Hi Kenta, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on tip/sched/core] [also build test WARNING on linux/master linus/master v5.12-rc8 next-20210421] [cannot apply to kvm/queue] [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/Kenta-Ishiguro/Mitigating-Excess... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 3f5ad91488e813026f8c5f46b839e91a83912703 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://github.com/0day-ci/linux/commit/b803c1316e4fd9a6781869b66566f28be... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kenta-Ishiguro/Mitigating-Excessive-Pause-Loop-Exiting-in-VM-Agnostic-KVM/20210421-234914 git checkout b803c1316e4fd9a6781869b66566f28bef3c97f4 # 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(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) kernel/sched/fair.c:876:34: 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:876:34: sparse: expected struct sched_entity *se kernel/sched/fair.c:876:34: sparse: got struct sched_entity [noderef] __rcu * kernel/sched/fair.c:10662:9: 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:10662:9: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:10662:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:4931:22: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/fair.c:4931:22: sparse: struct task_struct [noderef] __rcu * kernel/sched/fair.c:4931:22: sparse: struct task_struct * kernel/sched/fair.c:5454:38: 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:5454:38: sparse: expected struct task_struct *curr kernel/sched/fair.c:5454:38: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:6680:20: 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:6680:20: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:6680:20: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:6802:9: 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:6802:9: sparse: expected struct sched_domain *[assigned] tmp kernel/sched/fair.c:6802:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:7000:38: 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:7000:38: sparse: expected struct task_struct *curr kernel/sched/fair.c:7000:38: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:7251:38: 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:7251:38: sparse: expected struct task_struct *curr kernel/sched/fair.c:7251:38: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:7318:14: sparse: expected struct task_struct *curr kernel/sched/fair.c:7318:14: sparse: got struct task_struct [noderef] __rcu *curr kernel/sched/fair.c:8276:40: 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:8276:40: sparse: expected struct sched_domain *child kernel/sched/fair.c:8276:40: sparse: got struct sched_domain [noderef] __rcu *child kernel/sched/fair.c:8724:22: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/fair.c:8724:22: sparse: struct task_struct [noderef] __rcu * kernel/sched/fair.c:8724:22: sparse: struct task_struct * kernel/sched/fair.c:9984:9: 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:9984:9: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:9984:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:9643:44: 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:9643:44: sparse: expected struct sched_domain *sd_parent kernel/sched/fair.c:9643:44: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:10056:9: 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:10056:9: sparse: expected struct sched_domain *[assigned] sd kernel/sched/fair.c:10056:9: sparse: got struct sched_domain [noderef] __rcu *parent kernel/sched/fair.c:4599:31: sparse: sparse: marked inline, but without a definition kernel/sched/fair.c: note: in included file: kernel/sched/sched.h:1729:25: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1729:25: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1729:25: sparse: struct task_struct * kernel/sched/sched.h:1884:9: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1884:9: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1884:9: sparse: struct task_struct * kernel/sched/sched.h:1729:25: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1729:25: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1729:25: sparse: struct task_struct * kernel/sched/sched.h:1729:25: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/sched/sched.h:1729:25: sparse: struct task_struct [noderef] __rcu * kernel/sched/sched.h:1729:25: sparse: struct task_struct * vim +7318 kernel/sched/fair.c 7304 7305 static bool yield_to_task_fair(struct rq *rq, struct task_struct *p) 7306 { 7307 struct sched_entity *se = &p->se; 7308 struct task_struct *curr; 7309 struct sched_entity *yield_se; 7310 7311 /* throttled hierarchies are not runnable */ 7312 if (!se->on_rq || throttled_hierarchy(cfs_rq_of(se))) 7313 return false; 7314 7315 /* Tell the scheduler that we'd really like pse to run next. */ 7316 set_next_buddy(se); 7317 7319 yield_se = &curr->se; 7320 deboost_yield_task(se, yield_se); 7321 7322 yield_task_fair(rq); 7323 7324 return true; 7325 } 7326 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org