[PATCH v2 2/3] block/blk-throttle: drop unneeded blk_stat_enable_accounting

[Khazhismel Kumykov <khazhy@chromium.org>]

From: Guenter Roeck <linux@roeck-us.net>

After the removal of CONFIG_BLK_DEV_THROTTLING_LOW, it is no longer
necessary to enable block accounting, so remove the call to
blk_stat_enable_accounting(). With that, the track_bio_latency variable
is no longer used and can be deleted from struct throtl_data. Also,
including blk-stat.h is no longer necessary.

Fixes: bf20ab538c81 ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
Cc: Yu Kuai <yukuai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
---
 block/blk-throttle.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index c19d052a8f2f..041bcf7b2c7c 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -12,7 +12,6 @@
 #include <linux/blktrace_api.h>
 #include "blk.h"
 #include "blk-cgroup-rwstat.h"
-#include "blk-stat.h"
 #include "blk-throttle.h"
 
 /* Max dispatch from a group in 1 round */
@@ -43,8 +42,6 @@ struct throtl_data
 
 	/* Work for dispatching throttled bios */
 	struct work_struct dispatch_work;
-
-	bool track_bio_latency;
 };
 
 static void throtl_pending_timer_fn(struct timer_list *t);
@@ -1340,9 +1337,6 @@ static int blk_throtl_init(struct gendisk *disk)
 	}
 
 	td->throtl_slice = DFL_THROTL_SLICE;
-	td->track_bio_latency = !queue_is_mq(q);
-	if (!td->track_bio_latency)
-		blk_stat_enable_accounting(q);
 
 out:
 	blk_mq_unquiesce_queue(disk->queue);
-- 
2.52.0.rc1.455.g30608eb744-goog