linux-kernel - Re: [PATCH] remoteproc: make rproc

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Date: Mon, 11 Mar 2024 09:41:12 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: "Ricardo B. Marliere" <ricardo@...liere.net>
Cc: Bjorn Andersson <andersson@...nel.org>,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] remoteproc: make rproc_class constant

Hi Ricardo,

On Tue, Mar 05, 2024 at 04:40:23PM -0300, Ricardo B. Marliere wrote:
> 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 rproc_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/remoteproc/remoteproc_internal.h | 2 +-
>  drivers/remoteproc/remoteproc_sysfs.c    | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index f62a82d71dfa..0cd09e67ac14 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -72,7 +72,7 @@ void rproc_init_debugfs(void);
>  void rproc_exit_debugfs(void);
>  
>  /* from remoteproc_sysfs.c */
> -extern struct class rproc_class;
> +extern const struct class rproc_class;
>  int rproc_init_sysfs(void);
>  void rproc_exit_sysfs(void);
>  
> diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
> index 8c7ea8922638..138e752c5e4e 100644
> --- a/drivers/remoteproc/remoteproc_sysfs.c
> +++ b/drivers/remoteproc/remoteproc_sysfs.c
> @@ -254,7 +254,7 @@ static const struct attribute_group *rproc_devgroups[] = {
>  	NULL
>  };
>  
> -struct class rproc_class = {
> +const struct class rproc_class = {
>  	.name		= "remoteproc",
>  	.dev_groups	= rproc_devgroups,
>  };
>

I am in agreement with both patches and will add them to 6.9-rc1 when it comes
out.

Thanks,
Mathieu

> ---
> base-commit: 8b46dc5cfa5ffea279aed0fc05dc4b1c39a51517
> change-id: 20240305-class_cleanup-remoteproc2-f1212934f990
> 
> Best regards,
> -- 
> Ricardo B. Marliere <ricardo@...liere.net>
>