linux-kernel - [PATCH] mtd: ubi: make ubi

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Message-Id: <20240305-class_cleanup-mtd-v1-1-7861914e2218@marliere.net>
Date: Tue, 05 Mar 2024 16:35:38 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Richard Weinberger <richard@....at>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] mtd: ubi: make ubi_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 ubi_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/mtd/ubi/build.c | 2 +-
 drivers/mtd/ubi/ubi.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 7d4ff1193db6..1938b61e1b74 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -111,7 +111,7 @@ static struct attribute *ubi_class_attrs[] = {
 ATTRIBUTE_GROUPS(ubi_class);

 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
-struct class ubi_class = {
+const struct class ubi_class = {
 	.name		= UBI_NAME_STR,
 	.class_groups	= ubi_class_groups,
 };
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 0b42bb45dd84..21c3208a9210 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -812,7 +812,7 @@ extern struct kmem_cache *ubi_wl_entry_slab;
 extern const struct file_operations ubi_ctrl_cdev_operations;
 extern const struct file_operations ubi_cdev_operations;
 extern const struct file_operations ubi_vol_cdev_operations;
-extern struct class ubi_class;
+extern const struct class ubi_class;
 extern struct mutex ubi_devices_mutex;
 extern struct blocking_notifier_head ubi_notifiers;

---
base-commit: 77bf032528393d2dc9430b3cea1fee8d0762a86f
change-id: 20240305-class_cleanup-mtd-b7dfe2ea8c26

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