linux-kernel - [PATCH 2/2] driver core: class: warn if a compatibility class is registered

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Message-ID: <7bc5fa50-59f6-4455-8f77-1c89f1e17d0b@gmail.com>
Date: Mon, 2 Sep 2024 21:02:17 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Wolfram Sang <wsa@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] driver core: class: warn if a compatibility class is
 registered

Kernel doc for this function states:
"Compatibility class are meant as a temporary user-space compatibility
workaround when converting a family of class devices to a bus devices."

Therefore remind any potential user of the old ABI that support for it
will be dropped soon.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/base/class.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 7b38fdf8e..f12a43736 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -556,6 +556,9 @@ struct class_compat *class_compat_register(const char *name)
 {
 	struct class_compat *cls;

+	pr_warn("Compatibility class %s will go away soon, please migrate userspace tools to use bus devices\n",
+		name);
+
 	cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL);
 	if (!cls)
 		return NULL;
-- 
2.46.0