[PATCH 1/2] tty: vt: make vtconsole_class constant

[PATCH 1/2] tty: vt: make vtconsole_class constant

[Greg Kroah-Hartman]

Now that the driver core allows for struct class to be in read-only
memory, making all 'class' structures to be declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at load time.

Cc: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/vt/vt.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 5c47f77804f0..7659b92db631 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3565,7 +3565,9 @@ int __init vty_init(const struct file_operations *console_fops)
 	return 0;
 }
 
-static struct class *vtconsole_class;
+static const struct class vtconsole_class = {
+	.name = "vtconsole",
+};
 
 static int do_bind_con_driver(const struct consw *csw, int first, int last,
 			   int deflt)
@@ -4092,7 +4094,7 @@ static int do_register_con_driver(const struct consw *csw, int first, int last)
 		goto err;
 
 	con_driver->dev =
-		device_create_with_groups(vtconsole_class, NULL,
+		device_create_with_groups(&vtconsole_class, NULL,
 					  MKDEV(0, con_driver->node),
 					  con_driver, con_dev_groups,
 					  "vtcon%i", con_driver->node);
@@ -4173,7 +4175,7 @@ static void con_driver_unregister_callback(struct work_struct *ignored)
 		console_unlock();
 
 		vtconsole_deinit_device(con_driver);
-		device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
+		device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
 
 		console_lock();
 
@@ -4234,12 +4236,9 @@ static int __init vtconsole_class_init(void)
 {
 	int i;
 
-	vtconsole_class = class_create("vtconsole");
-	if (IS_ERR(vtconsole_class)) {
-		pr_warn("Unable to create vt console class; errno = %ld\n",
-			PTR_ERR(vtconsole_class));
-		vtconsole_class = NULL;
-	}
+	i = class_register(&vtconsole_class);
+	if (i)
+		pr_warn("Unable to create vt console class; errno = %d\n", i);
 
 	/* Add system drivers to sysfs */
 	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
@@ -4247,7 +4246,7 @@ static int __init vtconsole_class_init(void)
 
 		if (con->con && !con->dev) {
 			con->dev =
-				device_create_with_groups(vtconsole_class, NULL,
+				device_create_with_groups(&vtconsole_class, NULL,
 							  MKDEV(0, con->node),
 							  con, con_dev_groups,
 							  "vtcon%i", con->node);
-- 
2.42.0

[PATCH 2/2] tty: vc_screen: make vc_class constant

[Greg Kroah-Hartman]

Now that the driver core allows for struct class to be in read-only
memory, making all 'class' structures to be declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at load time.

Cc: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/vt/vc_screen.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
index 829c4be66f3b..b16ea517bb17 100644
--- a/drivers/tty/vt/vc_screen.c
+++ b/drivers/tty/vt/vc_screen.c
@@ -786,23 +786,22 @@ static const struct file_operations vcs_fops = {
 	.release	= vcs_release,
 };
 
-static struct class *vc_class;
+static const struct class vc_class = {
+	.name = "vc",
+};
 
 void vcs_make_sysfs(int index)
 {
-	device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL,
-		      "vcs%u", index + 1);
-	device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 65), NULL,
-		      "vcsu%u", index + 1);
-	device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL,
-		      "vcsa%u", index + 1);
+	device_create(&vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL, "vcs%u", index + 1);
+	device_create(&vc_class, NULL, MKDEV(VCS_MAJOR, index + 65), NULL, "vcsu%u", index + 1);
+	device_create(&vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL, "vcsa%u", index + 1);
 }
 
 void vcs_remove_sysfs(int index)
 {
-	device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 1));
-	device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 65));
-	device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 129));
+	device_destroy(&vc_class, MKDEV(VCS_MAJOR, index + 1));
+	device_destroy(&vc_class, MKDEV(VCS_MAJOR, index + 65));
+	device_destroy(&vc_class, MKDEV(VCS_MAJOR, index + 129));
 }
 
 int __init vcs_init(void)
@@ -811,11 +810,12 @@ int __init vcs_init(void)
 
 	if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops))
 		panic("unable to get major %d for vcs device", VCS_MAJOR);
-	vc_class = class_create("vc");
+	if (class_register(&vc_class))
+		panic("unable to create vc_class");
 
-	device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs");
-	device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 64), NULL, "vcsu");
-	device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa");
+	device_create(&vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs");
+	device_create(&vc_class, NULL, MKDEV(VCS_MAJOR, 64), NULL, "vcsu");
+	device_create(&vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa");
 	for (i = 0; i < MIN_NR_CONSOLES; i++)
 		vcs_make_sysfs(i);
 	return 0;
-- 
2.42.0

Re: [PATCH 2/2] tty: vc_screen: make vc_class constant

[Jiri Slaby]

On 05. 10. 23, 15:33, Greg Kroah-Hartman wrote:
> Now that the driver core allows for struct class to be in read-only
> memory, making all 'class' structures to be declared at build time
> placing them into read-only memory, instead of having to be dynamically
> allocated at load time.
> 
> Cc: Jiri Slaby <jirislaby@kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>   drivers/tty/vt/vc_screen.c | 28 ++++++++++++++--------------
>   1 file changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
> index 829c4be66f3b..b16ea517bb17 100644
> --- a/drivers/tty/vt/vc_screen.c
> +++ b/drivers/tty/vt/vc_screen.c
...
> @@ -811,11 +810,12 @@ int __init vcs_init(void)
>   
>   	if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops))
>   		panic("unable to get major %d for vcs device", VCS_MAJOR);
> -	vc_class = class_create("vc");
> +	if (class_register(&vc_class))
> +		panic("unable to create vc_class");

FWIW it's no longer "create". Now it's "register".

Anyway, for the sake of archives:
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>

regards,
-- 
js
suse labs