[PATCH] Fix comment to synchronize_sched()

[Paul E. McKenney]

Hello!

Fix to broken comment to synchronize_rcu() noted by Keith Owens.
Also add sentence noting that synchronize_sched() and synchronize_rcu()
are not necessarily identical.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
CC: Keith Owens <kaos@xxxxxxx>
CC: Stephen Hemminger <shemminger@xxxxxxxx>

---

diff -urpNa -X dontdiff linux-2.6.15/include/linux/rcupdate.h linux-2.6.15-RCUcomment/include/linux/rcupdate.h
--- linux-2.6.15/include/linux/rcupdate.h	2006-01-02 19:21:10.000000000 -0800
+++ linux-2.6.15-RCUcomment/include/linux/rcupdate.h	2006-01-17 18:48:33.000000000 -0800
@@ -265,11 +265,14 @@ static inline int rcu_pending(int cpu)
  * 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
+ * softirq handlers will have completed, since in some kernels, these
+ * handlers can run in process context, and can block.
  *
  * 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.
+ * In "classic RCU", these two guarantees happen to be one and
+ * the same, but can differ in realtime RCU implementations.
  */
 #define synchronize_sched() synchronize_rcu()
 
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