linux-kernel - [PATCH] livepatch: Make kobj

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Date:   Fri, 17 Feb 2023 03:14:41 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] livepatch: Make kobj_type structures constant

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@...ssschuh.net>
---
 kernel/livepatch/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 201f0c0482fb..3da548755d8a 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -581,7 +581,7 @@ static void klp_kobj_release_patch(struct kobject *kobj)
 	complete(&patch->finish);
 }
 
-static struct kobj_type klp_ktype_patch = {
+static const struct kobj_type klp_ktype_patch = {
 	.release = klp_kobj_release_patch,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = klp_patch_groups,
@@ -597,7 +597,7 @@ static void klp_kobj_release_object(struct kobject *kobj)
 		klp_free_object_dynamic(obj);
 }
 
-static struct kobj_type klp_ktype_object = {
+static const struct kobj_type klp_ktype_object = {
 	.release = klp_kobj_release_object,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = klp_object_groups,
@@ -613,7 +613,7 @@ static void klp_kobj_release_func(struct kobject *kobj)
 		klp_free_func_nop(func);
 }
 
-static struct kobj_type klp_ktype_func = {
+static const struct kobj_type klp_ktype_func = {
 	.release = klp_kobj_release_func,
 	.sysfs_ops = &kobj_sysfs_ops,
 };

---
base-commit: 3ac88fa4605ec98e545fb3ad0154f575fda2de5f
change-id: 20230217-kobj_type-livepatch-74ddff6d453f

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