Re: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output

Re: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output

[kernel test robot]

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v7.3]
[cannot apply to next-20261016 next-20261016]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/kallsyms-scripts-kallsyms-c-Avoid-overrunning-on-stack-buffer/20261018-165152
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20261018155206.132411-4-david.laight.linux%40gmail.com
patch subject: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output
config: nios2-randconfig-1000-20261019 (https://download.01.org/0day-ci/archive/20261019/202610192356.CItNLOke-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261019/202610192356.CItNLOke-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610192356.CItNLOke-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/kallsyms_selftest.c:70:1: warning: 'The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun' defined but not used [-Wunused-variable]
      70 | The_time_has_come_the_Walrus_said_To_talk_of_many_things\
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      71 | _Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      72 | _And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      73 | \
         | ~
      74 | _O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      75 | _Shall_we_be_trotting_home_again_But_answer_came_there_none\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      76 | _And_this_was_scarcely_odd_because_Theyd_eaten_every_one\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      77 | \
         | ~
      78 | _The_moon_was_shining_sulkily_Because_she_thought_the_sun\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      79 | _Had_got_no_business_to_be_there_After_the_day_was_done\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      80 | _Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/kallsyms_selftest.c:70:1: note: in definition of macro 'kallsyms_very_long_name'
      70 | The_time_has_come_the_Walrus_said_To_talk_of_many_things\
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      71 | _Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      72 | _And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      73 | \
         | ~
      74 | _O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      75 | _Shall_we_be_trotting_home_again_But_answer_came_there_none\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      76 | _And_this_was_scarcely_odd_because_Theyd_eaten_every_one\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      77 | \
         | ~
      78 | _The_moon_was_shining_sulkily_Because_she_thought_the_sun\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      79 | _Had_got_no_business_to_be_there_After_the_day_was_done\
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      80 | _Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun +70 kernel/kallsyms_selftest.c

    67	
    68	/* This is 509 characters, compresses to about 330 */
    69	#define kallsyms_very_long_name \
  > 70	The_time_has_come_the_Walrus_said_To_talk_of_many_things\
    71	_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings\
    72	_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings\
    73	\
    74	_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run\
    75	_Shall_we_be_trotting_home_again_But_answer_came_there_none\
    76	_And_this_was_scarcely_odd_because_Theyd_eaten_every_one\
    77	\
    78	_The_moon_was_shining_sulkily_Because_she_thought_the_sun\
    79	_Had_got_no_business_to_be_there_After_the_day_was_done\
    80	_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun
    81	

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

Re: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output

[David Laight]

On Tue, 20 Oct 2026 00:07:48 +0800
kernel test robot <lkp@intel.com> wrote:

> Hi David,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on akpm-mm/mm-everything]
> [also build test WARNING on linus/master v7.3]
> [cannot apply to next-20261016 next-20261016]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/kallsyms-scripts-kallsyms-c-Avoid-overrunning-on-stack-buffer/20261018-165152
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20261018155206.132411-4-david.laight.linux%40gmail.com
> patch subject: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output
> config: nios2-randconfig-1000-20261019 (https://download.01.org/0day-ci/archive/20261019/202610192356.CItNLOke-lkp@intel.com/config)
> compiler: nios2-linux-gcc (GCC) 10.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261019/202610192356.CItNLOke-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202610192356.CItNLOke-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> kernel/kallsyms_selftest.c:70:1: warning: 'The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun' defined but not used [-Wunused-variable]  
...

Already noted, it depends on the build options.
I'll use the same 'trick' as done for the other static symbols
(that is reference it from a non-static function).

David

Re: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output

[kernel test robot]

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v7.3]
[cannot apply to next-20261016 next-20261016]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/kallsyms-scripts-kallsyms-c-Avoid-overrunning-on-stack-buffer/20261018-165152
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20261018155206.132411-4-david.laight.linux%40gmail.com
patch subject: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output
config: arm64-randconfig-1000-20261019 (https://download.01.org/0day-ci/archive/20261020/202610200434.qSHPOyDo-lkp@intel.com/config)
compiler: clang version 21.1.8 (https://github.com/llvm/llvm-project 2078da43e25a4623cab2d0d60decddf709aaea28)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261020/202610200434.qSHPOyDo-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610200434.qSHPOyDo-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/kallsyms_selftest.c:82:12: warning: unused variable 'The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun' [-Wunused-variable]
      82 | static int kallsyms_very_long_name = 1;
         |            ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/kallsyms_selftest.c:69:33: note: expanded from macro 'kallsyms_very_long_name'
      69 | #define kallsyms_very_long_name \
         |                                 ^
   1 warning generated.


vim +/The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun +82 kernel/kallsyms_selftest.c

    81	
  > 82	static int kallsyms_very_long_name = 1;
    83	

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

Re: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output

[David Laight]

On Tue, 20 Oct 2026 04:57:54 +0800
kernel test robot <lkp@intel.com> wrote:

> Hi David,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on akpm-mm/mm-everything]
> [also build test WARNING on linus/master v7.3]
> [cannot apply to next-20261016 next-20261016]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/kallsyms-scripts-kallsyms-c-Avoid-overrunning-on-stack-buffer/20261018-165152
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20261018155206.132411-4-david.laight.linux%40gmail.com
> patch subject: [PATCH v2 next 03/15] kallsyms: Improve selftest test_perf_kallsyms_lookup_name() output
> config: arm64-randconfig-1000-20261019 (https://download.01.org/0day-ci/archive/20261020/202610200434.qSHPOyDo-lkp@intel.com/config)
> compiler: clang version 21.1.8 (https://github.com/llvm/llvm-project 2078da43e25a4623cab2d0d60decddf709aaea28)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261020/202610200434.qSHPOyDo-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202610200434.qSHPOyDo-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> kernel/kallsyms_selftest.c:82:12: warning: unused variable 'The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun' [-Wunused-variable]  
>       82 | static int kallsyms_very_long_name = 1;
>          |            ^~~~~~~~~~~~~~~~~~~~~~~
>    kernel/kallsyms_selftest.c:69:33: note: expanded from macro 'kallsyms_very_long_name'
>       69 | #define kallsyms_very_long_name \
>          |                                 ^
>    1 warning generated.

Duplicate, depends on config options.

David

> 
> 
> vim +/The_time_has_come_the_Walrus_said_To_talk_of_many_things_Of_shoes_and_ships_and_sealing_wax_Of_cabbages_and_kings_And_why_the_sea_is_boiling_hot_And_whether_pigs_have_wings_O_Oysters_said_the_Carpenter_Youve_had_a_pleasant_run_Shall_we_be_trotting_home_again_But_answer_came_there_none_And_this_was_scarcely_odd_because_Theyd_eaten_every_one_The_moon_was_shining_sulkily_Because_she_thought_the_sun_Had_got_no_business_to_be_there_After_the_day_was_done_Its_very_rude_of_him_she_said_To_come_and_spoil_the_fun +82 kernel/kallsyms_selftest.c
> 
>     81	
>   > 82	static int kallsyms_very_long_name = 1;  
>     83	
> 
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki