[PATCH RESEND bpf-next 01/18] bpf: introduce BPF token object

[kernel test robot]

Hi Andrii,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Andrii-Nakryiko/bpf-introduce-BPF-token-object/20230602-230448
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20230602150011.1657856-2-andrii%40kernel.org
patch subject: [PATCH RESEND bpf-next 01/18] bpf: introduce BPF token object
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20230603/202306030138.u9AeNgUk-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/59e6ef2000a056ce3386db8481e477e5abfbbe15
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Andrii-Nakryiko/bpf-introduce-BPF-token-object/20230602-230448
        git checkout 59e6ef2000a056ce3386db8481e477e5abfbbe15
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash kernel/ net/core/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306030138.u9AeNgUk-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/fork.c:98:
   include/linux/bpf.h: In function 'bpf_token_new_fd':
>> include/linux/bpf.h:2465:16: warning: returning 'int' from a function with return type 'struct bpf_token *' makes pointer from integer without a cast [-Wint-conversion]
    2465 |         return -EOPNOTSUPP;
         |                ^
   kernel/fork.c: At top level:
   kernel/fork.c:164:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes]
     164 | void __weak arch_release_task_struct(struct task_struct *tsk)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:991:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes]
     991 | void __init __weak arch_task_cache_init(void) { }
         |                    ^~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:1086:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes]
    1086 | int __weak arch_dup_task_struct(struct task_struct *dst,
         |            ^~~~~~~~~~~~~~~~~~~~
--
   In file included from include/linux/filter.h:9,
                    from kernel/sysctl.c:35:
   include/linux/bpf.h: In function 'bpf_token_new_fd':
>> include/linux/bpf.h:2465:16: warning: returning 'int' from a function with return type 'struct bpf_token *' makes pointer from integer without a cast [-Wint-conversion]
    2465 |         return -EOPNOTSUPP;
         |                ^
--
   In file included from include/linux/filter.h:9,
                    from kernel/kallsyms.c:25:
   include/linux/bpf.h: In function 'bpf_token_new_fd':
>> include/linux/bpf.h:2465:16: warning: returning 'int' from a function with return type 'struct bpf_token *' makes pointer from integer without a cast [-Wint-conversion]
    2465 |         return -EOPNOTSUPP;
         |                ^
   kernel/kallsyms.c: At top level:
   kernel/kallsyms.c:662:12: warning: no previous prototype for 'arch_get_kallsym' [-Wmissing-prototypes]
     662 | int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
         |            ^~~~~~~~~~~~~~~~
--
   In file included from include/linux/filter.h:9,
                    from kernel/bpf/core.c:21:
   include/linux/bpf.h: In function 'bpf_token_new_fd':
>> include/linux/bpf.h:2465:16: warning: returning 'int' from a function with return type 'struct bpf_token *' makes pointer from integer without a cast [-Wint-conversion]
    2465 |         return -EOPNOTSUPP;
         |                ^
   kernel/bpf/core.c: At top level:
   kernel/bpf/core.c:1638:12: warning: no previous prototype for 'bpf_probe_read_kernel' [-Wmissing-prototypes]
    1638 | u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
         |            ^~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/core.c:2075:6: warning: no previous prototype for 'bpf_patch_call_args' [-Wmissing-prototypes]
    2075 | void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
         |      ^~~~~~~~~~~~~~~~~~~


vim +2465 include/linux/bpf.h

  2462	
  2463	static inline struct bpf_token *bpf_token_new_fd(struct bpf_token *token)
  2464	{
> 2465		return -EOPNOTSUPP;
  2466	}
  2467	

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