Loading kernel/rcu/tree_exp.h +11 −11 Original line number Diff line number Diff line Loading @@ -601,8 +601,8 @@ static void wait_rcu_exp_gp(struct work_struct *wp) } /* * Given an rcu_state pointer and a smp_call_function() handler, kick * off the specified flavor of expedited grace period. * Given a smp_call_function() handler, kick off the specified * implementation of expedited grace period. */ static void _synchronize_rcu_expedited(smp_call_func_t func) { Loading Loading @@ -721,7 +721,7 @@ static void sync_rcu_exp_handler(void *unused) resched_cpu(rdp->cpu); } /* PREEMPT=y, so no RCU-sched to clean up after. */ /* PREEMPT=y, so no PREEMPT=n expedited grace period to clean up after. */ static void sync_sched_exp_online_cleanup(int cpu) { } Loading Loading @@ -798,13 +798,13 @@ static void sync_sched_exp_online_cleanup(int cpu) } /* * Because a context switch is a grace period for RCU-sched, any blocking * grace-period wait automatically implies a grace period if there * is only one CPU online at any point time during execution of either * synchronize_sched() or synchronize_rcu_bh(). It is OK to occasionally * incorrectly indicate that there are multiple CPUs online when there * was in fact only one the whole time, as this just adds some overhead: * RCU still operates correctly. * Because a context switch is a grace period for !PREEMPT, any * blocking grace-period wait automatically implies a grace period if * there is only one CPU online at any point time during execution of * either synchronize_rcu() or synchronize_rcu_expedited(). It is OK to * occasionally incorrectly indicate that there are multiple CPUs online * when there was in fact only one the whole time, as this just adds some * overhead: RCU still operates correctly. */ static int rcu_blocking_is_gp(void) { Loading @@ -823,7 +823,7 @@ void synchronize_rcu_expedited(void) RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) || lock_is_held(&rcu_lock_map) || lock_is_held(&rcu_sched_lock_map), "Illegal synchronize_sched_expedited() in RCU read-side critical section"); "Illegal synchronize_rcu_expedited() in RCU read-side critical section"); /* If only one CPU, this is automatically a grace period. */ if (rcu_blocking_is_gp()) Loading Loading
kernel/rcu/tree_exp.h +11 −11 Original line number Diff line number Diff line Loading @@ -601,8 +601,8 @@ static void wait_rcu_exp_gp(struct work_struct *wp) } /* * Given an rcu_state pointer and a smp_call_function() handler, kick * off the specified flavor of expedited grace period. * Given a smp_call_function() handler, kick off the specified * implementation of expedited grace period. */ static void _synchronize_rcu_expedited(smp_call_func_t func) { Loading Loading @@ -721,7 +721,7 @@ static void sync_rcu_exp_handler(void *unused) resched_cpu(rdp->cpu); } /* PREEMPT=y, so no RCU-sched to clean up after. */ /* PREEMPT=y, so no PREEMPT=n expedited grace period to clean up after. */ static void sync_sched_exp_online_cleanup(int cpu) { } Loading Loading @@ -798,13 +798,13 @@ static void sync_sched_exp_online_cleanup(int cpu) } /* * Because a context switch is a grace period for RCU-sched, any blocking * grace-period wait automatically implies a grace period if there * is only one CPU online at any point time during execution of either * synchronize_sched() or synchronize_rcu_bh(). It is OK to occasionally * incorrectly indicate that there are multiple CPUs online when there * was in fact only one the whole time, as this just adds some overhead: * RCU still operates correctly. * Because a context switch is a grace period for !PREEMPT, any * blocking grace-period wait automatically implies a grace period if * there is only one CPU online at any point time during execution of * either synchronize_rcu() or synchronize_rcu_expedited(). It is OK to * occasionally incorrectly indicate that there are multiple CPUs online * when there was in fact only one the whole time, as this just adds some * overhead: RCU still operates correctly. */ static int rcu_blocking_is_gp(void) { Loading @@ -823,7 +823,7 @@ void synchronize_rcu_expedited(void) RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) || lock_is_held(&rcu_lock_map) || lock_is_held(&rcu_sched_lock_map), "Illegal synchronize_sched_expedited() in RCU read-side critical section"); "Illegal synchronize_rcu_expedited() in RCU read-side critical section"); /* If only one CPU, this is automatically a grace period. */ if (rcu_blocking_is_gp()) Loading
Paul E. McKenney <paulmck@linux.vnet.ibm.com>Paul E. McKenney <paulmck@linux.vnet.ibm.com>