linux-kernel - Re: [PATCH v2 1/3] fpga: bridge: make fpga_bridge

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Message-ID: <4d41f54f-806c-9071-de68-6db69c3024da@gmail.com>
Date:   Fri, 11 Aug 2023 11:33:07 +0400
From:   Ivan Orlov <ivan.orlov0322@...il.com>
To:     mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
        trix@...hat.com
Cc:     linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 1/3] fpga: bridge: make fpga_bridge_class a static
 const structure

On 8/11/23 11:30, Ivan Orlov wrote:
> Now that the driver core allows for struct class to be in read-only
> memory, move the fpga_bridge_class structure to be declared at build
> time placing it into read-only memory, instead of having to be
> dynamically allocated at boot time.
> 
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
> ---
>   drivers/fpga/fpga-bridge.c | 25 ++++++++++++-------------
>   1 file changed, 12 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
> index a6c25dee9cc1..fe93549d051d 100644
> --- a/drivers/fpga/fpga-bridge.c
> +++ b/drivers/fpga/fpga-bridge.c
> @@ -14,7 +14,7 @@
>   #include <linux/spinlock.h>
>   
>   static DEFINE_IDA(fpga_bridge_ida);
> -static struct class *fpga_bridge_class;
> +static const struct class fpga_bridge_class;
>   
>   /* Lock for adding/removing bridges to linked lists*/
>   static DEFINE_SPINLOCK(bridge_list_lock);
> @@ -99,7 +99,7 @@ struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
>   {
>   	struct device *dev;
>   
> -	dev = class_find_device_by_of_node(fpga_bridge_class, np);
> +	dev = class_find_device_by_of_node(&fpga_bridge_class, np);
>   	if (!dev)
>   		return ERR_PTR(-ENODEV);
>   
> @@ -126,7 +126,7 @@ struct fpga_bridge *fpga_bridge_get(struct device *dev,
>   {
>   	struct device *bridge_dev;
>   
> -	bridge_dev = class_find_device(fpga_bridge_class, NULL, dev,
> +	bridge_dev = class_find_device(&fpga_bridge_class, NULL, dev,
>   				       fpga_bridge_dev_match);
>   	if (!bridge_dev)
>   		return ERR_PTR(-ENODEV);
> @@ -359,7 +359,7 @@ fpga_bridge_register(struct device *parent, const char *name,
>   	bridge->priv = priv;
>   
>   	bridge->dev.groups = br_ops->groups;
> -	bridge->dev.class = fpga_bridge_class;
> +	bridge->dev.class = &fpga_bridge_class;
>   	bridge->dev.parent = parent;
>   	bridge->dev.of_node = parent->of_node;
>   	bridge->dev.id = id;
> @@ -415,21 +415,20 @@ static void fpga_bridge_dev_release(struct device *dev)
>   	kfree(bridge);
>   }
>   
> +static const struct class fpga_bridge_class = {
> +	.name = "fpga_bridge",
> +	.dev_groups = fpga_bridge_groups,
> +	.dev_release = fpga_bridge_dev_release,
> +};
> +
>   static int __init fpga_bridge_dev_init(void)
>   {
> -	fpga_bridge_class = class_create("fpga_bridge");
> -	if (IS_ERR(fpga_bridge_class))
> -		return PTR_ERR(fpga_bridge_class);
> -
> -	fpga_bridge_class->dev_groups = fpga_bridge_groups;
> -	fpga_bridge_class->dev_release = fpga_bridge_dev_release;
> -
> -	return 0;
> +	return class_register(&fpga_bridge_class);
>   }
>   
>   static void __exit fpga_bridge_dev_exit(void)
>   {
> -	class_destroy(fpga_bridge_class);
> +	class_unregister(&fpga_bridge_class);
>   	ida_destroy(&fpga_bridge_ida);
>   }
>   

And I forgot the changelog here.

V1 -> V2:
- Add forward declaration of fpga_bridge_class
- Move definition of fpga_bridge_class to more logical place