diff mbox series

accel: make accel_class a static const structure

Message ID 20230620182528.669526-2-gregkh@linuxfoundation.org (mailing list archive)
State New, archived
Headers show
Series accel: make accel_class a static const structure | expand

Commit Message

Greg Kroah-Hartman June 20, 2023, 6:25 p.m. UTC 
From: Ivan Orlov <ivan.orlov0322@gmail.com>

Now that the driver core allows for struct class to be in read-only
memory, move the accel_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: Oded Gabbay <ogabbay@kernel.org>
Cc: dri-devel@lists.freedesktop.org
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/accel/drm_accel.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

Comments

Tomer Tayar July 3, 2023, 12:09 p.m. UTC | #1 
On 20/06/2023 21:25, Greg Kroah-Hartman wrote:
> From: Ivan Orlov <ivan.orlov0322@gmail.com>
>
> Now that the driver core allows for struct class to be in read-only
> memory, move the accel_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: Oded Gabbay <ogabbay@kernel.org>
> Cc: dri-devel@lists.freedesktop.org
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Reviewed-by: Tomer Tayar <ttayar@habana.ai>

Thanks,
Tomer

> ---
>   drivers/accel/drm_accel.c | 21 ++++++++-------------
>   1 file changed, 8 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
> index 4a9baf02439e..2dc187e1ee41 100644
> --- a/drivers/accel/drm_accel.c
> +++ b/drivers/accel/drm_accel.c
> @@ -21,7 +21,6 @@ static DEFINE_SPINLOCK(accel_minor_lock);
>   static struct idr accel_minors_idr;
>   
>   static struct dentry *accel_debugfs_root;
> -static struct class *accel_class;
>   
>   static struct device_type accel_sysfs_device_minor = {
>   	.name = "accel_minor"
> @@ -32,23 +31,19 @@ static char *accel_devnode(const struct device *dev, umode_t *mode)
>   	return kasprintf(GFP_KERNEL, "accel/%s", dev_name(dev));
>   }
>   
> +static const struct class accel_class = {
> +	.name = "accel",
> +	.devnode = accel_devnode,
> +};
> +
>   static int accel_sysfs_init(void)
>   {
> -	accel_class = class_create("accel");
> -	if (IS_ERR(accel_class))
> -		return PTR_ERR(accel_class);
> -
> -	accel_class->devnode = accel_devnode;
> -
> -	return 0;
> +	return class_register(&accel_class);
>   }
>   
>   static void accel_sysfs_destroy(void)
>   {
> -	if (IS_ERR_OR_NULL(accel_class))
> -		return;
> -	class_destroy(accel_class);
> -	accel_class = NULL;
> +	class_unregister(&accel_class);
>   }
>   
>   static int accel_name_info(struct seq_file *m, void *data)
> @@ -116,7 +111,7 @@ void accel_debugfs_init(struct drm_minor *minor, int minor_id)
>   void accel_set_device_instance_params(struct device *kdev, int index)
>   {
>   	kdev->devt = MKDEV(ACCEL_MAJOR, index);
> -	kdev->class = accel_class;
> +	kdev->class = &accel_class;
>   	kdev->type = &accel_sysfs_device_minor;
>   }
>
Oded Gabbay July 3, 2023, 12:27 p.m. UTC | #2 
On Mon, Jul 3, 2023 at 3:09 PM Tomer Tayar <ttayar@habana.ai> wrote:
>
> On 20/06/2023 21:25, Greg Kroah-Hartman wrote:
> > From: Ivan Orlov <ivan.orlov0322@gmail.com>
> >
> > Now that the driver core allows for struct class to be in read-only
> > memory, move the accel_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: Oded Gabbay <ogabbay@kernel.org>
> > Cc: dri-devel@lists.freedesktop.org
> > Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
> Reviewed-by: Tomer Tayar <ttayar@habana.ai>
Thanks Tomer.
Applied to habanalabs-next for 6.6.
Oded
>
> Thanks,
> Tomer
>
> > ---
> >   drivers/accel/drm_accel.c | 21 ++++++++-------------
> >   1 file changed, 8 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
> > index 4a9baf02439e..2dc187e1ee41 100644
> > --- a/drivers/accel/drm_accel.c
> > +++ b/drivers/accel/drm_accel.c
> > @@ -21,7 +21,6 @@ static DEFINE_SPINLOCK(accel_minor_lock);
> >   static struct idr accel_minors_idr;
> >
> >   static struct dentry *accel_debugfs_root;
> > -static struct class *accel_class;
> >
> >   static struct device_type accel_sysfs_device_minor = {
> >       .name = "accel_minor"
> > @@ -32,23 +31,19 @@ static char *accel_devnode(const struct device *dev, umode_t *mode)
> >       return kasprintf(GFP_KERNEL, "accel/%s", dev_name(dev));
> >   }
> >
> > +static const struct class accel_class = {
> > +     .name = "accel",
> > +     .devnode = accel_devnode,
> > +};
> > +
> >   static int accel_sysfs_init(void)
> >   {
> > -     accel_class = class_create("accel");
> > -     if (IS_ERR(accel_class))
> > -             return PTR_ERR(accel_class);
> > -
> > -     accel_class->devnode = accel_devnode;
> > -
> > -     return 0;
> > +     return class_register(&accel_class);
> >   }
> >
> >   static void accel_sysfs_destroy(void)
> >   {
> > -     if (IS_ERR_OR_NULL(accel_class))
> > -             return;
> > -     class_destroy(accel_class);
> > -     accel_class = NULL;
> > +     class_unregister(&accel_class);
> >   }
> >
> >   static int accel_name_info(struct seq_file *m, void *data)
> > @@ -116,7 +111,7 @@ void accel_debugfs_init(struct drm_minor *minor, int minor_id)
> >   void accel_set_device_instance_params(struct device *kdev, int index)
> >   {
> >       kdev->devt = MKDEV(ACCEL_MAJOR, index);
> > -     kdev->class = accel_class;
> > +     kdev->class = &accel_class;
> >       kdev->type = &accel_sysfs_device_minor;
> >   }
> >
>
>
diff mbox series

