linux-kernel - [BLOCK] remove-kblockd_flush

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Date:	Sun, 16 Nov 2008 17:31:08 +0800
From:	crquan@...il.com
To:	Jens Axboe <jens.axboe@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...sign.ru>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org
Subject: [BLOCK] remove-kblockd_flush_work.patch

From: Cheng Renquan <crquan@...il.com>

After many improvements on kblockd_flush_work, it is now identical to
cancel_work_sync, so a direct call to cancel_work_sync is suggested.

The only difference is that cancel_work_sync is a GPL symbol,
so no non-GPL modules anymore.

Signed-off-by: Cheng Renquan <crquan@...il.com>

---

Index: linux-2.6.28-rc5/block/as-iosched.c
===================================================================
--- linux-2.6.28-rc5.orig/block/as-iosched.c
+++ linux-2.6.28-rc5/block/as-iosched.c
@@ -1344,7 +1344,7 @@ static void as_exit_queue(elevator_t *e)
 	struct as_data *ad = e->elevator_data;
 
 	del_timer_sync(&ad->antic_timer);
-	kblockd_flush_work(&ad->antic_work);
+	cancel_work_sync(&ad->antic_work);
 
 	BUG_ON(!list_empty(&ad->fifo_list[REQ_SYNC]));
 	BUG_ON(!list_empty(&ad->fifo_list[REQ_ASYNC]));
Index: linux-2.6.28-rc5/block/blk-core.c
===================================================================
--- linux-2.6.28-rc5.orig/block/blk-core.c
+++ linux-2.6.28-rc5/block/blk-core.c
@@ -396,7 +396,7 @@ EXPORT_SYMBOL(blk_stop_queue);
 void blk_sync_queue(struct request_queue *q)
 {
 	del_timer_sync(&q->unplug_timer);
-	kblockd_flush_work(&q->unplug_work);
+	cancel_work_sync(&q->unplug_work);
 }
 EXPORT_SYMBOL(blk_sync_queue);
 
@@ -2113,12 +2113,6 @@ int kblockd_schedule_work(struct request
 }
 EXPORT_SYMBOL(kblockd_schedule_work);
 
-void kblockd_flush_work(struct work_struct *work)
-{
-	cancel_work_sync(work);
-}
-EXPORT_SYMBOL(kblockd_flush_work);
-
 int __init blk_dev_init(void)
 {
 	kblockd_workqueue = create_workqueue("kblockd");
Index: linux-2.6.28-rc5/block/cfq-iosched.c
===================================================================
--- linux-2.6.28-rc5.orig/block/cfq-iosched.c
+++ linux-2.6.28-rc5/block/cfq-iosched.c
@@ -2160,7 +2160,7 @@ out_cont:
 static void cfq_shutdown_timer_wq(struct cfq_data *cfqd)
 {
 	del_timer_sync(&cfqd->idle_slice_timer);
-	kblockd_flush_work(&cfqd->unplug_work);
+	cancel_work_sync(&cfqd->unplug_work);
 }
 
 static void cfq_put_async_queues(struct cfq_data *cfqd)
Index: linux-2.6.28-rc5/include/linux/blkdev.h
===================================================================
--- linux-2.6.28-rc5.orig/include/linux/blkdev.h
+++ linux-2.6.28-rc5/include/linux/blkdev.h
@@ -977,7 +977,6 @@ static inline void put_dev_sector(Sector
 
 struct work_struct;
 int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
-void kblockd_flush_work(struct work_struct *work);
 
 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
 	MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
--
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