linux-kernel - [PATCH] dm: Use vmalloc

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Message-Id: <20250805091448.124183-1-rongqianfeng@vivo.com>
Date: Tue,  5 Aug 2025 17:14:48 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH] dm: Use vmalloc_array to simplify code

Remove array_size() calls and replace vmalloc() with
vmalloc_array() to simplify the code.

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
 drivers/md/dm-cache-policy-smq.c | 2 +-
 drivers/md/dm-region-hash.c      | 2 +-
 drivers/md/dm-switch.c           | 4 ++--
 drivers/md/dm-thin.c             | 4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/md/dm-cache-policy-smq.c b/drivers/md/dm-cache-policy-smq.c
index 2ed894155cab..7e1e8cc0e33a 100644
--- a/drivers/md/dm-cache-policy-smq.c
+++ b/drivers/md/dm-cache-policy-smq.c
@@ -590,7 +590,7 @@ static int h_init(struct smq_hash_table *ht, struct entry_space *es, unsigned in
 	nr_buckets = roundup_pow_of_two(max(nr_entries / 4u, 16u));
 	ht->hash_bits = __ffs(nr_buckets);
 
-	ht->buckets = vmalloc(array_size(nr_buckets, sizeof(*ht->buckets)));
+	ht->buckets = vmalloc_array(nr_buckets, sizeof(*ht->buckets));
 	if (!ht->buckets)
 		return -ENOMEM;
 
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index a4550975c27d..e9b47b659976 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -206,7 +206,7 @@ struct dm_region_hash *dm_region_hash_create(
 	rh->shift = RH_HASH_SHIFT;
 	rh->prime = RH_HASH_MULT;
 
-	rh->buckets = vmalloc(array_size(nr_buckets, sizeof(*rh->buckets)));
+	rh->buckets = vmalloc_array(nr_buckets, sizeof(*rh->buckets));
 	if (!rh->buckets) {
 		DMERR("unable to allocate region hash bucket memory");
 		kfree(rh);
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c
index bb1a70b5a215..50a52ca50b34 100644
--- a/drivers/md/dm-switch.c
+++ b/drivers/md/dm-switch.c
@@ -114,8 +114,8 @@ static int alloc_region_table(struct dm_target *ti, unsigned int nr_paths)
 		return -EINVAL;
 	}
 
-	sctx->region_table = vmalloc(array_size(nr_slots,
-						sizeof(region_table_slot_t)));
+	sctx->region_table = vmalloc_array(nr_slots,
+					   sizeof(region_table_slot_t));
 	if (!sctx->region_table) {
 		ti->error = "Cannot allocate region table";
 		return -ENOMEM;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 007bb93e5fca..c84149ba4e38 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3031,8 +3031,8 @@ static struct pool *pool_create(struct mapped_device *pool_md,
 	}
 
 	pool->cell_sort_array =
-		vmalloc(array_size(CELL_SORT_ARRAY_SIZE,
-				   sizeof(*pool->cell_sort_array)));
+		vmalloc_array(CELL_SORT_ARRAY_SIZE,
+			      sizeof(*pool->cell_sort_array));
 	if (!pool->cell_sort_array) {
 		*error = "Error allocating cell sort array";
 		err_p = ERR_PTR(-ENOMEM);
-- 
2.34.1