Hi Aubrey, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/sched/core] [also build test WARNING on tip/master linux/master linus/master v5.12-rc2 next-20210309] [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] url: https://github.com/0day-ci/linux/commits/Aubrey-Li/sched-fair-select-idle... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 4117cebf1a9fcbf35b9aabf0e37b6c5eea296798 config: arm64-randconfig-s032-20210309 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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: v0.6.3-262-g5e674421-dirty # https://github.com/0day-ci/linux/commit/ca52510778e4c6e588e21b63cd407cda1... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Aubrey-Li/sched-fair-select-idle-cpu-from-idle-cpumask-for-task-wakeup/20210310-100644 git checkout ca52510778e4c6e588e21b63cd407cda130494f7 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 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/sched/fair.c:861:34: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_entity *se @@ got struct sched_entity [noderef] __rcu * @@ kernel/sched/fair.c:861:34: sparse: expected struct sched_entity *se kernel/sched/fair.c:861:34: sparse: got struct sched_entity [noderef] __rcu * kernel/sched/fair.c:10638:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@ kernel/sched/fair.c:10638:9: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:10638:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:5439:38: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu *curr @@ kernel/sched/fair.c:5439:38: sparse: expected struct task_struct *curr kernel/sched/fair.c:5439:38: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:5673:1: sparse: sparse: symbol '__pcpu_scope_load_balance_mask' was not declared. Should it be static? kernel/sched/fair.c:5674:1: sparse: sparse: symbol '__pcpu_scope_select_idle_mask' was not declared. Should it be static? kernel/sched/fair.c:6637:20: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@ kernel/sched/fair.c:6637:20: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:6637:20: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:6759:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] tmp @@ got struct sched_domain [noderef] __rcu *parent @@ kernel/sched/fair.c:6759:9: sparse: expected struct sched_domain *[assigned] tmp kernel/sched/fair.c:6759:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:6898:12: sparse: expected struct sched_domain *sd kernel/sched/fair.c:6898:12: sparse: got struct sched_domain [noderef] __rcu * kernel/sched/fair.c:6995:38: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu *curr @@ kernel/sched/fair.c:6995:38: sparse: expected struct task_struct *curr kernel/sched/fair.c:6995:38: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:7246:38: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu *curr @@ kernel/sched/fair.c:7246:38: sparse: expected struct task_struct *curr kernel/sched/fair.c:7246:38: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:8219:40: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *child @@ got struct sched_domain [noderef] __rcu *child @@ kernel/sched/fair.c:8219:40: sparse: expected struct sched_domain *child kernel/sched/fair.c:8219:40: sparse: got struct sched_domain [noderef] __rcu *child kernel/sched/fair.c:8709:22: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/fair.c:8709:22: sparse: struct task_struct [noderef] __rcu * kernel/sched/fair.c:8709:22: sparse: struct task_struct * kernel/sched/fair.c:9972:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@ kernel/sched/fair.c:9972:9: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:9972:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:9628:44: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *sd_parent @@ got struct sched_domain [noderef] __rcu *parent @@ kernel/sched/fair.c:9628:44: sparse: expected struct sched_domain *sd_parent kernel/sched/fair.c:9628:44: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:10050:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@ kernel/sched/fair.c:10050:9: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:10050:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:5368:35: sparse: sparse: marked inline, but without a definition kernel/sched/fair.c: note: in included file: kernel/sched/sched.h:1735:25: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1735:25: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1735:25: sparse: struct task_struct * kernel/sched/sched.h:1890:9: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1890:9: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1890:9: sparse: struct task_struct * kernel/sched/sched.h:1735:25: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1735:25: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1735:25: sparse: struct task_struct * kernel/sched/sched.h:1735:25: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1735:25: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1735:25: sparse: struct task_struct * vim +6898 kernel/sched/fair.c 6871 6872 /* 6873 * Update cpu idle state and record this information 6874 * in sd_llc_shared->idle_cpus_span. 6875 * 6876 * This function is called with interrupts disabled. 6877 */ 6878 void update_idle_cpumask(int cpu, bool idle) 6879 { 6880 struct sched_domain *sd; 6881 struct rq *rq = cpu_rq(cpu); 6882 int idle_state; 6883 6884 /* 6885 * Also set SCHED_IDLE cpu in idle cpumask to 6886 * allow SCHED_IDLE cpu as a wakeup target. 6887 */ 6888 idle_state = idle || sched_idle_cpu(cpu); 6889 /* 6890 * No need to update idle cpumask if the state 6891 * does not change. 6892 */ 6893 if (rq->last_idle_state == idle_state) 6894 return; 6895 /* 6896 * Called with irq disabled, rcu protection is not needed. 6897 */ 6899 if (unlikely(!sd)) 6900 return; 6901 6902 if (idle_state) 6903 cpumask_set_cpu(cpu, sds_idle_cpus(sd->shared)); 6904 else 6905 cpumask_clear_cpu(cpu, sds_idle_cpus(sd->shared)); 6906 6907 rq->last_idle_state = idle_state; 6908 } 6909 #endif /* CONFIG_SMP */ 6910 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org