[krzk-github:for-next/defconfig-cleanup-io-sched-and-others-v2-rebased 2183/2430] include/linux/hugetlb_cgroup.h:146:21: warning: 'struct file_region' declared inside parameter list will not be visible outside of this definition or declaration

tree:   https://github.com/krzk/linux for-next/defconfig-cleanup-io-sched-and-others-v2-rebased
head:   819576ed2e648eb1a63ef082e7babd44fceee084
commit: 8818186983610773dc88f613b8636392efd54635 [2183/2430] hugetlb_cgroup: add accounting for shared mappings
config: m68k-m5475evb_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 8818186983610773dc88f613b8636392efd54635
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

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 mm/migrate.c:39:0:

quoted

include/linux/hugetlb_cgroup.h:146:21: warning: 'struct file_region' declared inside parameter list will not be visible outside of this definition or declaration

                 struct file_region *rg,
                        ^~~~~~~~~~~
   include/linux/hugetlb_cgroup.h:145:63: warning: 'struct resv_map' declared inside parameter list will not be visible outside of this definition or declaration
    static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
                                                                  ^~~~~~~~
   include/linux/hugetlb_cgroup.h:233:59: warning: 'struct resv_map' declared inside parameter list will not be visible outside of this definition or declaration
    static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
                                                              ^~~~~~~~

vim +146 include/linux/hugetlb_cgroup.h

   112	
   113	extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
   114						struct hugetlb_cgroup **ptr);
   115	extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
   116						     struct hugetlb_cgroup **ptr);
   117	extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
   118						 struct hugetlb_cgroup *h_cg,
   119						 struct page *page);
   120	extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
   121						      struct hugetlb_cgroup *h_cg,
   122						      struct page *page);
   123	extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
   124						 struct page *page);
   125	extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
   126						      struct page *page);
   127	
   128	extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
   129						   struct hugetlb_cgroup *h_cg);
   130	extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
   131							struct hugetlb_cgroup *h_cg);
   132	extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
   133						    unsigned long start,
   134						    unsigned long end);
   135	
   136	extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
   137							struct file_region *rg,
   138							unsigned long nr_pages);
   139	
   140	extern void hugetlb_cgroup_file_init(void) __init;
   141	extern void hugetlb_cgroup_migrate(struct page *oldhpage,
   142					   struct page *newhpage);
   143	
   144	#else
   145	static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 > 146							       struct file_region *rg,
   147							       unsigned long nr_pages)
   148	{
   149	}
   150	

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