netdev - Re: [PATCH v2 bpf-next 4/6] bpf: implement bpf_prog replacement for an active bpf_cgroup

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Date:   Wed, 25 Mar 2020 18:28:31 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrey Ignatov <rdna@...com>
Subject: Re: [PATCH v2 bpf-next 4/6] bpf: implement bpf_prog replacement for
 an active bpf_cgroup_link

On Wed, Mar 25, 2020 at 3:58 PM kbuild test robot <lkp@...el.com> wrote:
>
> Hi Andrii,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on bpf-next/master]
> [cannot apply to bpf/master cgroup/for-next v5.6-rc7 next-20200325]
> [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/Andrii-Nakryiko/Add-support-for-cgroup-bpf_link/20200326-055942
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> config: i386-tinyconfig (attached as .config)
> compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
>    In file included from include/linux/cgroup-defs.h:22:0,
>                     from include/linux/cgroup.h:28,
>                     from include/linux/memcontrol.h:13,
>                     from include/linux/swap.h:9,
>                     from include/linux/suspend.h:5,
>                     from arch/x86/kernel/asm-offsets.c:13:
> >> include/linux/bpf-cgroup.h:380:45: warning: 'struct bpf_link' declared inside parameter list will not be visible outside of this definition or declaration
>     static inline int cgroup_bpf_replace(struct bpf_link *link,
>                                                 ^~~~~~~~
> --
>    In file included from include/linux/cgroup-defs.h:22:0,
>                     from include/linux/cgroup.h:28,
>                     from include/linux/memcontrol.h:13,
>                     from include/linux/swap.h:9,
>                     from include/linux/suspend.h:5,
>                     from arch/x86/kernel/asm-offsets.c:13:
> >> include/linux/bpf-cgroup.h:380:45: warning: 'struct bpf_link' declared inside parameter list will not be visible outside of this definition or declaration
>     static inline int cgroup_bpf_replace(struct bpf_link *link,
>                                                 ^~~~~~~~
>    20 real  6 user  8 sys  71.33% cpu   make prepare
>
> vim +380 include/linux/bpf-cgroup.h
>
>    379

It's a matter of forward declaring struct bpf_link here. Will fix in
v3, but I'll wait a bit for any feedback before updating.

>  > 380  static inline int cgroup_bpf_replace(struct bpf_link *link,
>    381                                       struct bpf_prog *old_prog,
>    382                                       struct bpf_prog *new_prog)
>    383  {
>    384          return -EINVAL;
>    385  }
>    386
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org