rcu: Use bitwise instead of arithmetic operator for flags

This silences the following coccinelle warning:
  WARNING: sum of probable bitmasks, consider |

Signed-off-by: Hongbo Li <[email protected]>
Reviewed-by: "Paul E. McKenney" <[email protected]>
Signed-off-by: Neeraj Upadhyay <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>

Author: Hongbo Li

kernel/rcu/tree_plugin.h

@@ -183,9 +183,9 @@ static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp)
 	switch (blkd_state) {
 	case 0:
 	case                RCU_EXP_TASKS:
-	case                RCU_EXP_TASKS + RCU_GP_BLKD:
+	case                RCU_EXP_TASKS | RCU_GP_BLKD:
 	case RCU_GP_TASKS:
-	case RCU_GP_TASKS + RCU_EXP_TASKS:
+	case RCU_GP_TASKS | RCU_EXP_TASKS:
 
 		/*
 		 * Blocking neither GP, or first task blocking the normal
@@ -198,10 +198,10 @@ static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp)
 
 	case                                              RCU_EXP_BLKD:
 	case                                RCU_GP_BLKD:
-	case                                RCU_GP_BLKD + RCU_EXP_BLKD:
-	case RCU_GP_TASKS +                               RCU_EXP_BLKD:
-	case RCU_GP_TASKS +                 RCU_GP_BLKD + RCU_EXP_BLKD:
-	case RCU_GP_TASKS + RCU_EXP_TASKS + RCU_GP_BLKD + RCU_EXP_BLKD:
+	case                                RCU_GP_BLKD | RCU_EXP_BLKD:
+	case RCU_GP_TASKS |                               RCU_EXP_BLKD:
+	case RCU_GP_TASKS |                 RCU_GP_BLKD | RCU_EXP_BLKD:
+	case RCU_GP_TASKS | RCU_EXP_TASKS | RCU_GP_BLKD | RCU_EXP_BLKD:
 
 		/*
 		 * First task arriving that blocks either GP, or first task
@@ -214,9 +214,9 @@ static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp)
 		list_add_tail(&t->rcu_node_entry, &rnp->blkd_tasks);
 		break;
 
-	case                RCU_EXP_TASKS +               RCU_EXP_BLKD:
-	case                RCU_EXP_TASKS + RCU_GP_BLKD + RCU_EXP_BLKD:
-	case RCU_GP_TASKS + RCU_EXP_TASKS +               RCU_EXP_BLKD:
+	case                RCU_EXP_TASKS |               RCU_EXP_BLKD:
+	case                RCU_EXP_TASKS | RCU_GP_BLKD | RCU_EXP_BLKD:
+	case RCU_GP_TASKS | RCU_EXP_TASKS |               RCU_EXP_BLKD:
 
 		/*
 		 * Second or subsequent task blocking the expedited GP.
@@ -227,8 +227,8 @@ static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp)
 		list_add(&t->rcu_node_entry, rnp->exp_tasks);
 		break;
 
-	case RCU_GP_TASKS +                 RCU_GP_BLKD:
-	case RCU_GP_TASKS + RCU_EXP_TASKS + RCU_GP_BLKD:
+	case RCU_GP_TASKS |                 RCU_GP_BLKD:
+	case RCU_GP_TASKS | RCU_EXP_TASKS | RCU_GP_BLKD:
 
 		/*
 		 * Second or subsequent task blocking the normal GP.