rcu: Abstract default callback-list initialization from init_callback_list()

In preparation for early-boot posting of callbacks, this commit abstracts
initialization of the default (non-no-CB) callbacks list from the
init_callback_list() function into a new init_default_callback_list()
function.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 14 insertions, 4 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 48d640ca1a05..f8cdb92da10b 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1328,20 +1328,30 @@ void rcu_cpu_stall_reset(void)
 }
 
 /*
- * Initialize the specified rcu_data structure's callback list to empty.
+ * Initialize the specified rcu_data structure's default callback list
+ * to empty.  The default callback list is the one that is not used by
+ * no-callbacks CPUs.
  */
-static void init_callback_list(struct rcu_data *rdp)
+static void init_default_callback_list(struct rcu_data *rdp)
 {
         int i;
 
-        if (init_nocb_callback_list(rdp))
-                return;
         rdp->nxtlist = NULL;
         for (i = 0; i < RCU_NEXT_SIZE; i++)
                 rdp->nxttail[i] = &rdp->nxtlist;
 }
 
 /*
+ * Initialize the specified rcu_data structure's callback list to empty.
+ */
+static void init_callback_list(struct rcu_data *rdp)
+{
+        if (init_nocb_callback_list(rdp))
+                return;
+        init_default_callback_list(rdp);
+}
+
+/*
  * Determine the value that ->completed will have at the end of the
  * next subsequent grace period.  This is used to tag callbacks so that
  * a CPU can invoke callbacks in a timely fashion even if that CPU has