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-rw-r--r--include/linux/rcupdate.h23
-rw-r--r--kernel/rcupdate.c16
2 files changed, 34 insertions, 5 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 4d747433916..fd276adf0fd 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -157,9 +157,9 @@ static inline int rcu_pending(int cpu)
/**
* rcu_read_lock - mark the beginning of an RCU read-side critical section.
*
- * When synchronize_kernel() is invoked on one CPU while other CPUs
+ * When synchronize_rcu() is invoked on one CPU while other CPUs
* are within RCU read-side critical sections, then the
- * synchronize_kernel() is guaranteed to block until after all the other
+ * synchronize_rcu() is guaranteed to block until after all the other
* CPUs exit their critical sections. Similarly, if call_rcu() is invoked
* on one CPU while other CPUs are within RCU read-side critical
* sections, invocation of the corresponding RCU callback is deferred
@@ -256,6 +256,21 @@ static inline int rcu_pending(int cpu)
(p) = (v); \
})
+/**
+ * synchronize_sched - block until all CPUs have exited any non-preemptive
+ * kernel code sequences.
+ *
+ * This means that all preempt_disable code sequences, including NMI and
+ * hardware-interrupt handlers, in progress on entry will have completed
+ * before this primitive returns. However, this does not guarantee that
+ * softirq handlers will have completed, since in some kernels
+ *
+ * This primitive provides the guarantees made by the (deprecated)
+ * synchronize_kernel() API. In contrast, synchronize_rcu() only
+ * guarantees that rcu_read_lock() sections will have completed.
+ */
+#define synchronize_sched() synchronize_rcu()
+
extern void rcu_init(void);
extern void rcu_check_callbacks(int cpu, int user);
extern void rcu_restart_cpu(int cpu);
@@ -265,7 +280,9 @@ extern void FASTCALL(call_rcu(struct rcu_head *head,
void (*func)(struct rcu_head *head)));
extern void FASTCALL(call_rcu_bh(struct rcu_head *head,
void (*func)(struct rcu_head *head)));
-extern void synchronize_kernel(void);
+extern __deprecated_for_modules void synchronize_kernel(void);
+extern void synchronize_rcu(void);
+void synchronize_idle(void);
#endif /* __KERNEL__ */
#endif /* __LINUX_RCUPDATE_H */
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index ad497722f04..f436993bd59 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -444,15 +444,18 @@ static void wakeme_after_rcu(struct rcu_head *head)
}
/**
- * synchronize_kernel - wait until a grace period has elapsed.
+ * synchronize_rcu - wait until a grace period has elapsed.
*
* Control will return to the caller some time after a full grace
* period has elapsed, in other words after all currently executing RCU
* read-side critical sections have completed. RCU read-side critical
* sections are delimited by rcu_read_lock() and rcu_read_unlock(),
* and may be nested.
+ *
+ * If your read-side code is not protected by rcu_read_lock(), do -not-
+ * use synchronize_rcu().
*/
-void synchronize_kernel(void)
+void synchronize_rcu(void)
{
struct rcu_synchronize rcu;
@@ -464,7 +467,16 @@ void synchronize_kernel(void)
wait_for_completion(&rcu.completion);
}
+/*
+ * Deprecated, use synchronize_rcu() or synchronize_sched() instead.
+ */
+void synchronize_kernel(void)
+{
+ synchronize_rcu();
+}
+
module_param(maxbatch, int, 0);
EXPORT_SYMBOL(call_rcu); /* WARNING: GPL-only in April 2006. */
EXPORT_SYMBOL(call_rcu_bh); /* WARNING: GPL-only in April 2006. */
+EXPORT_SYMBOL_GPL(synchronize_rcu);
EXPORT_SYMBOL(synchronize_kernel); /* WARNING: GPL-only in April 2006. */