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@intel.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	
 > 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