tree:   https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git timers/nohz-v2
head:   4546d43a9938f6c7eec024f005cb240b8b73637b
commit: f137e27d98d0013808b4d7a86d349ef644c4cb98 [7/8] tick/nohz: Change signal tick dependency to wakeup CPUs of member tasks
config: x86_64-randconfig-s022-20210421 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git/commit/?id=f137e27d98d0013808b4d7a86d349ef644c4cb98
        git remote add dynticks https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
        git fetch --no-tags dynticks timers/nohz-v2
        git checkout f137e27d98d0013808b4d7a86d349ef644c4cb98
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> kernel/time/tick-sched.c:457:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct lockdep_map const *lock @@     got struct lockdep_map [noderef] __rcu * @@
   kernel/time/tick-sched.c:457:17: sparse:     expected struct lockdep_map const *lock
   kernel/time/tick-sched.c:457:17: sparse:     got struct lockdep_map [noderef] __rcu *

vim +457 kernel/time/tick-sched.c

   442	
   443	/*
   444	 * Set a per-taskgroup tick dependency. Posix CPU timers need this in order to elapse
   445	 * per process timers.
   446	 */
   447	void tick_nohz_dep_set_signal(struct task_struct *tsk,
   448				      enum tick_dep_bits bit)
   449	{
   450		int prev;
   451		struct signal_struct *sig = tsk->signal;
   452	
   453		prev = atomic_fetch_or(BIT(bit), &sig->tick_dep_mask);
   454		if (!prev) {
   455			struct task_struct *t;
   456	
 > 457			lockdep_assert_held(&tsk->sighand->siglock);
   458			__for_each_thread(sig, t)
   459				tick_nohz_kick_task(t);
   460		}
   461	}
   462	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org