linux-kernel - Re: [PATCH bpf-next v1 1/5] cgroup: bpf: add a hook for bpf progs to attach to rstat flushing

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Date:   Sat, 21 May 2022 19:26:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Hocko <mhocko@...nel.org>
Cc:     kbuild-all@...ts.01.org, Stanislav Fomichev <sdf@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, cgroups@...r.kernel.org,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: Re: [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: parisc-randconfig-r026-20220519 (https://download.01.org/0day-ci/archive/20220521/202205211930.7xTXJTBH-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # 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
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash kernel/cgroup/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.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