[PATCH 3/3] sched/fair: Kill task_change_group_fair()

[Kirill Tkhai]

Since we need the special behaviour for TASK_MOVE_GROUP case only,
we may move the switch up to sched_change_group() and kill
task_change_group_fair().
I suppose, this may simplify the code in some way.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 kernel/sched/core.c  |    4 ++--
 kernel/sched/fair.c  |   15 +--------------
 kernel/sched/sched.h |    2 +-
 3 files changed, 4 insertions(+), 17 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8f972df76eb2..5007892342b2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6395,8 +6395,8 @@ static void sched_change_group(struct task_struct *tsk, 
int type)
        tsk->sched_task_group = tg;
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-       if (tsk->sched_class->task_change_group)
-               tsk->sched_class->task_change_group(tsk, type);
+       if (tsk->sched_class->task_move_group && type == TASK_MOVE_GROUP)
+               tsk->sched_class->task_move_group(tsk);
        else
 #endif
                set_task_rq(tsk, task_cpu(tsk));
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a005bee12e0b..cf6d12513a3f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9206,19 +9206,6 @@ static void task_move_group_fair(struct task_struct *p)
        attach_task_cfs_rq(p);
 }
 
-static void task_change_group_fair(struct task_struct *p, int type)
-{
-       switch (type) {
-       case TASK_SET_GROUP:
-               set_task_rq(p, task_cpu(p));
-               break;
-
-       case TASK_MOVE_GROUP:
-               task_move_group_fair(p);
-               break;
-       }
-}
-
 void free_fair_sched_group(struct task_group *tg)
 {
        int i;
@@ -9462,7 +9449,7 @@ const struct sched_class fair_sched_class = {
        .update_curr            = update_curr_fair,
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-       .task_change_group      = task_change_group_fair,
+       .task_move_group        = task_move_group_fair,
 #endif
 };
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4a9313f0b5c8..f2bc04826ea5 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1407,7 +1407,7 @@ struct sched_class {
 #define TASK_MOVE_GROUP        1
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-       void (*task_change_group) (struct task_struct *p, int type);
+       void (*task_move_group) (struct task_struct *p);
 #endif
 };