tree: https://github.com/zen-kernel/zen-kernel 5.15/prjc head: 88afbbeeefd1e9ceca6efea72562fca5fc546daf commit: 5f4249233a80dbfc638ec1eaa9b68f1039399f66 [199/239] sched/alt: [Sync] 2f064a59a11f sched: Change task_struct::state config: i386-randconfig-a005-20211118 (attached as .config) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/zen-kernel/zen-kernel/commit/5f4249233a80dbfc638ec1eaa... git remote add zen https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen 5.15/prjc git checkout 5f4249233a80dbfc638ec1eaa9b68f1039399f66 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): void resched_curr(struct rq *rq) ^ kernel/sched/alt_core.c:830:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void resched_curr(struct rq *rq) ^ static kernel/sched/alt_core.c:853:6: warning: no previous prototype for function 'resched_cpu' [-Wmissing-prototypes] void resched_cpu(int cpu) ^ kernel/sched/alt_core.c:853:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void resched_cpu(int cpu) ^ static kernel/sched/alt_core.c:1053:6: warning: no previous prototype for function 'hrtick_start' [-Wmissing-prototypes] void hrtick_start(struct rq *rq, u64 delay) ^ kernel/sched/alt_core.c:1053:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void hrtick_start(struct rq *rq, u64 delay) ^ static kernel/sched/alt_core.c:1744:6: warning: no previous prototype for function 'sched_set_stop_task' [-Wmissing-prototypes] void sched_set_stop_task(int cpu, struct task_struct *stop) ^ kernel/sched/alt_core.c:1744:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_set_stop_task(int cpu, struct task_struct *stop) ^ static kernel/sched/alt_core.c:6229:6: warning: no previous prototype for function 'idle_task_exit' [-Wmissing-prototypes] void idle_task_exit(void) ^ kernel/sched/alt_core.c:6229:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void idle_task_exit(void) ^ static kernel/sched/alt_core.c:6439:5: warning: no previous prototype for function 'sched_cpu_activate' [-Wmissing-prototypes] int sched_cpu_activate(unsigned int cpu) ^ kernel/sched/alt_core.c:6439:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_cpu_activate(unsigned int cpu) ^ static kernel/sched/alt_core.c:6478:5: warning: no previous prototype for function 'sched_cpu_deactivate' [-Wmissing-prototypes] int sched_cpu_deactivate(unsigned int cpu) ^ kernel/sched/alt_core.c:6478:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_cpu_deactivate(unsigned int cpu) ^ static kernel/sched/alt_core.c:6542:5: warning: no previous prototype for function 'sched_cpu_starting' [-Wmissing-prototypes] int sched_cpu_starting(unsigned int cpu) ^ kernel/sched/alt_core.c:6542:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_cpu_starting(unsigned int cpu) ^ static kernel/sched/alt_core.c:6562:5: warning: no previous prototype for function 'sched_cpu_wait_empty' [-Wmissing-prototypes] int sched_cpu_wait_empty(unsigned int cpu) ^ kernel/sched/alt_core.c:6562:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_cpu_wait_empty(unsigned int cpu) ^ static kernel/sched/alt_core.c:6604:5: warning: no previous prototype for function 'sched_cpu_dying' [-Wmissing-prototypes] int sched_cpu_dying(unsigned int cpu) ^ kernel/sched/alt_core.c:6604:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_cpu_dying(unsigned int cpu) ^ static kernel/sched/alt_core.c:6851:16: warning: variable 'preempt_disable_ip' set but not used [-Wunused-but-set-variable] unsigned long preempt_disable_ip; ^ kernel/sched/alt_core.c:7046:20: warning: no previous prototype for function 'sched_create_group' [-Wmissing-prototypes] struct task_group *sched_create_group(struct task_group *parent) ^ kernel/sched/alt_core.c:7046:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct task_group *sched_create_group(struct task_group *parent) ^ static