linux-kernel - Re: [PATCH v2 3/5] staging: iio: adc: Avoid precedence issues in macro

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Date:   Sun, 24 Mar 2019 12:37:23 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Cristian Sicilia <sicilia.cristian@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] staging: iio: adc: Avoid precedence issues in
 macro

On Sat, 23 Mar 2019 20:21:42 +0100
Cristian Sicilia <sicilia.cristian@...il.com> wrote:

> Enclosing parameter with parenthesis due to avoid
> possible precedence issue.
> 
> Signed-off-by: Cristian Sicilia <sicilia.cristian@...il.com>
Applied to the togreg branch of iio.git which will get first
pushed out as testing for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/adc/ad7280a.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
> index 55b5879..d81a5bd 100644
> --- a/drivers/staging/iio/adc/ad7280a.c
> +++ b/drivers/staging/iio/adc/ad7280a.c
> @@ -97,9 +97,10 @@
>  #define AD7280A_NUM_CH			(AD7280A_AUX_ADC_6 - \
>  					AD7280A_CELL_VOLTAGE_1 + 1)
>  
> -#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) ((d * AD7280A_CELLS_PER_DEV) + c)
> -#define AD7280A_CALC_TEMP_CHAN_NUM(d, c)    ((d * AD7280A_CELLS_PER_DEV) + \
> -					     c - AD7280A_CELLS_PER_DEV)
> +#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \
> +					     (c))
> +#define AD7280A_CALC_TEMP_CHAN_NUM(d, c)    (((d) * AD7280A_CELLS_PER_DEV) + \
> +					     (c) - AD7280A_CELLS_PER_DEV)
>  
>  #define AD7280A_DEVADDR_MASTER		0
>  #define AD7280A_DEVADDR_ALL		0x1F