sh: convert /proc/cpu/aligmnent, /proc/cpu/kernel_alignment to seq_file

[safe/jmp/linux-2.6] / kernel / rcutree_plugin.h

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index ebd20ee..ef2a58c 100644 (file)
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -304,21 +304,25 @@ static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp)
  * parent is to remove the need for rcu_read_unlock_special() to
  * make more than two attempts to acquire the target rcu_node's lock.
  *
+ * Returns 1 if there was previously a task blocking the current grace
+ * period on the specified rcu_node structure.
+ *
  * The caller must hold rnp->lock with irqs disabled.
  */
-static void rcu_preempt_offline_tasks(struct rcu_state *rsp,
-                                     struct rcu_node *rnp,
-                                     struct rcu_data *rdp)
+static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
+                                    struct rcu_node *rnp,
+                                    struct rcu_data *rdp)
 {
        int i;
        struct list_head *lp;
        struct list_head *lp_root;
+       int retval = rcu_preempted_readers(rnp);
        struct rcu_node *rnp_root = rcu_get_root(rsp);
        struct task_struct *tp;
 
        if (rnp == rnp_root) {
                WARN_ONCE(1, "Last CPU thought to be offlined?");
-               return;  /* Shouldn't happen: at least one CPU online. */
+               return 0;  /* Shouldn't happen: at least one CPU online. */
        }
        WARN_ON_ONCE(rnp != rdp->mynode &&
                     (!list_empty(&rnp->blocked_tasks[0]) ||
@@ -342,6 +346,8 @@ static void rcu_preempt_offline_tasks(struct rcu_state *rsp,
                        spin_unlock(&rnp_root->lock); /* irqs remain disabled */
                }
        }
+
+       return retval;
 }
 
 /*
@@ -532,12 +538,15 @@ static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp)
 
 /*
  * Because preemptable RCU does not exist, it never needs to migrate
- * tasks that were blocked within RCU read-side critical sections.
+ * tasks that were blocked within RCU read-side critical sections, and
+ * such non-existent tasks cannot possibly have been blocking the current
+ * grace period.
  */
-static void rcu_preempt_offline_tasks(struct rcu_state *rsp,
-                                     struct rcu_node *rnp,
-                                     struct rcu_data *rdp)
+static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
+                                    struct rcu_node *rnp,
+                                    struct rcu_data *rdp)
 {
+       return 0;
 }
 
 /*