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-rw-r--r--Documentation/RCU/listRCU.txt21
1 files changed, 12 insertions, 9 deletions
diff --git a/Documentation/RCU/listRCU.txt b/Documentation/RCU/listRCU.txt
index f8a54fa..1fd1753 100644
--- a/Documentation/RCU/listRCU.txt
+++ b/Documentation/RCU/listRCU.txt
@@ -232,7 +232,7 @@ entry does not exist. For this to be helpful, the search function must
return holding the per-entry spinlock, as ipc_lock() does in fact do.
Quick Quiz: Why does the search function need to return holding the
-per-entry lock for this deleted-flag technique to be helpful?
+ per-entry lock for this deleted-flag technique to be helpful?
If the system-call audit module were to ever need to reject stale data,
one way to accomplish this would be to add a "deleted" flag and a "lock"
@@ -275,8 +275,8 @@ flag under the spinlock as follows:
{
struct audit_entry *e;
- /* Do not use the _rcu iterator here, since this is the only
- * deletion routine. */
+ /* Do not need to use the _rcu iterator here, since this
+ * is the only deletion routine. */
list_for_each_entry(e, list, list) {
if (!audit_compare_rule(rule, &e->rule)) {
spin_lock(&e->lock);
@@ -304,9 +304,12 @@ function to reject newly deleted data.
Answer to Quick Quiz
-
-If the search function drops the per-entry lock before returning, then
-the caller will be processing stale data in any case. If it is really
-OK to be processing stale data, then you don't need a "deleted" flag.
-If processing stale data really is a problem, then you need to hold the
-per-entry lock across all of the code that uses the value looked up.
+ Why does the search function need to return holding the per-entry
+ lock for this deleted-flag technique to be helpful?
+
+ If the search function drops the per-entry lock before returning,
+ then the caller will be processing stale data in any case. If it
+ is really OK to be processing stale data, then you don't need a
+ "deleted" flag. If processing stale data really is a problem,
+ then you need to hold the per-entry lock across all of the code
+ that uses the value that was returned.
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