linux-kernel - Re: [PATCH] accel: make accel_class a static const structure

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Message-ID: <1caf16e9-f066-f889-278c-fe1c242930c3@habana.ai>
Date:   Mon, 3 Jul 2023 12:09:16 +0000
From:   Tomer Tayar <ttayar@...ana.ai>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     Oded Gabbay <ogabbay@...nel.org>,
        Ivan Orlov <ivan.orlov0322@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] accel: make accel_class a static const structure

On 20/06/2023 21:25, Greg Kroah-Hartman wrote:
> From: Ivan Orlov <ivan.orlov0322@...il.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@...nel.org>
> Cc: dri-devel@...ts.freedesktop.org
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Reviewed-by: Tomer Tayar <ttayar@...ana.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;
>   }
>