From:   =?utf-8?q?Thomas_Wei=C3=9Fschuh?= <linux@weissschuh.net>
Date:   Wed, 08 Feb 2023 04:01:22 +0000
Subject: [PATCH] block: make kobj_type structures constant
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Message-Id: <20230208-kobj_type-block-v1-1-0b3eafd7d983@weissschuh.net>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        =?utf-8?q?Thomas_Wei=C3=9Fschuh?= <linux@weissschuh.net>
Precedence: bulk

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definitions to prevent
modification at runtime.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
 block/blk-crypto-sysfs.c | 2 +-
 block/blk-ia-ranges.c    | 4 ++--
 block/blk-integrity.c    | 2 +-
 block/blk-mq-sysfs.c     | 6 +++---
 block/blk-sysfs.c        | 2 +-
 block/elevator.c         | 4 ++--
 6 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/block/blk-crypto-sysfs.c b/block/blk-crypto-sysfs.c
index 55268edc0625..a304434489ba 100644
--- a/block/blk-crypto-sysfs.c
+++ b/block/blk-crypto-sysfs.c
@@ -116,7 +116,7 @@ static void blk_crypto_release(struct kobject *kobj)
 	kfree(container_of(kobj, struct blk_crypto_kobj, kobj));
 }
 
-static struct kobj_type blk_crypto_ktype = {
+static const struct kobj_type blk_crypto_ktype = {
 	.default_groups = blk_crypto_attr_groups,
 	.sysfs_ops	= &blk_crypto_attr_ops,
 	.release	= blk_crypto_release,
diff --git a/block/blk-ia-ranges.c b/block/blk-ia-ranges.c
index 2141931ddd37..c9eb4241e048 100644
--- a/block/blk-ia-ranges.c
+++ b/block/blk-ia-ranges.c
@@ -75,7 +75,7 @@ static void blk_ia_range_sysfs_nop_release(struct kobject *kobj)
 {
 }
 
-static struct kobj_type blk_ia_range_ktype = {
+static const struct kobj_type blk_ia_range_ktype = {
 	.sysfs_ops	= &blk_ia_range_sysfs_ops,
 	.default_groups	= blk_ia_range_groups,
 	.release	= blk_ia_range_sysfs_nop_release,
@@ -94,7 +94,7 @@ static void blk_ia_ranges_sysfs_release(struct kobject *kobj)
 	kfree(iars);
 }
 
-static struct kobj_type blk_ia_ranges_ktype = {
+static const struct kobj_type blk_ia_ranges_ktype = {
 	.release	= blk_ia_ranges_sysfs_release,
 };
 
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 69eed260a823..8f01d786f5cb 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -356,7 +356,7 @@ static const struct sysfs_ops integrity_ops = {
 	.store	= &integrity_attr_store,
 };
 
-static struct kobj_type integrity_ktype = {
+static const struct kobj_type integrity_ktype = {
 	.default_groups = integrity_groups,
 	.sysfs_ops	= &integrity_ops,
 };
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 4515288fbe35..a8f4accb6646 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -153,15 +153,15 @@ static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
 	.store	= blk_mq_hw_sysfs_store,
 };
 
-static struct kobj_type blk_mq_ktype = {
+static const struct kobj_type blk_mq_ktype = {
 	.release	= blk_mq_sysfs_release,
 };
 
-static struct kobj_type blk_mq_ctx_ktype = {
+static const struct kobj_type blk_mq_ctx_ktype = {
 	.release	= blk_mq_ctx_sysfs_release,
 };
 
-static struct kobj_type blk_mq_hw_ktype = {
+static const struct kobj_type blk_mq_hw_ktype = {
 	.sysfs_ops	= &blk_mq_hw_sysfs_ops,
 	.default_groups = default_hw_ctx_groups,
 	.release	= blk_mq_hw_sysfs_release,
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 93d9e9c9a6ea..0f5798883776 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -755,7 +755,7 @@ static void blk_queue_release(struct kobject *kobj)
 	/* nothing to do here, all data is associated with the parent gendisk */
 }
 
-static struct kobj_type blk_queue_ktype = {
+static const struct kobj_type blk_queue_ktype = {
 	.default_groups = blk_queue_attr_groups,
 	.sysfs_ops	= &queue_sysfs_ops,
 	.release	= blk_queue_release,
diff --git a/block/elevator.c b/block/elevator.c
index adee58e48e2d..24909069f872 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -126,7 +126,7 @@ static struct elevator_type *elevator_find_get(struct request_queue *q,
 	return e;
 }
 
-static struct kobj_type elv_ktype;
+static const struct kobj_type elv_ktype;
 
 struct elevator_queue *elevator_alloc(struct request_queue *q,
 				  struct elevator_type *e)
@@ -455,7 +455,7 @@ static const struct sysfs_ops elv_sysfs_ops = {
 	.store	= elv_attr_store,
 };
 
-static struct kobj_type elv_ktype = {
+static const struct kobj_type elv_ktype = {
 	.sysfs_ops	= &elv_sysfs_ops,
 	.release	= elevator_release,
 };

---
base-commit: 0983f6bf2bfc0789b51ddf7315f644ff4da50acb
change-id: 20230208-kobj_type-block-f2cd53bfe22d

Best regards,
-- 
Thomas Weißschuh <linux@weissschuh.net>