From 584afc86a1d44235ae4548d69efd40f649564233 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= <linux@weissschuh.net>
Date: Tue, 7 Jul 2026 18:56:35 +0200
Subject: [PATCH] samples/kobject: Constify kobject attributes
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Demonstrate that 'const struct kobj_attribute' is now supported by the
kobject core.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260707-sysfs-const-attr-kobj-attr-prep-v2-4-35ae1bc0f9ef@weissschuh.net
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 samples/kobject/kobject-example.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/samples/kobject/kobject-example.c b/samples/kobject/kobject-example.c
index 7404f310dc45..36f3fbc47fe0 100644
--- a/samples/kobject/kobject-example.c
+++ b/samples/kobject/kobject-example.c
@@ -25,13 +25,13 @@ static int bar;
 /*
  * The "foo" file where a static variable is read from and written to.
  */
-static ssize_t foo_show(struct kobject *kobj, struct kobj_attribute *attr,
+static ssize_t foo_show(struct kobject *kobj, const struct kobj_attribute *attr,
 			char *buf)
 {
 	return sysfs_emit(buf, "%d\n", foo);
 }
 
-static ssize_t foo_store(struct kobject *kobj, struct kobj_attribute *attr,
+static ssize_t foo_store(struct kobject *kobj, const struct kobj_attribute *attr,
 			 const char *buf, size_t count)
 {
 	int ret;
@@ -44,14 +44,14 @@ static ssize_t foo_store(struct kobject *kobj, struct kobj_attribute *attr,
 }
 
 /* Sysfs attributes cannot be world-writable. */
-static struct kobj_attribute foo_attribute =
+static const struct kobj_attribute foo_attribute =
 	__KOBJ_ATTR(foo, 0664, foo_show, foo_store);
 
 /*
  * More complex function where we determine which variable is being accessed by
  * looking at the attribute for the "baz" and "bar" files.
  */
-static ssize_t b_show(struct kobject *kobj, struct kobj_attribute *attr,
+static ssize_t b_show(struct kobject *kobj, const struct kobj_attribute *attr,
 		      char *buf)
 {
 	int var;
@@ -63,7 +63,7 @@ static ssize_t b_show(struct kobject *kobj, struct kobj_attribute *attr,
 	return sysfs_emit(buf, "%d\n", var);
 }
 
-static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr,
+static ssize_t b_store(struct kobject *kobj, const struct kobj_attribute *attr,
 		       const char *buf, size_t count)
 {
 	int var, ret;
@@ -79,9 +79,9 @@ static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr,
 	return count;
 }
 
-static struct kobj_attribute baz_attribute =
+static const struct kobj_attribute baz_attribute =
 	__KOBJ_ATTR(baz, 0664, b_show, b_store);
-static struct kobj_attribute bar_attribute =
+static const struct kobj_attribute bar_attribute =
 	__KOBJ_ATTR(bar, 0664, b_show, b_store);
 
 
@@ -89,7 +89,7 @@ static struct kobj_attribute bar_attribute =
  * Create a group of attributes so that we can create and destroy them all
  * at once.
  */
-static struct attribute *attrs[] = {
+static const struct attribute *const attrs[] = {
 	&foo_attribute.attr,
 	&baz_attribute.attr,
 	&bar_attribute.attr,
@@ -103,7 +103,7 @@ static struct attribute *attrs[] = {
  * attribute group.
  */
 static const struct attribute_group attr_group = {
-	.attrs = attrs,
+	.attrs_const = attrs,
 };
 
 static struct kobject *example_kobj;