kernel/sched/alt_core.c:7057:6: warning: no previous prototype for function 'sched_online_group' [-Wmissing-prototypes] void sched_online_group(struct task_group *tg, struct task_group *parent) ^ kernel/sched/alt_core.c:7057:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_online_group(struct task_group *tg, struct task_group *parent) ^ static kernel/sched/alt_core.c:7068:6: warning: no previous prototype for function 'sched_destroy_group' [-Wmissing-prototypes] void sched_destroy_group(struct task_group *tg) ^ kernel/sched/alt_core.c:7068:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_destroy_group(struct task_group *tg) ^ static kernel/sched/alt_core.c:7074:6: warning: no previous prototype for function 'sched_offline_group' [-Wmissing-prototypes] void sched_offline_group(struct task_group *tg) ^ kernel/sched/alt_core.c:7074:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_offline_group(struct task_group *tg) ^ static int sched_group_set_shares(struct task_group *tg, unsigned long shares) ^ kernel/sched/alt_core.c:7144:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_group_set_shares(struct task_group *tg, unsigned long shares) ^ static kernel/sched/alt_core.c:7213:20: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides] .legacy_cftypes = cpu_legacy_files, ^~~~~~~~~~~~~~~~ kernel/sched/alt_core.c:7212:20: note: previous initialization is here .legacy_cftypes = cpu_files, ^~~~~~~~~ kernel/sched/alt_core.c:1014:19: warning: unused function 'hrtick_enabled' [-Wunused-function] static inline int hrtick_enabled(struct rq *rq) ^ 18 warnings generated. vim +/sched_group_set_shares +7144 kernel/sched/alt_core.c cb06db4ef97b1e Alfred Chen 2019-08-19 7073 cb06db4ef97b1e Alfred Chen 2019-08-19 @7074 void sched_offline_group(struct task_group *tg) cb06db4ef97b1e Alfred Chen 2019-08-19 7075 { cb06db4ef97b1e Alfred Chen 2019-08-19 7076 } cb06db4ef97b1e Alfred Chen 2019-08-19 7077 cb06db4ef97b1e Alfred Chen 2019-08-19 7078 static inline struct task_group *css_tg(struct cgroup_subsys_state *css) cb06db4ef97b1e Alfred Chen 2019-08-19 7079 { cb06db4ef97b1e Alfred Chen 2019-08-19 7080 return css ? container_of(css, struct task_group, css) : NULL; cb06db4ef97b1e Alfred Chen 2019-08-19 7081 } cb06db4ef97b1e Alfred Chen 2019-08-19 7082 cb06db4ef97b1e Alfred Chen 2019-08-19 7083 static struct cgroup_subsys_state * cb06db4ef97b1e Alfred Chen 2019-08-19 7084 cpu_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) cb06db4ef97b1e Alfred Chen 2019-08-19 7085 { cb06db4ef97b1e Alfred Chen 2019-08-19 7086 struct task_group *parent = css_tg(parent_css); cb06db4ef97b1e Alfred Chen 2019-08-19 7087 struct task_group *tg; cb06db4ef97b1e Alfred Chen 2019-08-19 7088 cb06db4ef97b1e Alfred Chen 2019-08-19 7089 if (!parent) { cb06db4ef97b1e Alfred Chen 2019-08-19 7090 /* This is early initialization for the top cgroup */ cb06db4ef97b1e Alfred Chen 2019-08-19 7091 return &root_task_group.css; cb06db4ef97b1e Alfred Chen 2019-08-19 7092 } cb06db4ef97b1e Alfred Chen 2019-08-19 7093 cb06db4ef97b1e Alfred Chen 2019-08-19 7094 tg = sched_create_group(parent); cb06db4ef97b1e Alfred Chen 2019-08-19 7095 if (IS_ERR(tg)) cb06db4ef97b1e Alfred Chen 2019-08-19 7096 return ERR_PTR(-ENOMEM); cb06db4ef97b1e Alfred Chen 2019-08-19 7097 return &tg->css; cb06db4ef97b1e Alfred Chen 2019-08-19 7098 } cb06db4ef97b1e Alfred Chen 2019-08-19 7099 cb06db4ef97b1e Alfred Chen 2019-08-19 7100 /* Expose task group only after completing cgroup initialization */ cb06db4ef97b1e Alfred Chen 2019-08-19 7101 static int cpu_cgroup_css_online(struct cgroup_subsys_state *css) cb06db4ef97b1e Alfred Chen 2019-08-19 7102 { cb06db4ef97b1e Alfred Chen 2019-08-19 7103 struct task_group *tg = css_tg(css); cb06db4ef97b1e Alfred Chen 2019-08-19 7104 struct task_group *parent = css_tg(css->parent); cb06db4ef97b1e Alfred Chen 2019-08-19 