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Subject[tip:sched/locking] sched: Remove rq argument to sched_class::task_waking()
Commit-ID:  74f8e4b2335de45485b8d5b31a504747f13c8070
Gitweb: http://git.kernel.org/tip/74f8e4b2335de45485b8d5b31a504747f13c8070
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Tue, 5 Apr 2011 17:23:47 +0200
Committer: Ingo Molnar <mingo@elte.hu>
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@am.sony.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110405152729.071474242@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
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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