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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-11-22 08:53:49 -0800
committerIngo Molnar <mingo@elte.hu>2009-11-22 18:58:16 +0100
commit9f680ab41485edfdc96331b70afa7513aa0a7720 (patch)
tree620b34f8129c0ea4ddee033c9875a9f60bfba2ae
parentb668c9cf3e58739dac54a1d6f42f2b4bdd980b3e (diff)
downloadlinux-9f680ab41485edfdc96331b70afa7513aa0a7720.tar.bz2
rcu: Eliminate unneeded function wrapping
The functions rcu_init() is a wrapper for __rcu_init(), and also sets up the CPU-hotplug notifier for rcu_barrier_cpu_hotplug(). But TINY_RCU doesn't need CPU-hotplug notification, and the rcu_barrier_cpu_hotplug() is a simple wrapper for rcu_cpu_notify(). So push rcu_init() out to kernel/rcutree.c and kernel/rcutiny.c and get rid of the wrapper function rcu_barrier_cpu_hotplug(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12589088302320-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/rcutiny.h2
-rw-r--r--include/linux/rcutree.h3
-rw-r--r--kernel/rcupdate.c22
-rw-r--r--kernel/rcutiny.c11
-rw-r--r--kernel/rcutree.c17
5 files changed, 15 insertions, 40 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index 2c1fe8373e71..a3b6272af2dd 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -38,7 +38,6 @@ void rcu_bh_qs(int cpu);
#define rcu_init_sched() do { } while (0)
extern void rcu_check_callbacks(int cpu, int user);
-extern void __rcu_init(void);
/*
* Return the number of grace periods.
@@ -69,7 +68,6 @@ static inline void synchronize_rcu_bh_expedited(void)
}
struct notifier_block;
-extern int rcu_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu);
#ifdef CONFIG_NO_HZ
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 9642c6bcb399..111a65257350 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -34,8 +34,6 @@ struct notifier_block;
extern void rcu_sched_qs(int cpu);
extern void rcu_bh_qs(int cpu);
-extern int rcu_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu);
extern int rcu_needs_cpu(int cpu);
extern int rcu_expedited_torture_stats(char *page);
@@ -83,7 +81,6 @@ static inline void synchronize_rcu_bh_expedited(void)
synchronize_sched_expedited();
}
-extern void __rcu_init(void);
extern void rcu_check_callbacks(int cpu, int user);
extern long rcu_batches_completed(void);
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 7625f207f65e..eb6b534db318 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -161,28 +161,6 @@ EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
#endif /* #ifndef CONFIG_TINY_RCU */
-static int __cpuinit rcu_barrier_cpu_hotplug(struct notifier_block *self,
- unsigned long action, void *hcpu)
-{
- return rcu_cpu_notify(self, action, hcpu);
-}
-
-void __init rcu_init(void)
-{
- int i;
-
- __rcu_init();
- cpu_notifier(rcu_barrier_cpu_hotplug, 0);
-
- /*
- * We don't need protection against CPU-hotplug here because
- * this is called early in boot, before either interrupts
- * or the scheduler are operational.
- */
- for_each_online_cpu(i)
- rcu_barrier_cpu_hotplug(NULL, CPU_UP_PREPARE, (void *)(long)i);
-}
-
void rcu_scheduler_starting(void)
{
WARN_ON(num_online_cpus() != 1);
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index b33ec3aa377a..9f6d9ff2572c 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -178,15 +178,6 @@ static void rcu_process_callbacks(struct softirq_action *unused)
}
/*
- * Null function to handle CPU being onlined. Longer term, we want to
- * make TINY_RCU avoid using rcupdate.c, but later...
- */
-int rcu_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
-{
- return NOTIFY_OK;
-}
-
-/*
* Wait for a grace period to elapse. But it is illegal to invoke
* synchronize_sched() from within an RCU read-side critical section.
* Therefore, any legal call to synchronize_sched() is a quiescent
@@ -285,7 +276,7 @@ void rcu_barrier_sched(void)
}
EXPORT_SYMBOL_GPL(rcu_barrier_sched);
-void __rcu_init(void)
+void __init rcu_init(void)
{
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
}
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index b79bfcd28e95..e3d3bbddbcd5 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1644,8 +1644,8 @@ static void __cpuinit rcu_online_cpu(int cpu)
/*
* Handle CPU online/offline notification events.
*/
-int __cpuinit rcu_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
+static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
{
long cpu = (long)hcpu;
@@ -1781,8 +1781,10 @@ do { \
} \
} while (0)
-void __init __rcu_init(void)
+void __init rcu_init(void)
{
+ int i;
+
rcu_bootup_announce();
#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
printk(KERN_INFO "RCU-based detection of stalled CPUs is enabled.\n");
@@ -1791,6 +1793,15 @@ void __init __rcu_init(void)
RCU_INIT_FLAVOR(&rcu_bh_state, rcu_bh_data);
__rcu_init_preempt();
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+
+ /*
+ * We don't need protection against CPU-hotplug here because
+ * this is called early in boot, before either interrupts
+ * or the scheduler are operational.
+ */
+ cpu_notifier(rcu_cpu_notify, 0);
+ for_each_online_cpu(i)
+ rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)i);
}
#include "rcutree_plugin.h"