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.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 63d3a24..81ff7f2 100644 (file)
--- 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 3a1c99b..16f4986 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -858,7 +858,6 @@ void wq_worker_waking_up(struct task_struct *task, int cpu)
 /**
  * wq_worker_sleeping - a worker is going to sleep
  * @task: task going to sleep
- * @cpu: CPU in question, must be the current CPU number
  *
  * This function is called during schedule() when a busy worker is
  * going to sleep.  Worker on the same cpu can be woken up by
@@ -870,7 +869,7 @@ 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 +885,7 @@ 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 != raw_smp_processor_id()))
                return NULL;
 
        /*

diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index 4521587..8635417 100644 (file)
--- 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 */