linux-kernel - [PATCH] input: make input

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Message-Id: <20240305-class_cleanup-input-v1-1-0c3d950c25db@marliere.net>
Date: Tue, 05 Mar 2024 16:42:13 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] input: make input_class constant

Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the input_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/input/input.c | 2 +-
 include/linux/input.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index de7884a5be39..711485437567 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1918,7 +1918,7 @@ static char *input_devnode(const struct device *dev, umode_t *mode)
 	return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
 }

-struct class input_class = {
+const struct class input_class = {
 	.name		= "input",
 	.devnode	= input_devnode,
 };
diff --git a/include/linux/input.h b/include/linux/input.h
index de6503c0edb8..c22ac465254b 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -514,7 +514,7 @@ void input_enable_softrepeat(struct input_dev *dev, int delay, int period);

 bool input_device_enabled(struct input_dev *dev);

-extern struct class input_class;
+extern const struct class input_class;

 /**
  * struct ff_device - force-feedback part of an input device

---
base-commit: b0f3f9ab419c243389da6c0dd6a9db0eea560146
change-id: 20240305-class_cleanup-input-f85c876bee8c

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>