md: Constify attribute_group structs

The attribute_group structs are never modified, they're only passed to
sysfs_create_group() and sysfs_remove_group(). Make them const to allow
the compiler to put them in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Song Liu <song@kernel.org>

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index ea3130e..e29c629 100644 (file)
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2616,7 +2616,7 @@ static struct attribute *md_bitmap_attrs[] = {
        &max_backlog_used.attr,
        NULL
 };
-struct attribute_group md_bitmap_group = {
+const struct attribute_group md_bitmap_group = {
        .name = "bitmap",
        .attrs = md_bitmap_attrs,
 };

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 843e136..32abcfb 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -785,7 +785,7 @@ out_free_new:
        return ERR_PTR(error);
 }
 
-static struct attribute_group md_redundancy_group;
+static const struct attribute_group md_redundancy_group;
 
 void mddev_unlock(struct mddev *mddev)
 {
@@ -802,7 +802,7 @@ void mddev_unlock(struct mddev *mddev)
                 * test it under the same mutex to ensure its correct value
                 * is seen.
                 */
-               struct attribute_group *to_remove = mddev->to_remove;
+               const struct attribute_group *to_remove = mddev->to_remove;
                mddev->to_remove = NULL;
                mddev->sysfs_active = 1;
                mutex_unlock(&mddev->reconfig_mutex);
@@ -5500,7 +5500,7 @@ static struct attribute *md_redundancy_attrs[] = {
        &md_degraded.attr,
        NULL,
 };
-static struct attribute_group md_redundancy_group = {
+static const struct attribute_group md_redundancy_group = {
        .name = NULL,
        .attrs = md_redundancy_attrs,
 };

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 4191f22..b9b7d2f 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -481,7 +481,7 @@ struct mddev {
        atomic_t                        max_corr_read_errors; /* max read retries */
        struct list_head                all_mddevs;
 
-       struct attribute_group          *to_remove;
+       const struct attribute_group    *to_remove;
 
        struct bio_set                  bio_set;
        struct bio_set                  sync_set; /* for sync operations like
@@ -613,7 +613,7 @@ struct md_sysfs_entry {
        ssize_t (*show)(struct mddev *, char *);
        ssize_t (*store)(struct mddev *, const char *, size_t);
 };
-extern struct attribute_group md_bitmap_group;
+extern const struct attribute_group md_bitmap_group;
 
 static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name)
 {

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f83623a..0ee9aa0 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6940,7 +6940,7 @@ static struct attribute *raid5_attrs[] =  {
        &ppl_write_hint.attr,
        NULL,
 };
-static struct attribute_group raid5_attrs_group = {
+static const struct attribute_group raid5_attrs_group = {
        .name = NULL,
        .attrs = raid5_attrs,
 };