linux-kernel - net/bpf/test_run.c:154:14: warning: no previous prototype for 'bpf_fentry

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Date:   Fri, 4 Jun 2021 15:50:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yonghong Song <yhs@...com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>
Subject: net/bpf/test_run.c:154:14: warning: no previous prototype for
 'bpf_fentry_test7'

Hi Yonghong,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f88cd3fb9df228e5ce4e13ec3dbad671ddb2146e
commit: d923021c2ce12acb50dc7086a1bf66eed82adf6a bpf: Add tests for PTR_TO_BTF_ID vs. null comparison
date:   11 months ago
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Ubuntu 6.4.0-17ubuntu1) 6.4.0 20180424
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d923021c2ce12acb50dc7086a1bf66eed82adf6a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d923021c2ce12acb50dc7086a1bf66eed82adf6a
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   net/bpf/test_run.c:120:14: warning: no previous prototype for 'bpf_fentry_test1' [-Wmissing-prototypes]
    int noinline bpf_fentry_test1(int a)
                 ^~~~~~~~~~~~~~~~
   net/bpf/test_run.c:125:14: warning: no previous prototype for 'bpf_fentry_test2' [-Wmissing-prototypes]
    int noinline bpf_fentry_test2(int a, u64 b)
                 ^~~~~~~~~~~~~~~~
   net/bpf/test_run.c:130:14: warning: no previous prototype for 'bpf_fentry_test3' [-Wmissing-prototypes]
    int noinline bpf_fentry_test3(char a, int b, u64 c)
                 ^~~~~~~~~~~~~~~~
   net/bpf/test_run.c:135:14: warning: no previous prototype for 'bpf_fentry_test4' [-Wmissing-prototypes]
    int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
                 ^~~~~~~~~~~~~~~~
   net/bpf/test_run.c:140:14: warning: no previous prototype for 'bpf_fentry_test5' [-Wmissing-prototypes]
    int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
                 ^~~~~~~~~~~~~~~~
   net/bpf/test_run.c:145:14: warning: no previous prototype for 'bpf_fentry_test6' [-Wmissing-prototypes]
    int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
                 ^~~~~~~~~~~~~~~~
>> net/bpf/test_run.c:154:14: warning: no previous prototype for 'bpf_fentry_test7' [-Wmissing-prototypes]
    int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
                 ^~~~~~~~~~~~~~~~
>> net/bpf/test_run.c:159:14: warning: no previous prototype for 'bpf_fentry_test8' [-Wmissing-prototypes]
    int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
                 ^~~~~~~~~~~~~~~~
   net/bpf/test_run.c:164:14: warning: no previous prototype for 'bpf_modify_return_test' [-Wmissing-prototypes]
    int noinline bpf_modify_return_test(int a, int *b)
                 ^~~~~~~~~~~~~~~~~~~~~~


vim +/bpf_fentry_test7 +154 net/bpf/test_run.c

   153	
 > 154	int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
   155	{
   156		return (long)arg;
   157	}
   158	
 > 159	int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
   160	{
   161		return (long)arg->a;
   162	}
   163	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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