rcu: Remove unneeded __rcu_process_callbacks() argument

With the advent of __this_cpu_ptr(), it is no longer necessary to pass
both the rcu_state and rcu_data structures into __rcu_process_callbacks().
This commit therefore computes the rcu_data pointer from the rcu_state
pointer within __rcu_process_callbacks() so that callers can pass in
only the pointer to the rcu_state structure.  This paves the way for
linking the rcu_state structures together and iterating over them.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index dda43d826504..5376a156be8a 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1788,9 +1788,10 @@ unlock_fqs_ret:
  * whom the rdp belongs.
  */
 static void
-__rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
+__rcu_process_callbacks(struct rcu_state *rsp)
 {
         unsigned long flags;
+        struct rcu_data *rdp = __this_cpu_ptr(rsp->rda);
 
         WARN_ON_ONCE(rdp->beenonline == 0);
 
@@ -1827,9 +1828,8 @@ __rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
 static void rcu_process_callbacks(struct softirq_action *unused)
 {
         trace_rcu_utilization("Start RCU core");
-        __rcu_process_callbacks(&rcu_sched_state,
-                                &__get_cpu_var(rcu_sched_data));
-        __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));
+        __rcu_process_callbacks(&rcu_sched_state);
+        __rcu_process_callbacks(&rcu_bh_state);
         rcu_preempt_process_callbacks();
         trace_rcu_utilization("End RCU core");
 }