tree: https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git isolation/split head: c4988a7256e9e02fb2503a7a0e748ab7b50667b6 commit: 8ea31dca120d4d746a70867c26ca97bb9f4b0471 [9/13] rcu/nocb: Pass a cpumask instead of a single CPU to offload/deoffload config: i386-randconfig-s001-20211027 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.g... git remote add frederic-dynticks https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git git fetch --no-tags frederic-dynticks isolation/split git checkout 8ea31dca120d4d746a70867c26ca97bb9f4b0471 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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/rcutorture.c:563:1: sparse: sparse: symbol '__srcu_struct_srcu_ctl' was not declared. Should it be static? kernel/rcu/rcutorture.c:1718:49: sparse: expected struct cpumask *cpumask kernel/rcu/rcutorture.c:1718:49: sparse: got struct cpumask const * kernel/rcu/rcutorture.c:1721:49: sparse: sparse: incorrect type in argument 1 (different modifiers) @@ expected struct cpumask *cpumask @@ got struct cpumask const * @@ kernel/rcu/rcutorture.c:1721:49: sparse: expected struct cpumask *cpumask kernel/rcu/rcutorture.c:1721:49: sparse: got struct cpumask const * kernel/rcu/rcutorture.c:785:12: sparse: sparse: context imbalance in 'rcu_torture_read_lock_trivial' - wrong count at exit kernel/rcu/rcutorture.c:793:9: sparse: sparse: context imbalance in 'rcu_torture_read_unlock_trivial' - wrong count at exit kernel/rcu/rcutorture.c:1468:9: sparse: sparse: context imbalance in 'rcutorture_one_extend' - different lock contexts for basic block vim +1718 kernel/rcu/rcutorture.c 1686 1687 /* 1688 * Randomly Toggle CPUs' callback-offload state. This uses hrtimers to 1689 * increase race probabilities and fuzzes the interval between toggling. 1690 */ 1691 static int rcu_nocb_toggle(void *arg) 1692 { 1693 int cpu; 1694 int maxcpu = -1; 1695 int oldnice = task_nice(current); 1696 long r; 1697 DEFINE_TORTURE_RANDOM(rand); 1698 ktime_t toggle_delay; 1699 unsigned long toggle_fuzz; 1700 ktime_t toggle_interval = ms_to_ktime(nocbs_toggle); 1701 1702 VERBOSE_TOROUT_STRING("rcu_nocb_toggle task started"); 1703 while (!rcu_inkernel_boot_has_ended()) 1704 schedule_timeout_interruptible(HZ / 10); 1705 for_each_online_cpu(cpu) 1706 maxcpu = cpu; 1707 WARN_ON(maxcpu < 0); 1708 if (toggle_interval > ULONG_MAX) 1709 toggle_fuzz = ULONG_MAX >> 3; 1710 else 1711 toggle_fuzz = toggle_interval >> 3; 1712 if (toggle_fuzz <= 0) 1713 toggle_fuzz = NSEC_PER_USEC; 1714 do { 1715 r = torture_random(&rand); 1716 cpu = (r >> 4) % (maxcpu + 1); 1717 if (r & 0x1) { 1719 atomic_long_inc(&n_nocb_offload); 1720 } else { 1721 rcu_nocb_cpumask_update(cpumask_of(cpu), false); 1722 atomic_long_inc(&n_nocb_deoffload); 1723 } 1724 toggle_delay = torture_random(&rand) % toggle_fuzz + toggle_interval; 1725 set_current_state(TASK_INTERRUPTIBLE); 1726 schedule_hrtimeout(&toggle_delay, HRTIMER_MODE_REL); 1727 if (stutter_wait("rcu_nocb_toggle")) 1728 sched_set_normal(current, oldnice); 1729 } while (!torture_must_stop()); 1730 torture_kthread_stopping("rcu_nocb_toggle"); 1731 return 0; 1732 } 1733 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org