linux-kernel - Re: [PATCH] softirq: Provide a handshake for canceling tasklets via polling on PREEMPT

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Message-ID: <202508131652.C4118cYh-lkp@intel.com>
Date: Wed, 13 Aug 2025 16:20:59 +0800
From: kernel test robot <lkp@...el.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev
Cc: oe-kbuild-all@...ts.linux.dev, Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>, Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH] softirq: Provide a handshake for canceling tasklets via
 polling on PREEMPT_RT

Hi Sebastian,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.17-rc1 next-20250813]
[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/Sebastian-Andrzej-Siewior/softirq-Provide-a-handshake-for-canceling-tasklets-via-polling-on-PREEMPT_RT/20250812-224928
base:   linus/master
patch link:    https://lore.kernel.org/r/20250812143930.22RBn5BW%40linutronix.de
patch subject: [PATCH] softirq: Provide a handshake for canceling tasklets via polling on PREEMPT_RT
config: csky-randconfig-002-20250813 (https://download.01.org/0day-ci/archive/20250813/202508131652.C4118cYh-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250813/202508131652.C4118cYh-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/202508131652.C4118cYh-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/softirq.c:853:13: warning: 'tasklet_callback_cancel_wait_running' defined but not used [-Wunused-function]
     853 | static void tasklet_callback_cancel_wait_running(void) { }
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/tasklet_callback_cancel_wait_running +853 kernel/softirq.c

   850	
   851	static void tasklet_lock_callback(void) { }
   852	static void tasklet_unlock_callback(void) { }
 > 853	static void tasklet_callback_cancel_wait_running(void) { }
   854	static void tasklet_callback_sync_wait_running(void) { }
   855	

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