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@xxxxxxxxx> 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@xxxxxxxxx/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@xxxxxxxxx/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@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202610192356.CItNLOke-lkp@xxxxxxxxx/
> 
> 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