linux-kernel - Re: [PATCH v2] iio: freq: admv1014: Fix warning about dubious x & !y and improve readability

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Date:   Sat, 14 May 2022 16:11:36 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v2] iio: freq: admv1014: Fix warning about dubious x &
 !y and improve readability

On Wed, 11 May 2022 12:00:06 +0300
Antoniu Miclaus <antoniu.miclaus@...log.com> wrote:

> The warning comes from __BF_FIELD_CHECK()
> specifically
> 
> BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?		\
> 		 ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \
> 		 _pfx "value too large for the field"); \
> 
> The code was using !(enum value) which is not particularly easy to follow
> so replace that with explicit matching and use of ? 0 : 1; or ? 1 : 0;
> to improve readability.
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>

Thanks. 

Applied tot he fixes-togreg branch of iio.git.

Thanks,

Jonathan

> ---
> changes in v2:
>  - fix the logic for the input mode set bits
>  drivers/iio/frequency/admv1014.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/frequency/admv1014.c b/drivers/iio/frequency/admv1014.c
> index a7994f8e6b9b..1aac5665b5de 100644
> --- a/drivers/iio/frequency/admv1014.c
> +++ b/drivers/iio/frequency/admv1014.c
> @@ -700,8 +700,10 @@ static int admv1014_init(struct admv1014_state *st)
>  			 ADMV1014_DET_EN_MSK;
>  
>  	enable_reg = FIELD_PREP(ADMV1014_P1DB_COMPENSATION_MSK, st->p1db_comp ? 3 : 0) |
> -		     FIELD_PREP(ADMV1014_IF_AMP_PD_MSK, !(st->input_mode)) |
> -		     FIELD_PREP(ADMV1014_BB_AMP_PD_MSK, st->input_mode) |
> +		     FIELD_PREP(ADMV1014_IF_AMP_PD_MSK,
> +				(st->input_mode == ADMV1014_IF_MODE) ? 0 : 1) |
> +		     FIELD_PREP(ADMV1014_BB_AMP_PD_MSK,
> +				(st->input_mode == ADMV1014_IF_MODE) ? 1 : 0) |
>  		     FIELD_PREP(ADMV1014_DET_EN_MSK, st->det_en);
>  
>  	return __admv1014_spi_update_bits(st, ADMV1014_REG_ENABLE, enable_reg_msk, enable_reg);