sched: Add enqueue/dequeue flags

In order to reduce the dependency on TASK_WAKING rework the enqueue
interface to support a proper flags field.

Replace the int wakeup, bool head arguments with an int flags argument
and create the following flags:

  ENQUEUE_WAKEUP - the enqueue is a wakeup of a sleeping task,
  ENQUEUE_WAKING - the enqueue has relative vruntime due to
                   having sched_class::task_waking() called,
  ENQUEUE_HEAD - the waking task should be places on the head
                 of the priority queue (where appropriate).

For symmetry also convert sched_class::dequeue() to a flags scheme.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 3 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index fb6c18843ee8..e3e900f318d7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1032,12 +1032,17 @@ struct sched_domain;
 #define WF_SYNC         0x01            /* waker goes to sleep after wakup */
 #define WF_FORK         0x02            /* child wakeup after fork */
 
+#define ENQUEUE_WAKEUP          1
+#define ENQUEUE_WAKING          2
+#define ENQUEUE_HEAD            4
+
+#define DEQUEUE_SLEEP           1
+
 struct sched_class {
         const struct sched_class *next;
 
-        void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup,
-                              bool head);
-        void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
+        void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
+        void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
         void (*yield_task) (struct rq *rq);
 
         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);