rcu: Remove rsp parameter from __rcu_pending()

There now is only one rcu_state structure in a given build of the Linux
kernel, so there is no need to pass it as a parameter to RCU's functions.
This commit therefore removes the rsp parameter from __rcu_pending(),
and also inlines it into rcu_pending(), removing the for_each_rcu_flavor()
while in the neighborhood..

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

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9f5e67e..7ce6913 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2997,8 +2997,7 @@ EXPORT_SYMBOL_GPL(call_rcu_sched);
  * callbacks in the list of pending callbacks. Until then, this
  * function may only be called from __kfree_rcu().
  */
-void kfree_call_rcu(struct rcu_head *head,
-                   rcu_callback_t func)
+void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
 {
        __call_rcu(head, func, -1, 1);
 }
@@ -3080,21 +3079,23 @@ void cond_synchronize_sched(unsigned long oldstate)
 EXPORT_SYMBOL_GPL(cond_synchronize_sched);
 
 /*
- * Check to see if there is any immediate RCU-related work to be done
- * by the current CPU, for the specified type of RCU, returning 1 if so.
- * The checks are in order of increasing expense: checks that can be
- * carried out against CPU-local state are performed first.  However,
- * we must check for CPU stalls first, else we might not get a chance.
+ * Check to see if there is any immediate RCU-related work to be done by
+ * the current CPU, for the specified type of RCU, returning 1 if so and
+ * zero otherwise.  The checks are in order of increasing expense: checks
+ * that can be carried out against CPU-local state are performed first.
+ * However, we must check for CPU stalls first, else we might not get
+ * a chance.
  */
-static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
+static int rcu_pending(void)
 {
+       struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
        struct rcu_node *rnp = rdp->mynode;
 
        /* Check for CPU stalls, if enabled. */
        check_cpu_stall(rdp);
 
        /* Is this CPU a NO_HZ_FULL CPU that should ignore RCU? */
-       if (rcu_nohz_full_cpu(rsp))
+       if (rcu_nohz_full_cpu(&rcu_state))
                return 0;
 
        /* Is the RCU core waiting for a quiescent state from this CPU? */
@@ -3125,21 +3126,6 @@ static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
 }
 
 /*
- * 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.
- */
-static int rcu_pending(void)
-{
-       struct rcu_state *rsp;
-
-       for_each_rcu_flavor(rsp)
-               if (__rcu_pending(rsp, this_cpu_ptr(&rcu_data)))
-                       return 1;
-       return 0;
-}
-
-/*
  * Return true if the specified CPU has any callback.  If all_lazy is
  * non-NULL, store an indication of whether all callbacks are lazy.
  * (If there are no callbacks, all of them are deemed to be lazy.)