linux-kernel - Re: staging: iio: Replace a bit shift by a use of BIT.

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Date:   Wed, 22 Mar 2017 12:41:14 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
Cc:     outreachy-kernel@...glegroups.com, devel@...verdev.osuosl.org,
        linux-fbdev@...r.kernel.org,
        Teddy Wang <teddy.wang@...iconmotion.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: Re: staging: iio: Replace a bit shift by a use of BIT.

On Wed, Mar 22, 2017 at 08:19:42AM +0530, Arushi Singhal wrote:
> This patch replaces bit shifting on 1 with the BIT(x) macro.
> This was done with coccinelle:
> @@
> constant c;
> @@
> 
> -1 << c
> +BIT(c)
> 
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
> ---
>  drivers/staging/iio/adc/ad7816.c |  2 +-
>  drivers/staging/iio/cdc/ad7150.c |  2 +-
>  drivers/staging/iio/cdc/ad7746.c | 22 +++++++++++-----------
>  3 files changed, 13 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
> index 17d280581e24..42f637ca0251 100644
> --- a/drivers/staging/iio/adc/ad7816.c
> +++ b/drivers/staging/iio/adc/ad7816.c
> @@ -222,7 +222,7 @@ static ssize_t ad7816_show_value(struct device *dev,
>  		value = (s8)((data >> AD7816_TEMP_FLOAT_OFFSET) - 103);
>  		data &= AD7816_TEMP_FLOAT_MASK;
>  		if (value < 0)
> -			data = (1 << AD7816_TEMP_FLOAT_OFFSET) - data;
> +			data = (BIT(AD7816_TEMP_FLOAT_OFFSET)) - data;

Remove the extra parentheses from all of these:

			data = BIT(AD7816_TEMP_FLOAT_OFFSET) - data;

regards,
dan carpenter