linux-kernel - Re: [PATCH v2 03/16] platform/surface: aggregator: move to_ssam_device() to use container_of

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Message-ID: <cc8125e0-a52e-f804-8e57-c3a1372ee6fc@redhat.com>
Date:   Wed, 11 Jan 2023 12:54:54 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Maximilian Luz <luzmaximilian@...il.com>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2 03/16] platform/surface: aggregator: move
 to_ssam_device() to use container_of_const()

Hi,

On 1/11/23 12:30, Greg Kroah-Hartman wrote:
> The driver core is changing to pass some pointers as const, so move
> to_ssam_device() to use container_of_const() to handle this change.
> to_ssam_device() now properly keeps the const-ness of the pointer passed
> into it, while as before it could be lost.
> 
> Cc: Maximilian Luz <luzmaximilian@...il.com>
> Cc: platform-driver-x86@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  include/linux/surface_aggregator/device.h | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/include/linux/surface_aggregator/device.h b/include/linux/surface_aggregator/device.h
> index 46c45d1b6368..24151a0e2c96 100644
> --- a/include/linux/surface_aggregator/device.h
> +++ b/include/linux/surface_aggregator/device.h
> @@ -229,10 +229,7 @@ static inline bool is_ssam_device(struct device *d)
>   * Return: Returns a pointer to the &struct ssam_device wrapping the given
>   * device @d.
>   */
> -static inline struct ssam_device *to_ssam_device(struct device *d)
> -{
> -	return container_of(d, struct ssam_device, dev);
> -}
> +#define to_ssam_device(d)	container_of_const(d, struct ssam_device, dev)

There is a kernel-doc comment for this helper, I'm not sure if sphinx is going
to like changing this from a static inline to a #define ?

At a minimum I guess the generated docs are going to loose some type info
by switching to a define. Can we keep this as a static inline ?

Regards,

Hans




>  
>  /**
>   * to_ssam_device_driver() - Casts the given device driver to a SSAM client