linux-kernel - [PATCH v4 2/7] sysfs: transparently handle const pointers in ATTRIBUTE

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Message-Id: <20251013-sysfs-const-attr-prep-v4-2-e0d36e828334@weissschuh.net>
Date: Mon, 13 Oct 2025 17:17:55 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>
Cc: linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v4 2/7] sysfs: transparently handle const pointers in
 ATTRIBUTE_GROUPS()

To ease the constification process of 'struct attribute', transparently
handle the const pointers in ATTRIBUTE_GROUPS(). A cast is used instead
of assigning to .attrs_new as it keeps the macro smaller. As both
members are aliased to each other the result is identical.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 include/linux/sysfs.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index e34d6af96abb..92f82cee5f11 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -287,7 +287,12 @@ static const struct attribute_group *_name##_groups[] = {	\

 #define ATTRIBUTE_GROUPS(_name)					\
 static const struct attribute_group _name##_group = {		\
-	.attrs = _name##_attrs,					\
+	.attrs = _Generic(_name##_attrs,			\
+			  struct attribute **:			\
+				_name##_attrs,			\
+			  const struct attribute *const *:	\
+				(void *)_name##_attrs		\
+	),							\
 };								\
 __ATTRIBUTE_GROUPS(_name)

-- 
2.51.0