linux-kernel - [PATCH 1/2] sched/core: Get rid of 'cpu' argument in wq_worker

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Message-Id: <5f0a5da6830b7dd881d54f11fd5772bee1236863.1456676913.git.agordeev@redhat.com>
Date:	Sun, 28 Feb 2016 17:40:37 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 1/2] sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()

Given that wq_worker_sleeping() could only be called for a
CPU it is running on, we do not need passing a CPU ID as an
argument.

Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 kernel/sched/core.c         | 2 +-
 kernel/workqueue.c          | 4 ++--
 kernel/workqueue_internal.h | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9503d59..4e56a4d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3257,7 +3257,7 @@ static void __sched notrace __schedule(bool preempt)
 			if (prev->flags & PF_WQ_WORKER) {
 				struct task_struct *to_wakeup;
 
-				to_wakeup = wq_worker_sleeping(prev, cpu);
+				to_wakeup = wq_worker_sleeping(prev);
 				if (to_wakeup)
 					try_to_wake_up_local(to_wakeup);
 			}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7ff5dc7..967a1ab 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -870,7 +870,7 @@ void wq_worker_waking_up(struct task_struct *task, int cpu)
  * Return:
  * Worker task on @cpu to wake up, %NULL if none.
  */
-struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
+struct task_struct *wq_worker_sleeping(struct task_struct *task)
 {
 	struct worker *worker = kthread_data(task), *to_wakeup = NULL;
 	struct worker_pool *pool;
@@ -886,7 +886,7 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
 	pool = worker->pool;
 
 	/* this can only happen on the local cpu */
-	if (WARN_ON_ONCE(cpu != raw_smp_processor_id() || pool->cpu != cpu))
+	if (WARN_ON_ONCE(pool->cpu != smp_processor_id()))
 		return NULL;
 
 	/*
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index 4521587..8635417 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -69,6 +69,6 @@ static inline struct worker *current_wq_worker(void)
  * sched/core.c and workqueue.c.
  */
 void wq_worker_waking_up(struct task_struct *task, int cpu);
-struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
+struct task_struct *wq_worker_sleeping(struct task_struct *task);
 
 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
-- 
1.8.3.1