---

yaml --- r: 26701 b: refs/heads/master c: 986733e h: refs/heads/master i: 26699: 1296c40 v: v3
git-mirror · May 15, 2006 · a506567 · a506567
1 parent 62f0b19
commit a506567
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Showing 3 changed files with 21 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3b7c8108273bed41a2fc04533cc9f2026ff38c8e
+refs/heads/master: 986733e01d258c26107f1da9d8d47c718349ad2f
diff --git a/trunk/include/linux/rcupdate.h b/trunk/include/linux/rcupdate.h
@@ -132,6 +132,7 @@ static inline void rcu_bh_qsctr_inc(int cpu)
 }
 
 extern int rcu_pending(int cpu);
+extern int rcu_needs_cpu(int cpu);
 
 /**
  * rcu_read_lock - mark the beginning of an RCU read-side critical section.

diff --git a/trunk/kernel/rcupdate.c b/trunk/kernel/rcupdate.c
@@ -479,12 +479,31 @@ static int __rcu_pending(struct rcu_ctrlblk *rcp, struct rcu_data *rdp)
 	return 0;
 }
 
+/*
+ * Check to see if there is any immediate RCU-related work to be done
+ * by the current CPU, returning 1 if so.  This function is part of the
+ * RCU implementation; it is -not- an exported member of the RCU API.
+ */
 int rcu_pending(int cpu)
 {
 	return __rcu_pending(&rcu_ctrlblk, &per_cpu(rcu_data, cpu)) ||
 		__rcu_pending(&rcu_bh_ctrlblk, &per_cpu(rcu_bh_data, cpu));
 }
 
+/*
+ * Check to see if any future RCU-related work will need to be done
+ * by the current CPU, even if none need be done immediately, returning
+ * 1 if so.  This function is part of the RCU implementation; it is -not-
+ * an exported member of the RCU API.
+ */
+int rcu_needs_cpu(int cpu)
+{
+	struct rcu_data *rdp = &per_cpu(rcu_data, cpu);
+	struct rcu_data *rdp_bh = &per_cpu(rcu_bh_data, cpu);
+
+	return (!!rdp->curlist || !!rdp_bh->curlist || rcu_pending(cpu));
+}
+
 void rcu_check_callbacks(int cpu, int user)
 {
 	if (user ||
-Original file line number
+Diff line change
@@ Expand Up / @@ -132,6 +132,7 @@ static inline void rcu_bh_qsctr_inc(int cpu) @@
     }
     extern int rcu_pending(int cpu);
+    extern int rcu_needs_cpu(int cpu);
     /**
      * rcu_read_lock - mark the beginning of an RCU read-side critical section.
@@ Expand Down @@