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

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Message-ID: <202512061207.7zufoIcC-lkp@intel.com>
Date: Sat, 6 Dec 2025 13:08:09 +0800
From: kernel test robot <lkp@...el.com>
To: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org
Cc: oe-kbuild-all@...ts.linux.dev, kent.overstreet@...ux.dev,
	vbabka@...e.cz, harry.yoo@...cle.com, da.gomez@...nel.org,
	jonathanh@...dia.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH 1/1] alloc_tag: skip rcu barrier on module unload if
 profiling was not enabled

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@...el.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;
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~


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