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authorUrs Thuermann <urs@isnogud.escape.de>2006-07-10 07:44:06 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-10 16:24:15 -0400
commit82a854ec4f46c5fbef11b06bb49078ecc5784a2d (patch)
treec0a04ec612047065d94d1372871eecdb6401d287 /Documentation
parent1454aed92b6b89cb1fbe3cbecd8ceaa7a122f3b7 (diff)
[PATCH] RCU Documentation fix
Updater should use _rcu variant of list_del(). Signed-off-by: Urs Thuermann <urs@isnogud.escape.de> Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/RCU/whatisRCU.txt5
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt
index 4f41a60e5111..318df44259b3 100644
--- a/Documentation/RCU/whatisRCU.txt
+++ b/Documentation/RCU/whatisRCU.txt
@@ -687,8 +687,9 @@ diff shows how closely related RCU and reader-writer locking can be.
687 + spin_lock(&listmutex); 687 + spin_lock(&listmutex);
688 list_for_each_entry(p, head, lp) { 688 list_for_each_entry(p, head, lp) {
689 if (p->key == key) { 689 if (p->key == key) {
690 list_del(&p->list); 690 - list_del(&p->list);
691 - write_unlock(&listmutex); 691 - write_unlock(&listmutex);
692 + list_del_rcu(&p->list);
692 + spin_unlock(&listmutex); 693 + spin_unlock(&listmutex);
693 + synchronize_rcu(); 694 + synchronize_rcu();
694 kfree(p); 695 kfree(p);
@@ -736,7 +737,7 @@ Or, for those who prefer a side-by-side listing:
736 5 write_lock(&listmutex); 5 spin_lock(&listmutex); 737 5 write_lock(&listmutex); 5 spin_lock(&listmutex);
737 6 list_for_each_entry(p, head, lp) { 6 list_for_each_entry(p, head, lp) { 738 6 list_for_each_entry(p, head, lp) { 6 list_for_each_entry(p, head, lp) {
738 7 if (p->key == key) { 7 if (p->key == key) { 739 7 if (p->key == key) { 7 if (p->key == key) {
739 8 list_del(&p->list); 8 list_del(&p->list); 740 8 list_del(&p->list); 8 list_del_rcu(&p->list);
740 9 write_unlock(&listmutex); 9 spin_unlock(&listmutex); 741 9 write_unlock(&listmutex); 9 spin_unlock(&listmutex);
741 10 synchronize_rcu(); 742 10 synchronize_rcu();
74210 kfree(p); 11 kfree(p); 74310 kfree(p); 11 kfree(p);