workqueue: rename cpu_workqueue to pool_workqueue

workqueue has moved away from global_cwqs to worker_pools and with the
scheduled custom worker pools, wforkqueues will be associated with
pools which don't have anything to do with CPUs.  The workqueue code
went through significant amount of changes recently and mass renaming
isn't likely to hurt much additionally.  Let's replace 'cpu' with
'pool' so that it reflects the current design.

* s/struct cpu_workqueue_struct/struct pool_workqueue/
* s/cpu_wq/pool_wq/
* s/cwq/pwq/

This patch is purely cosmetic.

Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
index 4e798e3..bf0e18b 100644
--- a/include/trace/events/workqueue.h
+++ b/include/trace/events/workqueue.h
@@ -27,7 +27,7 @@
 /**
  * workqueue_queue_work - called when a work gets queued
  * @req_cpu:	the requested cpu
- * @cwq:	pointer to struct cpu_workqueue_struct
+ * @pwq:	pointer to struct pool_workqueue
  * @work:	pointer to struct work_struct
  *
  * This event occurs when a work is queued immediately or once a
@@ -36,10 +36,10 @@
  */
 TRACE_EVENT(workqueue_queue_work,
 
-	TP_PROTO(unsigned int req_cpu, struct cpu_workqueue_struct *cwq,
+	TP_PROTO(unsigned int req_cpu, struct pool_workqueue *pwq,
 		 struct work_struct *work),
 
-	TP_ARGS(req_cpu, cwq, work),
+	TP_ARGS(req_cpu, pwq, work),
 
 	TP_STRUCT__entry(
 		__field( void *,	work	)
@@ -52,9 +52,9 @@
 	TP_fast_assign(
 		__entry->work		= work;
 		__entry->function	= work->func;
-		__entry->workqueue	= cwq->wq;
+		__entry->workqueue	= pwq->wq;
 		__entry->req_cpu	= req_cpu;
-		__entry->cpu		= cwq->pool->cpu;
+		__entry->cpu		= pwq->pool->cpu;
 	),
 
 	TP_printk("work struct=%p function=%pf workqueue=%p req_cpu=%u cpu=%u",