linux-kernel - Re: [PATCH] platform/surface: aggregator: make ssam_bus

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Date: Thu, 21 Dec 2023 14:03:03 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, Maximilian Luz <luzmaximilian@...il.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] platform/surface: aggregator: make ssam_bus_type constant
 and static

Hi Greg,

On 12/19/23 18:18, Greg Kroah-Hartman wrote:
> Now that the driver core can properly handle constant struct bus_type,
> move the ssam_bus_type variable to be a constant structure as well,
> placing it into read-only memory which can not be modified at runtime.
> 
> It's also never used outside of
> drivers/platform/surface/aggregator/bus.c so make it static and don't
> export it as no one is using it.
> 
> Cc: Maximilian Luz <luzmaximilian@...il.com>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: "Ilpo Järvinen" <ilpo.jarvinen@...ux.intel.com>
> Cc: platform-driver-x86@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Greg, do you plan to merge this yourself (fine with me)
or do you want me to merge this through pdx86 ?

Regards,

Hans





> ---
>  drivers/platform/surface/aggregator/bus.c | 5 +++--
>  include/linux/surface_aggregator/device.h | 1 -
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/surface/aggregator/bus.c b/drivers/platform/surface/aggregator/bus.c
> index 42ccd7f1c9b9..118caa651bec 100644
> --- a/drivers/platform/surface/aggregator/bus.c
> +++ b/drivers/platform/surface/aggregator/bus.c
> @@ -35,6 +35,8 @@ static struct attribute *ssam_device_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(ssam_device);
>  
> +static const struct bus_type ssam_bus_type;
> +
>  static int ssam_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
>  {
>  	const struct ssam_device *sdev = to_ssam_device(dev);
> @@ -329,13 +331,12 @@ static void ssam_bus_remove(struct device *dev)
>  		sdrv->remove(to_ssam_device(dev));
>  }
>  
> -struct bus_type ssam_bus_type = {
> +static const struct bus_type ssam_bus_type = {
>  	.name   = "surface_aggregator",
>  	.match  = ssam_bus_match,
>  	.probe  = ssam_bus_probe,
>  	.remove = ssam_bus_remove,
>  };
> -EXPORT_SYMBOL_GPL(ssam_bus_type);
>  
>  /**
>   * __ssam_device_driver_register() - Register a SSAM client device driver.
> diff --git a/include/linux/surface_aggregator/device.h b/include/linux/surface_aggregator/device.h
> index 42b249b4c24b..8cd8c38cf3f3 100644
> --- a/include/linux/surface_aggregator/device.h
> +++ b/include/linux/surface_aggregator/device.h
> @@ -193,7 +193,6 @@ struct ssam_device_driver {
>  
>  #ifdef CONFIG_SURFACE_AGGREGATOR_BUS
>  
> -extern struct bus_type ssam_bus_type;
>  extern const struct device_type ssam_device_type;
>  
>  /**