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rcu: Remove #ifdef CONFIG_SMP from TREE_RCU 

Now that both TINY_RCU and TINY_PREEMPT_RCU have been in place for awhile,
it is time to remove UP support from TREE_RCU, which is what this commit
does.

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 2012-01-12 19:35:08 -08:00 committed by Paul E. McKenney
parent 5e1ee6e101
commit 27565d64a4
2 changed files with 0 additions and 31 deletions
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19
kernel/rcutree.c
View File

@ -301,8 +301,6 @@ static struct rcu_node *rcu_get_root(struct rcu_state *rsp)
return &rsp->node[0];
}
#ifdef CONFIG_SMP
/*
* If the specified CPU is offline, tell the caller that it is in
* a quiescent state. Otherwise, whack it with a reschedule IPI.
@ -339,8 +337,6 @@ static int rcu_implicit_offline_qs(struct rcu_data *rdp)
return 0;
}
#endif /* #ifdef CONFIG_SMP */
/*
* rcu_idle_enter_common - inform RCU that current CPU is moving towards idle
*
@ -606,8 +602,6 @@ int rcu_is_cpu_rrupt_from_idle(void)
return __get_cpu_var(rcu_dynticks).dynticks_nesting <= 1;
}
#ifdef CONFIG_SMP
/*
* Snapshot the specified CPU's dynticks counter so that we can later
* credit them with an implicit quiescent state. Return 1 if this CPU
@ -651,8 +645,6 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
return rcu_implicit_offline_qs(rdp);
}
#endif /* #ifdef CONFIG_SMP */
static void record_gp_stall_check_time(struct rcu_state *rsp)
{
rsp->gp_start = jiffies;
@ -1517,8 +1509,6 @@ void rcu_check_callbacks(int cpu, int user)
trace_rcu_utilization("End scheduler-tick");
}
#ifdef CONFIG_SMP
/*
* Scan the leaf rcu_node structures, processing dyntick state for any that
* have not yet encountered a quiescent state, using the function specified.
@ -1641,15 +1631,6 @@ unlock_fqs_ret:
trace_rcu_utilization("End fqs");
}
#else /* #ifdef CONFIG_SMP */
static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
{
set_need_resched();
}
#endif /* #else #ifdef CONFIG_SMP */
/*
* This does the RCU core processing work for the specified rcu_state
* and rcu_data structures. This may be called only from the CPU to

12
kernel/rcutree_plugin.h
View File

@ -1858,16 +1858,6 @@ static void __cpuinit rcu_prepare_kthreads(int cpu)
#endif /* #else #ifdef CONFIG_RCU_BOOST */
#ifndef CONFIG_SMP
void synchronize_sched_expedited(void)
{
cond_resched();
}
EXPORT_SYMBOL_GPL(synchronize_sched_expedited);
#else /* #ifndef CONFIG_SMP */
static atomic_t sync_sched_expedited_started = ATOMIC_INIT(0);
static atomic_t sync_sched_expedited_done = ATOMIC_INIT(0);
@ -1982,8 +1972,6 @@ void synchronize_sched_expedited(void)
}
EXPORT_SYMBOL_GPL(synchronize_sched_expedited);
#endif /* #else #ifndef CONFIG_SMP */
#if !defined(CONFIG_RCU_FAST_NO_HZ)
/*