block: make queue_sysfs_entry instances const

The queue_sysfs_entry structures are never modified, mark them as const.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Link: https://patch.msgid.link/20260316-b4-sysfs-const-attr-block-v1-1-a35d73b986b0@weissschuh.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: t-8ch

block/blk-sysfs.c

@@ -581,27 +581,27 @@ static int queue_wc_store(struct gendisk *disk, const char *page,
 	return 0;
 }
 
-#define QUEUE_RO_ENTRY(_prefix, _name)			\
-static struct queue_sysfs_entry _prefix##_entry = {	\
-	.attr	= { .name = _name, .mode = 0444 },	\
-	.show	= _prefix##_show,			\
+#define QUEUE_RO_ENTRY(_prefix, _name)				\
+static const struct queue_sysfs_entry _prefix##_entry = {	\
+	.attr	= { .name = _name, .mode = 0444 },		\
+	.show	= _prefix##_show,				\
 };
 
-#define QUEUE_RW_ENTRY(_prefix, _name)			\
-static struct queue_sysfs_entry _prefix##_entry = {	\
-	.attr	= { .name = _name, .mode = 0644 },	\
-	.show	= _prefix##_show,			\
-	.store	= _prefix##_store,			\
+#define QUEUE_RW_ENTRY(_prefix, _name)				\
+static const struct queue_sysfs_entry _prefix##_entry = {	\
+	.attr	= { .name = _name, .mode = 0644 },		\
+	.show	= _prefix##_show,				\
+	.store	= _prefix##_store,				\
 };
 
 #define QUEUE_LIM_RO_ENTRY(_prefix, _name)			\
-static struct queue_sysfs_entry _prefix##_entry = {	\
+static const struct queue_sysfs_entry _prefix##_entry = {	\
 	.attr		= { .name = _name, .mode = 0444 },	\
 	.show_limit	= _prefix##_show,			\
 }
 
 #define QUEUE_LIM_RW_ENTRY(_prefix, _name)			\
-static struct queue_sysfs_entry _prefix##_entry = {	\
+static const struct queue_sysfs_entry _prefix##_entry = {	\
 	.attr		= { .name = _name, .mode = 0644 },	\
 	.show_limit	= _prefix##_show,			\
 	.store_limit	= _prefix##_store,			\
@@ -665,7 +665,7 @@ QUEUE_LIM_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask");
 QUEUE_LIM_RO_ENTRY(queue_dma_alignment, "dma_alignment");
 
 /* legacy alias for logical_block_size: */
-static struct queue_sysfs_entry queue_hw_sector_size_entry = {
+static const struct queue_sysfs_entry queue_hw_sector_size_entry = {
 	.attr		= {.name = "hw_sector_size", .mode = 0444 },
 	.show_limit	= queue_logical_block_size_show,
 };
@@ -731,7 +731,7 @@ QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
 #endif
 
 /* Common attributes for bio-based and request-based queues. */
-static struct attribute *queue_attrs[] = {
+static const struct attribute *const queue_attrs[] = {
 	/*
 	 * Attributes which are protected with q->limits_lock.
 	 */
@@ -791,7 +791,7 @@ static struct attribute *queue_attrs[] = {
 };
 
 /* Request-based queue attributes that are not relevant for bio-based queues. */
-static struct attribute *blk_mq_queue_attrs[] = {
+static const struct attribute *const blk_mq_queue_attrs[] = {
 	/*
 	 * Attributes which require some form of locking other than
 	 * q->sysfs_lock.
@@ -811,7 +811,7 @@ static struct attribute *blk_mq_queue_attrs[] = {
 	NULL,
 };
 
-static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
+static umode_t queue_attr_visible(struct kobject *kobj, const struct attribute *attr,
 				int n)
 {
 	struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
@@ -827,7 +827,7 @@ static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
 }
 
 static umode_t blk_mq_queue_attr_visible(struct kobject *kobj,
-					 struct attribute *attr, int n)
+					 const struct attribute *attr, int n)
 {
 	struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
 	struct request_queue *q = disk->queue;
@@ -841,17 +841,17 @@ static umode_t blk_mq_queue_attr_visible(struct kobject *kobj,
 	return attr->mode;
 }
 
-static struct attribute_group queue_attr_group = {
-	.attrs = queue_attrs,
-	.is_visible = queue_attr_visible,
+static const struct attribute_group queue_attr_group = {
+	.attrs_const = queue_attrs,
+	.is_visible_const = queue_attr_visible,
 };
 
-static struct attribute_group blk_mq_queue_attr_group = {
-	.attrs = blk_mq_queue_attrs,
-	.is_visible = blk_mq_queue_attr_visible,
+static const struct attribute_group blk_mq_queue_attr_group = {
+	.attrs_const = blk_mq_queue_attrs,
+	.is_visible_const = blk_mq_queue_attr_visible,
 };
 
-#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
+#define to_queue(atr) container_of_const((atr), struct queue_sysfs_entry, attr)
 
 static ssize_t
 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)