tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.11.10a head: cfbd3769397911e7f1561fa57b4490b1e4fed9de commit: a3ecbdd6d841a025ebe87b79c7538b4dc44edc94 [81/96] rcu-tasks: Use spin_lock_rcu_node() and friends config: arm-randconfig-s032-20211115 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/com... git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags paulmck-rcu dev.2021.11.10a git checkout a3ecbdd6d841a025ebe87b79c7538b4dc44edc94 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) kernel/rcu/update.c: note: in included file: kernel/rcu/tasks.h:181:25: sparse: expected struct raw_spinlock [usertype] *lock kernel/rcu/tasks.h:181:25: sparse: got struct raw_spinlock [noderef] * vim +181 kernel/rcu/tasks.h 165 166 // Initialize per-CPU callback lists for the specified flavor of 167 // Tasks RCU. 168 static void cblist_init_generic(struct rcu_tasks *rtp) 169 { 170 int cpu; 171 unsigned long flags; 172 173 raw_spin_lock_irqsave(&rtp->cbs_gbl_lock, flags); 174 rtp->percpu_enqueue_shift = ilog2(nr_cpu_ids); 175 for_each_possible_cpu(cpu) { 176 struct rcu_tasks_percpu *rtpcp = per_cpu_ptr(rtp->rtpcpu, cpu); 177 178 pr_info("%s initializing CPU %d rcu_tasks_percpu structure for %s\n", __func__, cpu, rtp->name); 179 WARN_ON_ONCE(!rtpcp); 180 if (cpu) 182 raw_spin_lock_irqsave_rcu_node(rtpcp, flags); 183 if (rcu_segcblist_empty(&rtpcp->cblist)) 184 rcu_segcblist_init(&rtpcp->cblist); 185 raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags); 186 } 187 raw_spin_unlock_irqrestore(&rtp->cbs_gbl_lock, flags); 188 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org