Hi Kumar,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Kumar-Kartikeya-Dwivedi/Introduce-unstable-CT-lookup-helpers/20211030-224748
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: arm-randconfig-r006-20211028 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d321548c3ce987f4f21350ba1c81fdb5d4354224)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/b6df0d58a8ac487b5c4c3290b9599dac88888516
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kumar-Kartikeya-Dwivedi/Introduce-unstable-CT-lookup-helpers/20211030-224748
        git checkout b6df0d58a8ac487b5c4c3290b9599dac88888516
        # 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=arm SHELL=/bin/bash kernel/bpf/

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/core.c:27:
>> include/linux/btf.h:307:1: error: expected identifier or '('
   {
   ^
   kernel/bpf/core.c:1359:12: warning: no previous prototype for function 'bpf_probe_read_kernel' [-Wmissing-prototypes]
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
              ^
   kernel/bpf/core.c:1359:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
   ^
   static 
   1 warning and 1 error generated.
--
   In file included from kernel/bpf/syscall.c:7:
   In file included from include/linux/bpf_verifier.h:8:
>> include/linux/btf.h:307:1: error: expected identifier or '('
   {
   ^
   1 error generated.


vim +307 include/linux/btf.h

   259	
   260	#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
   261	void register_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
   262				       struct kfunc_btf_id_set *s);
   263	void unregister_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
   264					 struct kfunc_btf_id_set *s);
   265	bool bpf_check_mod_kfunc_call(struct kfunc_btf_id_list *klist, u32 kfunc_id,
   266				      struct module *owner);
   267	bool bpf_is_mod_acquire_kfunc(struct kfunc_btf_id_list *klist, u32 kfunc_id,
   268				      struct module *owner);
   269	bool bpf_is_mod_release_kfunc(struct kfunc_btf_id_list *klist, u32 kfunc_id,
   270				      struct module *owner);
   271	enum bpf_return_type bpf_get_mod_kfunc_return_type(struct kfunc_btf_id_list *klist,
   272							   u32 kfunc_btf_id, struct module *owner);
   273	int bpf_btf_mod_struct_access(struct kfunc_btf_id_list *klist,
   274				      struct module *owner,
   275				      struct bpf_verifier_log *log,
   276				      const struct btf *btf,
   277				      const struct btf_type *t, int off,
   278				      int size, enum bpf_access_type atype,
   279				      u32 *next_btf_id);
   280	#else
   281	static inline void register_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
   282						     struct kfunc_btf_id_set *s)
   283	{
   284	}
   285	static inline void unregister_kfunc_btf_id_set(struct kfunc_btf_id_list *l,
   286						       struct kfunc_btf_id_set *s)
   287	{
   288	}
   289	static inline bool bpf_check_mod_kfunc_call(struct kfunc_btf_id_list *klist,
   290						    u32 kfunc_id, struct module *owner)
   291	{
   292		return false;
   293	}
   294	static inline bool bpf_is_mod_acquire_kfunc(struct kfunc_btf_id_list *klist,
   295						    u32 kfunc_id, struct module *owner)
   296	{
   297		return false;
   298	}
   299	static inline bool bpf_is_mod_release_kfunc(struct kfunc_btf_id_list *klist,
   300						    u32 kfunc_id, struct module *owner)
   301	{
   302		return false;
   303	}
   304	static inline enum bpf_return_type
   305	bpf_get_mod_kfunc_return_type(struct kfunc_btf_id_list *klist, u32 kfunc_btf_id,
   306				      struct module *owner);
 > 307	{
   308		return __BPF_RET_TYPE_MAX;
   309	}
   310	static inline int bpf_btf_mod_struct_access(struct kfunc_btf_id_list *klist,
   311						    struct module *owner,
   312						    struct bpf_verifier_log *log,
   313						    const struct btf *btf,
   314						    const struct btf_type *t, int off,
   315						    int size, enum bpf_access_type atype,
   316						    u32 *next_btf_id)
   317	{
   318		return __BPF_REG_TYPE_MAX;
   319	}
   320	#endif
   321	

---
0-DAY CI Kernel Test Service, Intel Corporation
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