Re: [PATCH 1/1] alloc_tag: skip rcu barrier on module unload if profiling was not enabled

[Suren Baghdasaryan <surenb@google.com>]

On Sat, Dec 6, 2025 at 2:08 PM kernel test robot <lkp@intel.com> wrote:
>
> Hi Suren,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on 3f43be96f919cc611dcb2a4e38dd464831f4513e]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Suren-Baghdasaryan/alloc_tag-skip-rcu-barrier-on-module-unload-if-profiling-was-not-enabled/20251205-061310
> base:   3f43be96f919cc611dcb2a4e38dd464831f4513e
> patch link:    https://lore.kernel.org/r/20251204220957.360838-1-surenb%40google.com
> patch subject: [PATCH 1/1] alloc_tag: skip rcu barrier on module unload if profiling was not enabled
> config: parisc-randconfig-002-20251206 (https://download.01.org/0day-ci/archive/20251206/202512061207.7zufoIcC-lkp@intel.com/config)
> compiler: hppa-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251206/202512061207.7zufoIcC-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/202512061207.7zufoIcC-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> >> lib/codetag.c:37:13: warning: 'flush_rcu_on_module_unload' defined but not used [-Wunused-variable]
>       37 | static bool flush_rcu_on_module_unload;
>          |             ^~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks! I'll fix it and repost after Plumbers as the original issue
seems to be resolved by Harry's patches and this optimization is not
urgent anymore.

>
>
> vim +/flush_rcu_on_module_unload +37 lib/codetag.c
>
>     34
>     35  static DEFINE_MUTEX(codetag_lock);
>     36  static LIST_HEAD(codetag_types);
>   > 37  static bool flush_rcu_on_module_unload;
>     38
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki