Re: [PATCH v3 6/6] iio: adc: ad7173: Reduce device info struct size

[Nuno Sá]

On Mon, 2024-05-27 at 20:02 +0300, Dumitru Ceclan via B4 Relay wrote:
> From: Dumitru Ceclan <dumitru.ceclan@xxxxxxxxxx>
> 
> Reduce the size used by the device info struct by packing the bool
>  fields within the same byte. This reduces the struct size from 52 bytes
>  to 44 bytes.
> 
> Signed-off-by: Dumitru Ceclan <dumitru.ceclan@xxxxxxxxxx>
> ---
>  drivers/iio/adc/ad7173.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
> index 328685ce25e0..e8357a21d513 100644
> --- a/drivers/iio/adc/ad7173.c
> +++ b/drivers/iio/adc/ad7173.c
> @@ -179,15 +179,15 @@ struct ad7173_device_info {
>  	unsigned int clock;
>  	unsigned int id;
>  	char *name;
> -	bool has_current_inputs;
> -	bool has_vcom_input;
> -	bool has_temp;
> +	bool has_current_inputs		:1;
> +	bool has_vcom_input		:1;
> +	bool has_temp			:1;
>  	/* ((AVDD1 − AVSS)/5) */
> -	bool has_common_input;
> -	bool has_input_buf;
> -	bool has_int_ref;
> -	bool has_ref2;
> -	bool higher_gpio_bits;
> +	bool has_common_input		:1;
> +	bool has_input_buf		:1;
> +	bool has_int_ref		:1;
> +	bool has_ref2			:1;
> +	bool higher_gpio_bits		:1;
>  	u8 num_gpios;
>  };
>  
> 

This is really a very micro optimization... I would drop it tbh but no strong
feelings about it.

- Nuno Sá