mm: Replace call_rcu_sched() with call_rcu()

Now that call_rcu()'s callback is not invoked until after all
preempt-disable regions of code have completed (in addition to explicitly
marked RCU read-side critical sections), call_rcu() can be used in place
of call_rcu_sched().  This commit therefore makes that change.
Signed-off-by: NPaul E. McKenney <paulmck@linux.ibm.com>

mm/mmu_gather.c

@@ -199,7 +199,7 @@ void tlb_table_flush(struct mmu_gather *tlb)
 
 	if (*batch) {
 		tlb_table_invalidate(tlb);
-		call_rcu_sched(&(*batch)->rcu, tlb_remove_table_rcu);
+		call_rcu(&(*batch)->rcu, tlb_remove_table_rcu);
 		*batch = NULL;
 	}
 }