7105 cb06db4ef97b1e Alfred Chen 2019-08-19 7106 if (parent) cb06db4ef97b1e Alfred Chen 2019-08-19 7107 sched_online_group(tg, parent); cb06db4ef97b1e Alfred Chen 2019-08-19 7108 return 0; cb06db4ef97b1e Alfred Chen 2019-08-19 7109 } cb06db4ef97b1e Alfred Chen 2019-08-19 7110 cb06db4ef97b1e Alfred Chen 2019-08-19 7111 static void cpu_cgroup_css_released(struct cgroup_subsys_state *css) cb06db4ef97b1e Alfred Chen 2019-08-19 7112 { cb06db4ef97b1e Alfred Chen 2019-08-19 7113 struct task_group *tg = css_tg(css); cb06db4ef97b1e Alfred Chen 2019-08-19 7114 cb06db4ef97b1e Alfred Chen 2019-08-19 7115 sched_offline_group(tg); cb06db4ef97b1e Alfred Chen 2019-08-19 7116 } cb06db4ef97b1e Alfred Chen 2019-08-19 7117 cb06db4ef97b1e Alfred Chen 2019-08-19 7118 static void cpu_cgroup_css_free(struct cgroup_subsys_state *css) cb06db4ef97b1e Alfred Chen 2019-08-19 7119 { cb06db4ef97b1e Alfred Chen 2019-08-19 7120 struct task_group *tg = css_tg(css); cb06db4ef97b1e Alfred Chen 2019-08-19 7121 cb06db4ef97b1e Alfred Chen 2019-08-19 7122 /* cb06db4ef97b1e Alfred Chen 2019-08-19 7123 * Relies on the RCU grace period between css_released() and this. cb06db4ef97b1e Alfred Chen 2019-08-19 7124 */ cb06db4ef97b1e Alfred Chen 2019-08-19 7125 sched_free_group(tg); cb06db4ef97b1e Alfred Chen 2019-08-19 7126 } cb06db4ef97b1e Alfred Chen 2019-08-19 7127 cb06db4ef97b1e Alfred Chen 2019-08-19 7128 static void cpu_cgroup_fork(struct task_struct *task) cb06db4ef97b1e Alfred Chen 2019-08-19 7129 { cb06db4ef97b1e Alfred Chen 2019-08-19 7130 } cb06db4ef97b1e Alfred Chen 2019-08-19 7131 cb06db4ef97b1e Alfred Chen 2019-08-19 7132 static int cpu_cgroup_can_attach(struct cgroup_taskset *tset) cb06db4ef97b1e Alfred Chen 2019-08-19 7133 { cb06db4ef97b1e Alfred Chen 2019-08-19 7134 return 0; cb06db4ef97b1e Alfred Chen 2019-08-19 7135 } cb06db4ef97b1e Alfred Chen 2019-08-19 7136 cb06db4ef97b1e Alfred Chen 2019-08-19 7137 static void cpu_cgroup_attach(struct cgroup_taskset *tset) cb06db4ef97b1e Alfred Chen 2019-08-19 7138 { cb06db4ef97b1e Alfred Chen 2019-08-19 7139 } cb06db4ef97b1e Alfred Chen 2019-08-19 7140 bc4407eb08bf3d Alfred Chen 2021-03-07 7141 #ifdef CONFIG_FAIR_GROUP_SCHED bc4407eb08bf3d Alfred Chen 2021-03-07 7142 static DEFINE_MUTEX(shares_mutex); bc4407eb08bf3d Alfred Chen 2021-03-07 7143 bc4407eb08bf3d Alfred Chen 2021-03-07 @7144 int sched_group_set_shares(struct task_group *tg, unsigned long shares) bc4407eb08bf3d Alfred Chen 2021-03-07 7145 { bc4407eb08bf3d Alfred Chen 2021-03-07 7146 /* bc4407eb08bf3d Alfred Chen 2021-03-07 7147 * We can't change the weight of the root cgroup. bc4407eb08bf3d Alfred Chen 2021-03-07 7148 */ bc4407eb08bf3d Alfred Chen 2021-03-07 7149 if (&root_task_group == tg) bc4407eb08bf3d Alfred Chen 2021-03-07 7150 return -EINVAL; bc4407eb08bf3d Alfred Chen 2021-03-07 7151 bc4407eb08bf3d Alfred Chen 2021-03-07 7152 shares = clamp(shares, scale_load(MIN_SHARES), scale_load(MAX_SHARES)); bc4407eb08bf3d Alfred Chen 2021-03-07 7153 bc4407eb08bf3d Alfred Chen 2021-03-07 7154 mutex_lock(&shares_mutex); bc4407eb08bf3d Alfred Chen 2021-03-07 7155 if (tg->shares == shares) bc4407eb08bf3d Alfred Chen 2021-03-07 7156 goto done; bc4407eb08bf3d Alfred Chen 2021-03-07 7157 bc4407eb08bf3d Alfred Chen 2021-03-07 7158 tg->shares = shares; bc4407eb08bf3d Alfred Chen 2021-03-07 7159 done: bc4407eb08bf3d Alfred Chen 2021-03-07 7160 mutex_unlock(&shares_mutex); bc4407eb08bf3d Alfred Chen 2021-03-07 7161 return 0; bc4407eb08bf3d Alfred Chen 2021-03-07 7162 } bc4407eb08bf3d Alfred Chen 2021-03-07 7163 :::::: The code at line 7144 was first introduced by commit :::::: bc4407eb08bf3d99eac4643fe36809e4f987feb2 sched/alt: Implement fake cpu.shares for CGROUP :::::: TO: Alfred Chen <cchalpha(a)gmail.com&gt; :::::: CC: Alfred Chen <cchalpha(a)gmail.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org