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rcu: Introduce for_each_rcu_flavor() and use it

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The arrival of TREE_PREEMPT_RCU some years back included some ugly
code involving either #ifdef or #ifdef'ed wrapper functions to iterate
over all non-SRCU flavors of RCU.  This commit therefore introduces
a for_each_rcu_flavor() iterator over the rcu_state structures for each
flavor of RCU to clean up a bit of the ugliness.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2012-06-12 11:01:13 -07:00
parent 1bca8cf1a2
commit 6ce75a2326
3 changed files with 37 additions and 144 deletions
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116
kernel/rcutree_plugin.h
View file

@ -544,16 +544,6 @@ static int rcu_print_task_stall(struct rcu_node *rnp)
return ndetected;
}
/*
* Suppress preemptible RCU's CPU stall warnings by pushing the
* time of the next stall-warning message comfortably far into the
* future.
*/
static void rcu_preempt_stall_reset(void)
{
rcu_preempt_state.jiffies_stall = jiffies + ULONG_MAX / 2;
}
/*
* Check that the list of blocked tasks for the newly completed grace
* period is in fact empty. It is a serious bug to complete a grace
@ -654,14 +644,6 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Do CPU-offline processing for preemptible RCU.
*/
static void rcu_preempt_cleanup_dead_cpu(int cpu)
{
rcu_cleanup_dead_cpu(cpu, &rcu_preempt_state);
}
/*
* 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,
@ -682,14 +664,6 @@ static void rcu_preempt_check_callbacks(int cpu)
t->rcu_read_unlock_special |= RCU_READ_UNLOCK_NEED_QS;
}
/*
* Process callbacks for preemptible RCU.
*/
static void rcu_preempt_process_callbacks(void)
{
__rcu_process_callbacks(&rcu_preempt_state);
}
#ifdef CONFIG_RCU_BOOST
static void rcu_preempt_do_callbacks(void)
@ -921,24 +895,6 @@ mb_ret:
}
EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
/*
* Check to see if there is any immediate preemptible-RCU-related work
* to be done.
*/
static int rcu_preempt_pending(int cpu)
{
return __rcu_pending(&rcu_preempt_state,
&per_cpu(rcu_preempt_data, cpu));
}
/*
* Does preemptible RCU have callbacks on this CPU?
*/
static int rcu_preempt_cpu_has_callbacks(int cpu)
{
return !!per_cpu(rcu_preempt_data, cpu).nxtlist;
}
/**
* rcu_barrier - Wait until all in-flight call_rcu() callbacks complete.
*/
@ -948,23 +904,6 @@ void rcu_barrier(void)
}
EXPORT_SYMBOL_GPL(rcu_barrier);
/*
* Initialize preemptible RCU's per-CPU data.
*/
static void __cpuinit rcu_preempt_init_percpu_data(int cpu)
{
rcu_init_percpu_data(cpu, &rcu_preempt_state, 1);
}
/*
* Move preemptible RCU's callbacks from dying CPU to other online CPU
* and record a quiescent state.
*/
static void rcu_preempt_cleanup_dying_cpu(void)
{
rcu_cleanup_dying_cpu(&rcu_preempt_state);
}
/*
* Initialize preemptible RCU's state structures.
*/
@ -1049,14 +988,6 @@ static int rcu_print_task_stall(struct rcu_node *rnp)
return 0;
}
/*
* Because preemptible RCU does not exist, there is no need to suppress
* its CPU stall warnings.
*/
static void rcu_preempt_stall_reset(void)
{
}
/*
* Because there is no preemptible RCU, there can be no readers blocked,
* so there is no need to check for blocked tasks. So check only for
@ -1084,14 +1015,6 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Because preemptible RCU does not exist, it never needs CPU-offline
* processing.
*/
static void rcu_preempt_cleanup_dead_cpu(int cpu)
{
}
/*
* Because preemptible RCU does not exist, it never has any callbacks
* to check.
@ -1100,14 +1023,6 @@ static void rcu_preempt_check_callbacks(int cpu)
{
}
/*
* Because preemptible RCU does not exist, it never has any callbacks
* to process.
*/
static void rcu_preempt_process_callbacks(void)
{
}
/*
* Queue an RCU callback for lazy invocation after a grace period.
* This will likely be later named something like "call_rcu_lazy()",
@ -1148,22 +1063,6 @@ static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
/*
* Because preemptible RCU does not exist, it never has any work to do.
*/
static int rcu_preempt_pending(int cpu)
{
return 0;
}
/*
* Because preemptible RCU does not exist, it never has callbacks
*/
static int rcu_preempt_cpu_has_callbacks(int cpu)
{
return 0;
}
/*
* Because preemptible RCU does not exist, rcu_barrier() is just
* another name for rcu_barrier_sched().
@ -1174,21 +1073,6 @@ void rcu_barrier(void)
}
EXPORT_SYMBOL_GPL(rcu_barrier);
/*
* Because preemptible RCU does not exist, there is no per-CPU
* data to initialize.
*/
static void __cpuinit rcu_preempt_init_percpu_data(int cpu)
{
}
/*
* Because there is no preemptible RCU, there is no cleanup to do.
*/
static void rcu_preempt_cleanup_dying_cpu(void)
{
}
/*
* Because preemptible RCU does not exist, it need not be initialized.
*/