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nilfs2: Constify struct kobj_type

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'struct kobj_type' is not modified in this driver. It is only used with
kobject_init_and_add() which takes a "const struct kobj_type *" parameter.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  22403	   4184	     24	  26611	   67f3	fs/nilfs2/sysfs.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  22723	   3928	     24	  26675	   6833	fs/nilfs2/sysfs.o

Link: https://lkml.kernel.org/r/20240708143242.3296-1-konishi.ryusuke@gmail.com
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christophe JAILLET 2024-07-08 23:32:42 +09:00 committed by Andrew Morton
parent 0f3819e8c4
commit fbc8846cd9
1 changed files with 3 additions and 3 deletions
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6
fs/nilfs2/sysfs.c
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@ -56,7 +56,7 @@ static void nilfs_##name##_attr_release(struct kobject *kobj) \
sg_##name##_kobj); \
complete(&subgroups->sg_##name##_kobj_unregister); \
} \
static struct kobj_type nilfs_##name##_ktype = { \
static const struct kobj_type nilfs_##name##_ktype = { \
.default_groups = nilfs_##name##_groups, \
.sysfs_ops = &nilfs_##name##_attr_ops, \
.release = nilfs_##name##_attr_release, \
@ -166,7 +166,7 @@ static const struct sysfs_ops nilfs_snapshot_attr_ops = {
.store = nilfs_snapshot_attr_store,
};
static struct kobj_type nilfs_snapshot_ktype = {
static const struct kobj_type nilfs_snapshot_ktype = {
.default_groups = nilfs_snapshot_groups,
.sysfs_ops = &nilfs_snapshot_attr_ops,
.release = nilfs_snapshot_attr_release,
@ -967,7 +967,7 @@ static const struct sysfs_ops nilfs_dev_attr_ops = {
.store = nilfs_dev_attr_store,
};
static struct kobj_type nilfs_dev_ktype = {
static const struct kobj_type nilfs_dev_ktype = {
.default_groups = nilfs_dev_groups,
.sysfs_ops = &nilfs_dev_attr_ops,
.release = nilfs_dev_attr_release,