---

yaml --- r: 234945 b: refs/heads/master c: e611eec h: refs/heads/master i: 234943: a94e191 v: v3
git-mirror · Mar 4, 2011 · cfa2b88 · cfa2b88
1 parent 0864d5f
commit cfa2b88
Show file tree

Hide file tree

Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: fe8e64071a4ff5925ced4f33cb32ba090a04649c
+refs/heads/master: e611eecd6f9f91d74beda8cfbb3b5e02abdeb5a1
diff --git a/trunk/kernel/rcupdate.c b/trunk/kernel/rcupdate.c
@@ -214,6 +214,11 @@ static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
 		 * Ensure that queued callbacks are all executed.
 		 * If we detect that we are nested in a RCU read-side critical
 		 * section, we should simply fail, otherwise we would deadlock.
+		 * Note that the machinery to reliably determine whether
+		 * or not we are in an RCU read-side critical section
+		 * exists only in the preemptible RCU implementations
+		 * (TINY_PREEMPT_RCU and TREE_PREEMPT_RCU), which is why
+		 * DEBUG_OBJECTS_RCU_HEAD is disallowed if !PREEMPT.
 		 */
 		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
 		    irqs_disabled()) {