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, 1 insertions, 2 deletions

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 9cb3a68819fa..5a80cdd9a0a3 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -687,8 +687,7 @@ static void rcu_preempt_check_callbacks(int cpu)
  */
 static void rcu_preempt_process_callbacks(void)
 {
-        __rcu_process_callbacks(&rcu_preempt_state,
-                                &__get_cpu_var(rcu_preempt_data));
+        __rcu_process_callbacks(&rcu_preempt_state);
 }
 
 #ifdef CONFIG_RCU_BOOST