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 ERROR on bpf/master]
[also build test ERROR 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-buildonly-randconfig-r004-20210916 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 8cbbd7e0b2aa21ce7e416cfb63d9965518948c35)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # 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
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (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: unexpected character <U+FF1B>
   struct bpf_dummy_ops {}；
                          ^~
>> include/linux/bpf_dummy_ops.h:24:15: error: cannot combine with previous 'struct' declaration specifier
   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'
   struct bpf_dummy_ops *bpf_get_dummy_ops(void)
                         ^
   include/linux/bpf_dummy_ops.h:24:37: note: previous definition is here
   static inline struct bpf_dummy_ops *bpf_get_dummy_ops(void) { return NULL; }
                                       ^
>> kernel/bpf/bpf_dummy_struct_ops.c:23:43: error: no member named 'owner' in 'struct bpf_dummy_ops'
           if (ops && !bpf_try_module_get(ops, ops->owner))
                                               ~~~  ^
   kernel/bpf/bpf_dummy_struct_ops.c:31:6: error: redefinition of 'bpf_put_dummy_ops'
   void bpf_put_dummy_ops(struct bpf_dummy_ops *ops)
        ^
   include/linux/bpf_dummy_ops.h:25:20: note: previous definition is here
   static inline void bpf_put_dummy_ops(struct bpf_dummy_ops *ops) {}
                      ^
   kernel/bpf/bpf_dummy_struct_ops.c:33:27: error: no member named 'owner' in 'struct bpf_dummy_ops'
           bpf_module_put(ops, ops->owner);
                               ~~~  ^
>> kernel/bpf/bpf_dummy_struct_ops.c:97:7: error: offsetof of incomplete type 'struct bpf_dummy_ops_state'
           case offsetof(struct bpf_dummy_ops_state, val):
                ^        ~~~~~~
   include/linux/stddef.h:17:32: note: expanded from macro 'offsetof'
   #define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)
                                   ^                   ~~~~
   include/linux/compiler_types.h:140:35: note: expanded from macro '__compiler_offsetof'
   #define __compiler_offsetof(a, b)       __builtin_offsetof(a, b)
                                           ^                  ~
   kernel/bpf/bpf_dummy_struct_ops.c:97:23: note: forward declaration of 'struct bpf_dummy_ops_state'
           case offsetof(struct bpf_dummy_ops_state, val):
                                ^
   kernel/bpf/bpf_dummy_struct_ops.c:98:9: error: offsetof of incomplete type 'struct bpf_dummy_ops_state'
                   end = offsetofend(struct bpf_dummy_ops_state, val);
                         ^           ~~~~~~
   include/linux/stddef.h:37:3: note: expanded from macro 'offsetofend'
           (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
            ^        ~~~~
   include/linux/stddef.h:17:32: note: expanded from macro 'offsetof'
   #define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)
                                   ^                   ~~~~
   include/linux/compiler_types.h:140:35: note: expanded from macro '__compiler_offsetof'
   #define __compiler_offsetof(a, b)       __builtin_offsetof(a, b)
                                           ^                  ~
   kernel/bpf/bpf_dummy_struct_ops.c:97:23: note: forward declaration of 'struct bpf_dummy_ops_state'
           case offsetof(struct bpf_dummy_ops_state, val):
                                ^
>> kernel/bpf/bpf_dummy_struct_ops.c:98:9: error: incomplete definition of type 'struct bpf_dummy_ops_state'
                   end = offsetofend(struct bpf_dummy_ops_state, val);
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/stddef.h:37:28: note: expanded from macro 'offsetofend'
           (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/stddef.h:28:55: note: expanded from macro 'sizeof_field'
   #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
                                              ~~~~~~~~~~~^
   kernel/bpf/bpf_dummy_struct_ops.c:97:23: note: forward declaration of 'struct bpf_dummy_ops_state'
           case offsetof(struct bpf_dummy_ops_state, val):
                                ^
   9 errors generated.


vim +23 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@lists.01.org

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