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SubjectRe: [PATCH bpf-next v1 1/5] cgroup: bpf: add a hook for bpf progs to attach to rstat flushing
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@intel.com/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@intel.com>

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

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