[PATCH] RCU Documentation

[Urs Thuermann <urs@isnogud.escape.de>]

Updater should use _rcu variant of list_del().


urs



Signed-off-by: Urs Thuermann <urs@isnogud.escape.de>

--- linux-2.6.17/Documentation/RCU/whatisRCU.txt.orig
+++ linux-2.6.17/Documentation/RCU/whatisRCU.txt
@@ -677,8 +677,9 @@
 	+	spin_lock(&listmutex);
 		list_for_each_entry(p, head, lp) {
 			if (p->key == key) {
-				list_del(&p->list);
+	-			list_del(&p->list);
 	-			write_unlock(&listmutex);
+	+			list_del_rcu(&p->list);
 	+			spin_unlock(&listmutex);
 	+			synchronize_rcu();
 				kfree(p);
@@ -726,7 +727,7 @@
  5   write_lock(&listmutex);            5   spin_lock(&listmutex);
  6   list_for_each_entry(p, head, lp) { 6   list_for_each_entry(p, head, lp) {
  7     if (p->key == key) {             7     if (p->key == key) {
- 8       list_del(&p->list);            8       list_del(&p->list);
+ 8       list_del(&p->list);            8       list_del_rcu(&p->list);
  9       write_unlock(&listmutex);      9       spin_unlock(&listmutex);
                                        10       synchronize_rcu();
 10       kfree(p);                     11       kfree(p);
-
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