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rcu: Simplify offline processing

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Move ->qsmaskinit and blkd_tasks[] manipulation to the CPU_DYING
notifier.  This simplifies the code by eliminating a potential
deadlock and by reducing the responsibilities of force_quiescent_state().
Also rename functions to make their connection to the CPU-hotplug
stages explicit.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2012-01-07 11:03:57 -08:00
committed by Paul E. McKenney
parent ae1f18e480
commit e560140008
3 changed files with 88 additions and 97 deletions
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25
kernel/rcutree_plugin.h
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@@ -618,16 +618,16 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
return retval;
}
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Do CPU-offline processing for preemptible RCU.
*/
static void rcu_preempt_offline_cpu(int cpu)
static void rcu_preempt_cleanup_dead_cpu(int cpu)
{
__rcu_offline_cpu(cpu, &rcu_preempt_state);
rcu_cleanup_dead_cpu(cpu, &rcu_preempt_state);
}
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Check for a quiescent state from the current CPU. When a task blocks,
* the task is recorded in the corresponding CPU's rcu_node structure,
@@ -912,11 +912,12 @@ static void __cpuinit rcu_preempt_init_percpu_data(int cpu)
}
/*
* Move preemptible RCU's callbacks from dying CPU to other online CPU.
* Move preemptible RCU's callbacks from dying CPU to other online CPU
* and record a quiescent state.
*/
static void rcu_preempt_send_cbs_to_online(void)
static void rcu_preempt_cleanup_dying_cpu(void)
{
rcu_send_cbs_to_online(&rcu_preempt_state);
rcu_cleanup_dying_cpu(&rcu_preempt_state);
}
/*
@@ -1052,16 +1053,16 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
return 0;
}
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Because preemptible RCU does not exist, it never needs CPU-offline
* processing.
*/
static void rcu_preempt_offline_cpu(int cpu)
static void rcu_preempt_cleanup_dead_cpu(int cpu)
{
}
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Because preemptible RCU does not exist, it never has any callbacks
* to check.
@@ -1153,9 +1154,9 @@ static void __cpuinit rcu_preempt_init_percpu_data(int cpu)
}
/*
* Because there is no preemptible RCU, there are no callbacks to move.
* Because there is no preemptible RCU, there is no cleanup to do.
*/
static void rcu_preempt_send_cbs_to_online(void)
static void rcu_preempt_cleanup_dying_cpu(void)
{
}