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Date:   Wed, 17 May 2023 00:11:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Viktor Malik <vmalik@...hat.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>
Subject: tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:271:14:
 warning: no previous prototype for 'bpf_fentry_shadow_test'

Hi Viktor,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6
commit: aa3d65de4b9004d799f97700751a86d3ebd7d5f9 bpf/selftests: Test fentry attachment to shadowed functions
date:   9 weeks ago
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aa3d65de4b9004d799f97700751a86d3ebd7d5f9
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout aa3d65de4b9004d799f97700751a86d3ebd7d5f9
        make O=/tmp/kselftest headers
        make O=/tmp/kselftest -C tools/testing/selftests

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305162331.T8PxpSye-lkp@intel.com/

All warnings (new ones prefixed by >>):

   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:32:1: warning: no previous prototype for 'bpf_testmod_test_struct_arg_1' [-Wmissing-prototypes]
      32 | bpf_testmod_test_struct_arg_1(struct bpf_testmod_struct_arg_2 a, int b, int c) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:38:1: warning: no previous prototype for 'bpf_testmod_test_struct_arg_2' [-Wmissing-prototypes]
      38 | bpf_testmod_test_struct_arg_2(int a, struct bpf_testmod_struct_arg_2 b, int c) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:44:1: warning: no previous prototype for 'bpf_testmod_test_struct_arg_3' [-Wmissing-prototypes]
      44 | bpf_testmod_test_struct_arg_3(int a, int b, struct bpf_testmod_struct_arg_2 c) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:50:1: warning: no previous prototype for 'bpf_testmod_test_struct_arg_4' [-Wmissing-prototypes]
      50 | bpf_testmod_test_struct_arg_4(struct bpf_testmod_struct_arg_1 a, int b,
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:57:1: warning: no previous prototype for 'bpf_testmod_test_struct_arg_5' [-Wmissing-prototypes]
      57 | bpf_testmod_test_struct_arg_5(void) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:63:1: warning: no previous prototype for 'bpf_testmod_test_mod_kfunc' [-Wmissing-prototypes]
      63 | bpf_testmod_test_mod_kfunc(int i)
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:68:17: warning: no previous prototype for 'bpf_iter_testmod_seq_new' [-Wmissing-prototypes]
      68 | __bpf_kfunc int bpf_iter_testmod_seq_new(struct bpf_iter_testmod_seq *it, s64 value, int cnt)
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:81:18: warning: no previous prototype for 'bpf_iter_testmod_seq_next' [-Wmissing-prototypes]
      81 | __bpf_kfunc s64 *bpf_iter_testmod_seq_next(struct bpf_iter_testmod_seq* it)
         |                  ^~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:91:18: warning: no previous prototype for 'bpf_iter_testmod_seq_destroy' [-Wmissing-prototypes]
      91 | __bpf_kfunc void bpf_iter_testmod_seq_destroy(struct bpf_iter_testmod_seq *it)
         |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:109:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_user_1' [-Wmissing-prototypes]
     109 | bpf_testmod_test_btf_type_tag_user_1(struct bpf_testmod_btf_type_tag_1 __user *arg) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:117:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_user_2' [-Wmissing-prototypes]
     117 | bpf_testmod_test_btf_type_tag_user_2(struct bpf_testmod_btf_type_tag_2 *arg) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:122:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_percpu_1' [-Wmissing-prototypes]
     122 | bpf_testmod_test_btf_type_tag_percpu_1(struct bpf_testmod_btf_type_tag_1 __percpu *arg) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:127:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_percpu_2' [-Wmissing-prototypes]
     127 | bpf_testmod_test_btf_type_tag_percpu_2(struct bpf_testmod_btf_type_tag_3 *arg) {
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:131:14: warning: no previous prototype for 'bpf_testmod_loop_test' [-Wmissing-prototypes]
     131 | noinline int bpf_testmod_loop_test(int n)
         |              ^~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:143:30: warning: no previous prototype for 'bpf_testmod_return_ptr' [-Wmissing-prototypes]
     143 | __weak noinline struct file *bpf_testmod_return_ptr(int arg)
         |                              ^~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:159:14: warning: no previous prototype for 'bpf_testmod_fentry_test1' [-Wmissing-prototypes]
     159 | noinline int bpf_testmod_fentry_test1(int a)
         |              ^~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:164:14: warning: no previous prototype for 'bpf_testmod_fentry_test2' [-Wmissing-prototypes]
     164 | noinline int bpf_testmod_fentry_test2(int a, u64 b)
         |              ^~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:169:14: warning: no previous prototype for 'bpf_testmod_fentry_test3' [-Wmissing-prototypes]
     169 | noinline int bpf_testmod_fentry_test3(char a, int b, u64 c)
         |              ^~~~~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:177:1: warning: no previous prototype for 'bpf_testmod_test_read' [-Wmissing-prototypes]
     177 | bpf_testmod_test_read(struct file *file, struct kobject *kobj,
         | ^~~~~~~~~~~~~~~~~~~~~
   tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:228:1: warning: no previous prototype for 'bpf_testmod_test_write' [-Wmissing-prototypes]
     228 | bpf_testmod_test_write(struct file *file, struct kobject *kobj,
         | ^~~~~~~~~~~~~~~~~~~~~~
>> tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:271:14: warning: no previous prototype for 'bpf_fentry_shadow_test' [-Wmissing-prototypes]
     271 | noinline int bpf_fentry_shadow_test(int a)
         |              ^~~~~~~~~~~~~~~~~~~~~~


vim +/bpf_fentry_shadow_test +271 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c

   270	
 > 271	noinline int bpf_fentry_shadow_test(int a)
   272	{
   273		return a + 2;
   274	}
   275	EXPORT_SYMBOL_GPL(bpf_fentry_shadow_test);
   276	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

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