Patch

diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
index 4a9baf02439e..2dc187e1ee41 100644
--- a/drivers/accel/drm_accel.c
+++ b/drivers/accel/drm_accel.c
@@ -21,7 +21,6 @@  static DEFINE_SPINLOCK(accel_minor_lock);
 static struct idr accel_minors_idr;
 
 static struct dentry *accel_debugfs_root;
-static struct class *accel_class;
 
 static struct device_type accel_sysfs_device_minor = {
 	.name = "accel_minor"
@@ -32,23 +31,19 @@  static char *accel_devnode(const struct device *dev, umode_t *mode)
 	return kasprintf(GFP_KERNEL, "accel/%s", dev_name(dev));
 }
 
+static const struct class accel_class = {
+	.name = "accel",
+	.devnode = accel_devnode,
+};
+
 static int accel_sysfs_init(void)
 {
-	accel_class = class_create("accel");
-	if (IS_ERR(accel_class))
-		return PTR_ERR(accel_class);
-
-	accel_class->devnode = accel_devnode;
-
-	return 0;
+	return class_register(&accel_class);
 }
 
 static void accel_sysfs_destroy(void)
 {
-	if (IS_ERR_OR_NULL(accel_class))
-		return;
-	class_destroy(accel_class);
-	accel_class = NULL;
+	class_unregister(&accel_class);
 }
 
 static int accel_name_info(struct seq_file *m, void *data)
@@ -116,7 +111,7 @@  void accel_debugfs_init(struct drm_minor *minor, int minor_id)
 void accel_set_device_instance_params(struct device *kdev, int index)
 {
 	kdev->devt = MKDEV(ACCEL_MAJOR, index);
-	kdev->class = accel_class;
+	kdev->class = &accel_class;
 	kdev->type = &accel_sysfs_device_minor;
 }