Re: [RFC PATCH bpf-next 1/3] bpf: add dummy BPF STRUCT_OPS for test purpose

[kernel test robot <lkp@intel.com>]

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Hi Hou,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on bpf/master]
[also build test WARNING on v5.15-rc1 next-20210915]
[cannot apply to bpf-next/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Hou-Tao/introduce-dummy-BPF-STRUCT_OPS/20210915-112614
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
config: i386-randconfig-a016-20210916 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/3eeddb24d6b805983fd6147abf5bcaa65091ab2b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Hou-Tao/introduce-dummy-BPF-STRUCT_OPS/20210915-112614
        git checkout 3eeddb24d6b805983fd6147abf5bcaa65091ab2b
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from kernel/bpf/bpf_dummy_struct_ops.c:10:
   include/linux/bpf_dummy_ops.h:23:24: error: stray '\357' in program
      23 | struct bpf_dummy_ops {}；
         |                        ^
   include/linux/bpf_dummy_ops.h:23:25: error: stray '\274' in program
      23 | struct bpf_dummy_ops {}；
         |                         ^
   include/linux/bpf_dummy_ops.h:23:26: error: stray '\233' in program
      23 | struct bpf_dummy_ops {}；
         |                          ^
>> include/linux/bpf_dummy_ops.h:24:1: warning: 'static' is not at beginning of declaration [-Wold-style-declaration]
      24 | static inline struct bpf_dummy_ops *bpf_get_dummy_ops(void) { return NULL; }
         | ^~~~~~
>> include/linux/bpf_dummy_ops.h:24:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
   include/linux/bpf_dummy_ops.h:24:15: error: expected ';', identifier or '(' before 'struct'
      24 | static inline struct bpf_dummy_ops *bpf_get_dummy_ops(void) { return NULL; }
         |               ^~~~~~
   include/linux/bpf_dummy_ops.h:24:15: error: 'inline' in empty declaration
>> include/linux/bpf_dummy_ops.h:24:37: warning: no previous prototype for 'bpf_get_dummy_ops' [-Wmissing-prototypes]
      24 | static inline struct bpf_dummy_ops *bpf_get_dummy_ops(void) { return NULL; }
         |                                     ^~~~~~~~~~~~~~~~~
   kernel/bpf/bpf_dummy_struct_ops.c:17:23: error: redefinition of 'bpf_get_dummy_ops'
      17 | struct bpf_dummy_ops *bpf_get_dummy_ops(void)
         |                       ^~~~~~~~~~~~~~~~~
   In file included from kernel/bpf/bpf_dummy_struct_ops.c:10:
   include/linux/bpf_dummy_ops.h:24:37: note: previous definition of 'bpf_get_dummy_ops' was here
      24 | static inline struct bpf_dummy_ops *bpf_get_dummy_ops(void) { return NULL; }
         |                                     ^~~~~~~~~~~~~~~~~
   kernel/bpf/bpf_dummy_struct_ops.c: In function 'bpf_get_dummy_ops':
   kernel/bpf/bpf_dummy_struct_ops.c:23:41: error: 'struct bpf_dummy_ops' has no member named 'owner'
      23 |  if (ops && !bpf_try_module_get(ops, ops->owner))
         |                                         ^~
   kernel/bpf/bpf_dummy_struct_ops.c: At top level:
   kernel/bpf/bpf_dummy_struct_ops.c:31:6: error: redefinition of 'bpf_put_dummy_ops'
      31 | void bpf_put_dummy_ops(struct bpf_dummy_ops *ops)
         |      ^~~~~~~~~~~~~~~~~
   In file included from kernel/bpf/bpf_dummy_struct_ops.c:10:
   include/linux/bpf_dummy_ops.h:25:20: note: previous definition of 'bpf_put_dummy_ops' was here
      25 | static inline void bpf_put_dummy_ops(struct bpf_dummy_ops *ops) {}
         |                    ^~~~~~~~~~~~~~~~~
   kernel/bpf/bpf_dummy_struct_ops.c: In function 'bpf_put_dummy_ops':
   kernel/bpf/bpf_dummy_struct_ops.c:33:25: error: 'struct bpf_dummy_ops' has no member named 'owner'
      33 |  bpf_module_put(ops, ops->owner);
         |                         ^~
   In file included from <command-line>:
   kernel/bpf/bpf_dummy_struct_ops.c: In function 'bpf_dummy_ops_btf_struct_access':
   include/linux/compiler_types.h:140:35: error: invalid use of undefined type 'struct bpf_dummy_ops_state'
     140 | #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
         |                                   ^~~~~~~~~~~~~~~~~~
   include/linux/stddef.h:17:32: note: in expansion of macro '__compiler_offsetof'
      17 | #define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
         |                                ^~~~~~~~~~~~~~~~~~~
   kernel/bpf/bpf_dummy_struct_ops.c:97:7: note: in expansion of macro 'offsetof'
      97 |  case offsetof(struct bpf_dummy_ops_state, val):
         |       ^~~~~~~~
   include/linux/compiler_types.h:140:35: error: invalid use of undefined type 'struct bpf_dummy_ops_state'
     140 | #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
         |                                   ^~~~~~~~~~~~~~~~~~
   include/linux/stddef.h:17:32: note: in expansion of macro '__compiler_offsetof'
      17 | #define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
         |                                ^~~~~~~~~~~~~~~~~~~
   include/linux/stddef.h:37:3: note: in expansion of macro 'offsetof'
      37 |  (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
         |   ^~~~~~~~
   kernel/bpf/bpf_dummy_struct_ops.c:98:9: note: in expansion of macro 'offsetofend'
      98 |   end = offsetofend(struct bpf_dummy_ops_state, val);
         |         ^~~~~~~~~~~
   In file included from include/uapi/linux/posix_types.h:5,
                    from include/uapi/linux/types.h:14,
                    from include/linux/types.h:6,
                    from include/linux/limits.h:6,
                    from include/linux/kernel.h:7,
                    from kernel/bpf/bpf_dummy_struct_ops.c:5:
   include/linux/stddef.h:28:55: error: dereferencing pointer to incomplete type 'struct bpf_dummy_ops_state'
      28 | #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
         |                                                       ^~
   include/linux/stddef.h:37:28: note: in expansion of macro 'sizeof_field'
      37 |  (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
         |                            ^~~~~~~~~~~~
   kernel/bpf/bpf_dummy_struct_ops.c:98:9: note: in expansion of macro 'offsetofend'
      98 |   end = offsetofend(struct bpf_dummy_ops_state, val);
         |         ^~~~~~~~~~~


vim +/static +24 include/linux/bpf_dummy_ops.h

    19	
    20	extern struct bpf_dummy_ops *bpf_get_dummy_ops(void);
    21	extern void bpf_put_dummy_ops(struct bpf_dummy_ops *ops);
    22	#else
    23	struct bpf_dummy_ops {}；
  > 24	static inline struct bpf_dummy_ops *bpf_get_dummy_ops(void) { return NULL; }
    25	static inline void bpf_put_dummy_ops(struct bpf_dummy_ops *ops) {}
    26	#endif
    27	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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