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authorLinus Torvalds <torvalds@linux-foundation.org>2008-07-15 13:59:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-15 13:59:31 -0700
commit64fd52a52077d3cd5a778ca031c0aaecf885eaa6 (patch)
tree00d72f4aac587eeeff89b8af369250725bf83c6a /kernel/rcupdate.c
parentfe1a6875fcaaac2041945008a9875d2c07be1d9b (diff)
parent6c9fcaf2eec1b9f85226a694230dd957dd7926b3 (diff)
Merge branch 'core/rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core/rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (23 commits) rcu classic: update qlen when cpu offline rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers) rcu: make quiescent rcutorture less power-hungry rcu, rcutorture: make quiescent rcutorture less power-hungry rcu: make rcutorture more vicious: reinstate boot-time testing rcu: make rcutorture more vicious: add stutter feature rcutorture: WARN_ON_ONCE(1) when detecting an error rcu: remove unused field struct rcu_data::rcu_tasklet Revert "prohibit rcutorture from being compiled into the kernel" rcu: fix nf_conntrack_helper.c build bug rculist.h: fix include in net/netfilter/nf_conntrack_netlink.c rcu: remove duplicated include in kernel/rcupreempt.c rcu: remove duplicated include in kernel/rcupreempt_trace.c RCU, rculist.h: fix list iterators rcu: fix rcu_try_flip_waitack_needed() to prevent grace-period stall rculist.h: use the rcu API rcu: split list.h and move rcu-protected lists into rculist.h sched: 1Q08 RCU doc update, add call_rcu_sched() rcu: add call_rcu_sched() and friends to rcutorture rcu: add rcu_barrier_sched() and rcu_barrier_bh() ...
Diffstat (limited to 'kernel/rcupdate.c')
-rw-r--r--kernel/rcupdate.c71
1 files changed, 49 insertions, 22 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index c09605f8d16..4a74b8d48d9 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -39,16 +39,16 @@
#include <linux/sched.h>
#include <asm/atomic.h>
#include <linux/bitops.h>
-#include <linux/completion.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/mutex.h>
#include <linux/module.h>
-struct rcu_synchronize {
- struct rcu_head head;
- struct completion completion;
+enum rcu_barrier {
+ RCU_BARRIER_STD,
+ RCU_BARRIER_BH,
+ RCU_BARRIER_SCHED,
};
static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL};
@@ -60,7 +60,7 @@ static struct completion rcu_barrier_completion;
* Awaken the corresponding synchronize_rcu() instance now that a
* grace period has elapsed.
*/
-static void wakeme_after_rcu(struct rcu_head *head)
+void wakeme_after_rcu(struct rcu_head *head)
{
struct rcu_synchronize *rcu;
@@ -77,17 +77,7 @@ static void wakeme_after_rcu(struct rcu_head *head)
* sections are delimited by rcu_read_lock() and rcu_read_unlock(),
* and may be nested.
*/
-void synchronize_rcu(void)
-{
- struct rcu_synchronize rcu;
-
- init_completion(&rcu.completion);
- /* Will wake me after RCU finished */
- call_rcu(&rcu.head, wakeme_after_rcu);
-
- /* Wait for it */
- wait_for_completion(&rcu.completion);
-}
+synchronize_rcu_xxx(synchronize_rcu, call_rcu)
EXPORT_SYMBOL_GPL(synchronize_rcu);
static void rcu_barrier_callback(struct rcu_head *notused)
@@ -99,19 +89,30 @@ static void rcu_barrier_callback(struct rcu_head *notused)
/*
* Called with preemption disabled, and from cross-cpu IRQ context.
*/
-static void rcu_barrier_func(void *notused)
+static void rcu_barrier_func(void *type)
{
int cpu = smp_processor_id();
struct rcu_head *head = &per_cpu(rcu_barrier_head, cpu);
atomic_inc(&rcu_barrier_cpu_count);
- call_rcu(head, rcu_barrier_callback);
+ switch ((enum rcu_barrier)type) {
+ case RCU_BARRIER_STD:
+ call_rcu(head, rcu_barrier_callback);
+ break;
+ case RCU_BARRIER_BH:
+ call_rcu_bh(head, rcu_barrier_callback);
+ break;
+ case RCU_BARRIER_SCHED:
+ call_rcu_sched(head, rcu_barrier_callback);
+ break;
+ }
}
-/**
- * rcu_barrier - Wait until all the in-flight RCUs are complete.
+/*
+ * Orchestrate the specified type of RCU barrier, waiting for all
+ * RCU callbacks of the specified type to complete.
*/
-void rcu_barrier(void)
+static void _rcu_barrier(enum rcu_barrier type)
{
BUG_ON(in_interrupt());
/* Take cpucontrol mutex to protect against CPU hotplug */
@@ -127,13 +128,39 @@ void rcu_barrier(void)
* until all the callbacks are queued.
*/
rcu_read_lock();
- on_each_cpu(rcu_barrier_func, NULL, 0, 1);
+ on_each_cpu(rcu_barrier_func, (void *)type, 0, 1);
rcu_read_unlock();
wait_for_completion(&rcu_barrier_completion);
mutex_unlock(&rcu_barrier_mutex);
}
+
+/**
+ * rcu_barrier - Wait until all in-flight call_rcu() callbacks complete.
+ */
+void rcu_barrier(void)
+{
+ _rcu_barrier(RCU_BARRIER_STD);
+}
EXPORT_SYMBOL_GPL(rcu_barrier);
+/**
+ * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete.
+ */
+void rcu_barrier_bh(void)
+{
+ _rcu_barrier(RCU_BARRIER_BH);
+}
+EXPORT_SYMBOL_GPL(rcu_barrier_bh);
+
+/**
+ * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks.
+ */
+void rcu_barrier_sched(void)
+{
+ _rcu_barrier(RCU_BARRIER_SCHED);
+}
+EXPORT_SYMBOL_GPL(rcu_barrier_sched);
+
void __init rcu_init(void)
{
__rcu_init();