linux-kernel - Re: [PATCH 2/2] power: supply: validate size of power_supply

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Date:   Wed, 5 Jan 2022 07:49:59 +0100
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] power: supply: validate size of power_supply_attrs
 at compiletime

Hi Sebastian, Hans,

On 2022-01-05 07:42+0100, Thomas Weißschuh wrote:
> For each member of enum power_supply_property a matching entry in
> power_supply_attrs is needed.
> Add a basic test at compiletime to validate this in addition to the
> existing runtime testing.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  drivers/power/supply/power_supply_sysfs.c | 2 ++
>  include/linux/power_supply.h              | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
> index 491ffec7bf47..2565052a7a8c 100644
> --- a/drivers/power/supply/power_supply_sysfs.c
> +++ b/drivers/power/supply/power_supply_sysfs.c
> @@ -403,6 +403,8 @@ void power_supply_init_attrs(struct device_type *dev_type)
>  {
>  	int i;
>  
> +	BUILD_BUG_ON(ARRAY_SIZE(power_supply_attrs) != __POWER_SUPPLY_PROP_CNT);
> +
>  	dev_type->groups = power_supply_attr_groups;
>  
>  	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
> diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
> index 71f0379c2af8..60853f26e25f 100644
> --- a/include/linux/power_supply.h
> +++ b/include/linux/power_supply.h
> @@ -172,6 +172,8 @@ enum power_supply_property {
>  	POWER_SUPPLY_PROP_MODEL_NAME,
>  	POWER_SUPPLY_PROP_MANUFACTURER,
>  	POWER_SUPPLY_PROP_SERIAL_NUMBER,
> +
> +	__POWER_SUPPLY_PROP_CNT
>  };
>  
>  enum power_supply_type {
> -- 
> 2.34.1
> 

Please ignore this patch. It does not do what is tries to do. Sorry for the
noise.

Thomas