Hi Alexey,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[cannot apply to lwn/docs-next linus/master v5.5-rc3 next-20191220]
[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/Alexey-Gladkov/proc-modernize-proc-to-support-multiple-private-instances/20191226-060818
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1522d9da40bdfe502c91163e6d769332897201fa
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 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 <redacted>

All warnings (new ones prefixed by >>):

   In file included from include/linux/sunrpc/stats.h:13:0,
                    from include/linux/sunrpc/clnt.h:22,
                    from include/linux/nfs_fs.h:32,
                    from init/do_mounts.c:23:
   include/linux/proc_fs.h:162:47: warning: 'struct proc_info_fs' declared inside parameter list will not be visible outside of this definition or declaration
    static inline void proc_fs_set_pid_gid(struct proc_info_fs *fs_info, kgid_t gid)
                                                  ^~~~~~~~~~~~
   include/linux/proc_fs.h: In function 'proc_fs_pidonly':

quoted

include/linux/proc_fs.h:168:9: warning: 'return' with a value, in function returning void

     return PROC_PIDONLY_OFF;
            ^~~~~~~~~~~~~~~~
   include/linux/proc_fs.h:166:20: note: declared here
    static inline void proc_fs_pidonly(struct proc_fs_info *fs_info)
                       ^~~~~~~~~~~~~~~

vim +/return +168 include/linux/proc_fs.h

   161	
 > 162	static inline void proc_fs_set_pid_gid(struct proc_info_fs *fs_info, kgid_t gid)
   163	{
   164	}
   165	
   166	static inline void proc_fs_pidonly(struct proc_fs_info *fs_info)
   167	{
 > 168		return PROC_PIDONLY_OFF;
   169	}
   170	

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