The patch titled
Subject: nilfs2: Constify struct kobj_type
has been added to the -mm mm-nonmm-unstable branch. Its filename is
nilfs2-constify-struct-kobj_type.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nilfs2-constify-struct-kobj_type.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Subject: nilfs2: Constify struct kobj_type
Date: Mon, 8 Jul 2024 23:32:42 +0900
'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@xxxxxxxxx
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nilfs2/sysfs.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/fs/nilfs2/sysfs.c~nilfs2-constify-struct-kobj_type
+++ a/fs/nilfs2/sysfs.c
@@ -56,7 +56,7 @@ static void nilfs_##name##_attr_release(
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_snap
.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_
.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,
_
Patches currently in -mm which might be from christophe.jaillet@xxxxxxxxxx are
nilfs2-constify-struct-kobj_type.patch
