[tip:sched/locking] sched: Remove rq argument to sched_class::task_waking()

[tip-bot for Peter Zijlstra]

Commit-ID:  74f8e4b2335de45485b8d5b31a504747f13c8070
Gitweb:     http://git.kernel.org/tip/74f8e4b2335de45485b8d5b31a504747f13c8070
Author:     Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Tue, 5 Apr 2011 17:23:47 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 14 Apr 2011 08:52:36 +0200

sched: Remove rq argument to sched_class::task_waking()

In preparation of calling this without rq->lock held, remove the
dependency on the rq argument.

Reviewed-by: Frank Rowand <frank.rowand@xxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20110405152729.071474242@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 include/linux/sched.h |   10 +++++++---
 kernel/sched.c        |    2 +-
 kernel/sched_fair.c   |    4 +++-
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ff4e2f9..7f5732f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1048,8 +1048,12 @@ struct sched_domain;
 #define WF_FORK		0x02		/* child wakeup after fork */
 
 #define ENQUEUE_WAKEUP		1
-#define ENQUEUE_WAKING		2
-#define ENQUEUE_HEAD		4
+#define ENQUEUE_HEAD		2
+#ifdef CONFIG_SMP
+#define ENQUEUE_WAKING		4	/* sched_class::task_waking was called */
+#else
+#define ENQUEUE_WAKING		0
+#endif
 
 #define DEQUEUE_SLEEP		1
 
@@ -1071,7 +1075,7 @@ struct sched_class {
 
 	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
 	void (*post_schedule) (struct rq *this_rq);
-	void (*task_waking) (struct rq *this_rq, struct task_struct *task);
+	void (*task_waking) (struct task_struct *task);
 	void (*task_woken) (struct rq *this_rq, struct task_struct *task);
 
 	void (*set_cpus_allowed)(struct task_struct *p,
diff --git a/kernel/sched.c b/kernel/sched.c
index d4b815d..46f42ca 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2531,7 +2531,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 	p->state = TASK_WAKING;
 
 	if (p->sched_class->task_waking) {
-		p->sched_class->task_waking(rq, p);
+		p->sched_class->task_waking(p);
 		en_flags |= ENQUEUE_WAKING;
 	}
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 96b2c95..ad4c414f 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1372,11 +1372,13 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 
 #ifdef CONFIG_SMP
 
-static void task_waking_fair(struct rq *rq, struct task_struct *p)
+static void task_waking_fair(struct task_struct *p)
 {
 	struct sched_entity *se = &p->se;
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 
+	lockdep_assert_held(&task_rq(p)->lock);
+
 	se->vruntime -= cfs_rq->min_vruntime;
 }
 
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