Re: [RFC bpf-next fanotify 4/5] fanotify: Enable bpf based fanotify fastpath handler

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

Hi Song,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on bpf/master]
[also build test ERROR on jack-fs/fsnotify linus/master v6.12-rc5]
[cannot apply to bpf-next/master next-20241101]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Song-Liu/fanotify-Introduce-fanotify-fastpath-handler/20241030-071530
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
patch link:    https://lore.kernel.org/r/20241029231244.2834368-5-song%40kernel.org
patch subject: [RFC bpf-next fanotify 4/5] fanotify: Enable bpf based fanotify fastpath handler
config: i386-randconfig-016-20241102 (https://download.01.org/0day-ci/archive/20241102/202411021247.TwBBZ3ZJ-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241102/202411021247.TwBBZ3ZJ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411021247.TwBBZ3ZJ-lkp@intel.com/

All errors (new ones prefixed by >>):

   fs/notify/fanotify/fanotify_fastpath.c: In function 'bpf_fanotify_fastpath_is_valid_access':
>> fs/notify/fanotify/fanotify_fastpath.c:217:14: error: implicit declaration of function 'bpf_tracing_btf_ctx_access' [-Werror=implicit-function-declaration]
     217 |         if (!bpf_tracing_btf_ctx_access(off, size, type, prog, info))
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from fs/notify/fanotify/fanotify_fastpath.c:4:
   fs/notify/fanotify/fanotify_fastpath.c: In function 'bpf_fanotify_fastpath_struct_ops_init':
   include/linux/bpf.h:1868:50: warning: statement with no effect [-Wunused-value]
    1868 | #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
         |                                                  ^~~~~~~~~~~~~~~~
   fs/notify/fanotify/fanotify_fastpath.c:315:22: note: in expansion of macro 'register_bpf_struct_ops'
     315 |         ret = ret ?: register_bpf_struct_ops(&bpf_fanotify_fastpath_ops, fanotify_fastpath_ops);
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/bpf_tracing_btf_ctx_access +217 fs/notify/fanotify/fanotify_fastpath.c

   211	
   212	static bool bpf_fanotify_fastpath_is_valid_access(int off, int size,
   213							  enum bpf_access_type type,
   214							  const struct bpf_prog *prog,
   215							  struct bpf_insn_access_aux *info)
   216	{
 > 217		if (!bpf_tracing_btf_ctx_access(off, size, type, prog, info))
   218			return false;
   219	
   220		return true;
   221	}
   222	

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