[PATCH] sched/fair: polish function update_next_balance()

[Leo Yan]

Function update_next_balance() is only used by idle balance, so its
parameter 'cpu_busy' is redundant and always be passed with 0.

This patch is to polish update_next_balance() to remove parameter
'cpu_busy'.

Signed-off-by: Leo Yan <leo....@linaro.org>
---
 kernel/sched/fair.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4088eed..e342159 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7704,11 +7704,12 @@ get_sd_balance_interval(struct sched_domain *sd, int 
cpu_busy)
 }
 
 static inline void
-update_next_balance(struct sched_domain *sd, int cpu_busy, unsigned long 
*next_balance)
+update_next_balance(struct sched_domain *sd, unsigned long *next_balance)
 {
        unsigned long interval, next;
 
-       interval = get_sd_balance_interval(sd, cpu_busy);
+       /* used by idle balance, so cpu_busy = 0 */
+       interval = get_sd_balance_interval(sd, 0);
        next = sd->last_balance + interval;
 
        if (time_after(*next_balance, next))
@@ -7738,7 +7739,7 @@ static int idle_balance(struct rq *this_rq)
                rcu_read_lock();
                sd = rcu_dereference_check_sched_domain(this_rq->sd);
                if (sd)
-                       update_next_balance(sd, 0, &next_balance);
+                       update_next_balance(sd, &next_balance);
                rcu_read_unlock();
 
                goto out;
@@ -7756,7 +7757,7 @@ static int idle_balance(struct rq *this_rq)
                        continue;
 
                if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) {
-                       update_next_balance(sd, 0, &next_balance);
+                       update_next_balance(sd, &next_balance);
                        break;
                }
 
@@ -7774,7 +7775,7 @@ static int idle_balance(struct rq *this_rq)
                        curr_cost += domain_cost;
                }
 
-               update_next_balance(sd, 0, &next_balance);
+               update_next_balance(sd, &next_balance);
 
                /*
                 * Stop searching for tasks to pull if there are
-- 
1.9.1