diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 1a4de31bd7b4d76392ed71e76a080bcdbbe20b72..fcea332a84244396072977afbb32e65a902ede05 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -62,6 +62,8 @@ extern int sched_expedited_torture_stats(char *page); /* Internal to kernel */ extern void rcu_init(void); +extern int rcu_scheduler_active; +extern void rcu_scheduler_starting(void); #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) #include @@ -140,7 +142,7 @@ static inline int rcu_read_lock_sched_held(void) if (debug_locks) lockdep_opinion = lock_is_held(&rcu_sched_lock_map); - return lockdep_opinion || preempt_count() != 0; + return lockdep_opinion || preempt_count() != 0 || !rcu_scheduler_active; } #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index 2b70d4e37383d70a0b7d099675c321b188ab7c34..a5195875480aa299d96e0649f524a184cdd88413 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -105,10 +105,6 @@ static inline void rcu_exit_nohz(void) #endif /* #else #ifdef CONFIG_NO_HZ */ -static inline void rcu_scheduler_starting(void) -{ -} - static inline void exit_rcu(void) { } diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h index 704a010f686cc637472f960b0b5cb4eb20d3b70d..42cc3a04779ee1376adce84aeb57655df656d06f 100644 --- a/include/linux/rcutree.h +++ b/include/linux/rcutree.h @@ -35,7 +35,6 @@ struct notifier_block; extern void rcu_sched_qs(int cpu); extern void rcu_bh_qs(int cpu); extern int rcu_needs_cpu(int cpu); -extern void rcu_scheduler_starting(void); extern int rcu_expedited_torture_stats(char *page); #ifdef CONFIG_TREE_PREEMPT_RCU diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index 033cb55c26df50fae2542785bd82c1071eeb65a6..7bfa004572b1c25ba16871f3761387d11221931a 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -44,6 +44,7 @@ #include #include #include +#include #ifdef CONFIG_DEBUG_LOCK_ALLOC static struct lock_class_key rcu_lock_key; @@ -62,6 +63,23 @@ struct lockdep_map rcu_sched_lock_map = EXPORT_SYMBOL_GPL(rcu_sched_lock_map); #endif +int rcu_scheduler_active __read_mostly; + +/* + * This function is invoked towards the end of the scheduler's initialization + * process. Before this is called, the idle task might contain + * RCU read-side critical sections (during which time, this idle + * task is booting the system). After this function is called, the + * idle tasks are prohibited from containing RCU read-side critical + * sections. + */ +void rcu_scheduler_starting(void) +{ + WARN_ON(num_online_cpus() != 1); + WARN_ON(nr_context_switches() > 0); + rcu_scheduler_active = 1; +} + /* * Awaken the corresponding synchronize_rcu() instance now that a * grace period has elapsed. diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 525d3981061625bf2fc0d1d406a4e8e982967af8..335bfe4f0076b5cfc8be8de1108cf3f3fad0001b 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -46,7 +46,6 @@ #include #include #include -#include #include "rcutree.h" @@ -81,9 +80,6 @@ DEFINE_PER_CPU(struct rcu_data, rcu_sched_data); struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state); DEFINE_PER_CPU(struct rcu_data, rcu_bh_data); -static int rcu_scheduler_active __read_mostly; - - /* * Return true if an RCU grace period is in progress. The ACCESS_ONCE()s * permit this function to be invoked without holding the root rcu_node @@ -1565,21 +1561,6 @@ static int rcu_needs_cpu_quick_check(int cpu) rcu_preempt_needs_cpu(cpu); } -/* - * This function is invoked towards the end of the scheduler's initialization - * process. Before this is called, the idle task might contain - * RCU read-side critical sections (during which time, this idle - * task is booting the system). After this function is called, the - * idle tasks are prohibited from containing RCU read-side critical - * sections. - */ -void rcu_scheduler_starting(void) -{ - WARN_ON(num_online_cpus() != 1); - WARN_ON(nr_context_switches() > 0); - rcu_scheduler_active = 1; -} - static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL}; static atomic_t rcu_barrier_cpu_count; static DEFINE_MUTEX(rcu_barrier_mutex);