linux-kernel - [ammarfaizi2-block:google/android/kernel/common/deprecated/android-4.9-p-release 8545/9999] kernel/trace/ftrace.c:5740:6: warning: no previous declaration for 'ftrace_graph_return

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Date:   Thu, 3 Mar 2022 01:45:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:google/android/kernel/common/deprecated/android-4.9-p-release
 8545/9999] kernel/trace/ftrace.c:5740:6: warning: no previous declaration
 for 'ftrace_graph_return_stub'

Hi Sami,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/deprecated/android-4.9-p-release
head:   74f5cdd2ad41ea660f18bcaf7ce3d8d3e8e88428
commit: c2f9bce9fee8e31e0500c501076f73db7791d8e9 [8545/9999] ANDROID: ftrace: fix function type mismatches
config: i386-randconfig-r014-20211122 (https://download.01.org/0day-ci/archive/20220303/202203030131.ZYcQgFC1-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/c2f9bce9fee8e31e0500c501076f73db7791d8e9
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/deprecated/android-4.9-p-release
        git checkout c2f9bce9fee8e31e0500c501076f73db7791d8e9
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/trace/

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 >>):

   In file included from include/linux/ratelimit.h:5:0,
                    from include/linux/device.h:27,
                    from include/linux/node.h:17,
                    from include/linux/cpu.h:16,
                    from include/linux/stop_machine.h:4,
                    from kernel/trace/ftrace.c:16:
   include/linux/sched.h:1260:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
    const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu);
    ^~~~~
   kernel/trace/ftrace.c:673:5: warning: no previous declaration for 'ftrace_profile_pages_init' [-Wmissing-declarations]
    int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
        ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:1200:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
    static bool __always_inline ftrace_hash_empty(struct ftrace_hash *hash)
    ^~~~~~
   kernel/trace/ftrace.c:2646:13: warning: no previous declaration for 'arch_ftrace_trampoline_free' [-Wmissing-declarations]
    void __weak arch_ftrace_trampoline_free(struct ftrace_ops *ops)
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:3268:1: warning: no previous declaration for 'arch_ftrace_trampoline_func' [-Wmissing-declarations]
    arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec)
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:3490:15: warning: no previous declaration for 'arch_ftrace_match_adjust' [-Wmissing-declarations]
    char * __weak arch_ftrace_match_adjust(char *str, const char *search)
                  ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c: In function '__enable_ftrace_function_probe':
   kernel/trace/ftrace.c:3721:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     int ret;
         ^~~
   kernel/trace/ftrace.c: At top level:
   kernel/trace/ftrace.c:5151:13: warning: no previous declaration for 'arch_ftrace_update_trampoline' [-Wmissing-declarations]
    void __weak arch_ftrace_update_trampoline(struct ftrace_ops *ops)
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:5740:6: warning: no previous declaration for 'ftrace_graph_return_stub' [-Wmissing-declarations]
    void ftrace_graph_return_stub(struct ftrace_graph_ret *trace)
         ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:5744:5: warning: no previous declaration for 'ftrace_graph_entry_stub' [-Wmissing-declarations]
    int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
        ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/ftrace.c:1080:27: warning: 'ftrace_swapper_pid' defined but not used [-Wunused-const-variable=]
    static struct pid * const ftrace_swapper_pid = &init_struct_pid;
                              ^~~~~~~~~~~~~~~~~~


vim +/ftrace_graph_return_stub +5740 kernel/trace/ftrace.c

  5739	
> 5740	void ftrace_graph_return_stub(struct ftrace_graph_ret *trace)
  5741	{
  5742	}
  5743	

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