Re: tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:131:14: warning: no previous prototype for 'bpf_testmod_fentry_test1'

[Jiri Olsa <olsajiri@gmail.com>]

On Thu, Apr 06, 2023 at 07:03:39AM +0800, kernel test robot wrote:
> Hi Jiri,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   99ddf2254febae9eab7fb0bcc02c5322243f5c49
> commit: fee356ede980b6c2c8db612e18b25738356d6744 selftests/bpf: Add bpf_testmod_fentry_* functions
> date:   5 months ago
> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
> reproduce:
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fee356ede980b6c2c8db612e18b25738356d6744
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout fee356ede980b6c2c8db612e18b25738356d6744
>         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@intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202304060622.P2hBPE4g-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):

sry I can't reproduce 

it looks like bpf_testmod is not compiled by default with -Wmissing-prototypes,
when I add it I can see those warnings, but it does not seem to be enabled by
default

jirka


> 
>    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:81:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_user_1' [-Wmissing-prototypes]
>       81 | 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:89:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_user_2' [-Wmissing-prototypes]
>       89 | 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:94:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_percpu_1' [-Wmissing-prototypes]
>       94 | 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:99:1: warning: no previous prototype for 'bpf_testmod_test_btf_type_tag_percpu_2' [-Wmissing-prototypes]
>       99 | 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:103:14: warning: no previous prototype for 'bpf_testmod_loop_test' [-Wmissing-prototypes]
>      103 | noinline int bpf_testmod_loop_test(int n)
>          |              ^~~~~~~~~~~~~~~~~~~~~
>    tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:115:30: warning: no previous prototype for 'bpf_testmod_return_ptr' [-Wmissing-prototypes]
>      115 | __weak noinline struct file *bpf_testmod_return_ptr(int arg)
>          |                              ^~~~~~~~~~~~~~~~~~~~~~
> >> tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:131:14: warning: no previous prototype for 'bpf_testmod_fentry_test1' [-Wmissing-prototypes]
>      131 | noinline int bpf_testmod_fentry_test1(int a)
>          |              ^~~~~~~~~~~~~~~~~~~~~~~~
> >> tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:136:14: warning: no previous prototype for 'bpf_testmod_fentry_test2' [-Wmissing-prototypes]
>      136 | noinline int bpf_testmod_fentry_test2(int a, u64 b)
>          |              ^~~~~~~~~~~~~~~~~~~~~~~~
> >> tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:141:14: warning: no previous prototype for 'bpf_testmod_fentry_test3' [-Wmissing-prototypes]
>      141 | noinline int bpf_testmod_fentry_test3(char a, int b, u64 c)
>          |              ^~~~~~~~~~~~~~~~~~~~~~~~
>    tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:149:1: warning: no previous prototype for 'bpf_testmod_test_read' [-Wmissing-prototypes]
>      149 | bpf_testmod_test_read(struct file *file, struct kobject *kobj,
>          | ^~~~~~~~~~~~~~~~~~~~~
>    tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:200:1: warning: no previous prototype for 'bpf_testmod_test_write' [-Wmissing-prototypes]
>      200 | bpf_testmod_test_write(struct file *file, struct kobject *kobj,
>          | ^~~~~~~~~~~~~~~~~~~~~~
> 
> 
> vim +/bpf_testmod_fentry_test1 +131 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
> 
>    130	
>  > 131	noinline int bpf_testmod_fentry_test1(int a)
>    132	{
>    133		return a + 1;
>    134	}
>    135	
>  > 136	noinline int bpf_testmod_fentry_test2(int a, u64 b)
>    137	{
>    138		return a + b;
>    139	}
>    140	
>  > 141	noinline int bpf_testmod_fentry_test3(char a, int b, u64 c)
>    142	{
>    143		return a + b + c;
>    144	}
>    145	
> 
> -- 
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> https://github.com/intel/lkp-tests