[josef-btrfs:blk-iolatency 1/13] include/linux/bio.h:556:55: warning: 'struct blkcg_gq' declared inside parameter list will not be visible outside of this definition or declaration

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git 
blk-iolatency
head:   657e770d4d6e3b03c3d4b96e427b30d6f766e2e2
commit: 03766852a022b0ff5f8c4b73f40ef205a36d095e [1/13] block: add bi_blkg to 
the bio for cgroups
config: x86_64-randconfig-x011-201820 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 03766852a022b0ff5f8c4b73f40ef205a36d095e
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/blkdev.h:21:0,
                    from block//partitions/check.h:3,
                    from block//partitions/check.c:22:
>> include/linux/bio.h:556:55: warning: 'struct blkcg_gq' declared inside 
>> parameter list will not be visible outside of this definition or declaration
    static int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg) { 
return 0; }
                                                          ^~~~~~~~
   include/linux/bio.h:556:12: warning: 'bio_associate_blkg' defined but not 
used [-Wunused-function]
    static int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg) { 
return 0; }
               ^~~~~~~~~~~~~~~~~~

vim +556 include/linux/bio.h

   544  
   545  #define bio_dev(bio) \
   546          disk_devt((bio)->bi_disk)
   547  
   548  #ifdef CONFIG_BLK_CGROUP
   549  int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state 
*blkcg_css);
   550  int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg);
   551  void bio_disassociate_task(struct bio *bio);
   552  void bio_clone_blkcg_association(struct bio *dst, struct bio *src);
   553  #else   /* CONFIG_BLK_CGROUP */
   554  static inline int bio_associate_blkcg(struct bio *bio,
   555                          struct cgroup_subsys_state *blkcg_css) { return 
0; }
 > 556  static int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg) { 
 > return 0; }
   557  static inline void bio_disassociate_task(struct bio *bio) { }
   558  static inline void bio_clone_blkcg_association(struct bio *dst,
   559                          struct bio *src) { }
   560  #endif  /* CONFIG_BLK_CGROUP */
   561  

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