blktrace: from-sector redundant in trace_block_remap

Remove redundant from-sector parameter: it's /always/ the bio's sector
passed in.

[ Impact: cleanup ]
Signed-off-by: NAlan D. Brunelle <alan.brunelle@hp.com>
Reviewed-by: NLi Zefan <lizf@cn.fujitsu.com>
Reviewed-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <49FF517C.7000503@hp.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

block/blk-core.c

@@ -1275,7 +1275,7 @@ static inline void blk_partition_remap(struct bio *bio)
 		bio->bi_bdev = bdev->bd_contains;
 
 		trace_block_remap(bdev_get_queue(bio->bi_bdev), bio,
-				    bdev->bd_dev, bio->bi_sector,
+				    bdev->bd_dev,
 				    bio->bi_sector - p->start_sect);
 	}
 }
@@ -1444,8 +1444,7 @@ static inline void __generic_make_request(struct bio *bio)
 			goto end_io;
 
 		if (old_sector != -1)
-			trace_block_remap(q, bio, old_dev, bio->bi_sector,
-					    old_sector);
+			trace_block_remap(q, bio, old_dev, old_sector);
 
 		trace_block_bio_queue(q, bio);
 

drivers/md/dm.c

@@ -657,8 +657,7 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
 		/* the bio has been remapped so dispatch it */
 
 		trace_block_remap(bdev_get_queue(clone->bi_bdev), clone,
-				    tio->io->bio->bi_bdev->bd_dev,
-				    clone->bi_sector, sector);
+				    tio->io->bio->bi_bdev->bd_dev, sector);
 
 		generic_make_request(clone);
 	} else if (r < 0 || r == DM_MAPIO_REQUEUE) {

include/trace/block.h

@@ -70,7 +70,7 @@ DECLARE_TRACE(block_split,
 
 DECLARE_TRACE(block_remap,
 	TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
-		 sector_t to, sector_t from),
-	      TP_ARGS(q, bio, dev, to, from));
+		 sector_t to),
+	      TP_ARGS(q, bio, dev, to));
 
 #endif

kernel/trace/blktrace.c

@@ -830,7 +830,6 @@ static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
  * @q:		queue the io is for
  * @bio:	the source bio
  * @dev:	target device
- * @to:		target sector
  * @from:	source sector
  *
  * Description:
@@ -839,7 +838,7 @@ static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
  *
  **/
 static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
-				       dev_t dev, sector_t to, sector_t from)
+				       dev_t dev, sector_t from)
 {
 	struct blk_trace *bt = q->blk_trace;
 	struct blk_io_trace_remap r;
@@ -851,8 +850,9 @@ static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
 	r.device_to   = cpu_to_be32(bio->bi_bdev->bd_dev);
 	r.sector_from = cpu_to_be64(from);
 
-	__blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP,
-			!bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
+	__blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
+			BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE),
+			sizeof(r), &r);
 }
 
 /**