[PATCH 5/6] block: remove the discard_alignment flag

[Christoph Hellwig <hch@lst.de>]

queue_limits.discard_alignment is never read except in the places
where it is stacked into another limit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-settings.c         | 10 ----------
 drivers/md/dm-cache-target.c |  1 -
 drivers/md/dm-clone-target.c |  1 -
 drivers/md/dm-table.c        |  1 -
 include/linux/blkdev.h       |  1 -
 5 files changed, 14 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index a1b10404e500bc..62588d9a38e39a 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -578,16 +578,6 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 	if (b->discard_granularity) {
 		alignment = queue_limit_discard_alignment(b, start);
 
-		if (t->discard_granularity != 0 &&
-		    t->discard_alignment != alignment) {
-			top = t->discard_granularity + t->discard_alignment;
-			bottom = b->discard_granularity + alignment;
-
-			/* Verify that top and bottom intervals line up */
-			if ((max(top, bottom) % min(top, bottom)) != 0)
-				t->discard_misaligned = 1;
-		}
-
 		t->max_discard_sectors = min_not_zero(t->max_discard_sectors,
 						      b->max_discard_sectors);
 		t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors,
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 16884b5850532f..2d8dd9283ff4cf 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3403,7 +3403,6 @@ static void set_discard_limits(struct cache *cache, struct queue_limits *limits)
 	limits->max_hw_discard_sectors = origin_limits->max_hw_discard_sectors;
 	limits->discard_granularity = origin_limits->discard_granularity;
 	limits->discard_alignment = origin_limits->discard_alignment;
-	limits->discard_misaligned = origin_limits->discard_misaligned;
 }
 
 static void cache_io_hints(struct dm_target *ti, struct queue_limits *limits)
diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c
index ad79b52ffc1434..b4384a8b13e360 100644
--- a/drivers/md/dm-clone-target.c
+++ b/drivers/md/dm-clone-target.c
@@ -2059,7 +2059,6 @@ static void set_discard_limits(struct clone *clone, struct queue_limits *limits)
 	limits->max_hw_discard_sectors = dest_limits->max_hw_discard_sectors;
 	limits->discard_granularity = dest_limits->discard_granularity;
 	limits->discard_alignment = dest_limits->discard_alignment;
-	limits->discard_misaligned = dest_limits->discard_misaligned;
 	limits->max_discard_segments = dest_limits->max_discard_segments;
 }
 
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index df6313c3fe6ba4..502ebc78d490f6 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1808,7 +1808,6 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 		limits->max_hw_discard_sectors = 0;
 		limits->discard_granularity = 0;
 		limits->discard_alignment = 0;
-		limits->discard_misaligned = 0;
 	}
 
 	if (!dm_table_supports_write_zeroes(t))
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7ad2b1240fc0bf..86410ce41bf60e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -377,7 +377,6 @@ struct queue_limits {
 	unsigned short		max_integrity_segments;
 	unsigned short		max_discard_segments;
 
-	unsigned char		discard_misaligned;
 	unsigned char		raid_partial_stripes_expensive;
 	unsigned int		max_open_zones;
 	unsigned int		max_active_zones;
-- 
2.43.0