DAY CI Kernel Test Service https://01.org/lkp
