linux-kernel - Re: [Outreachy kernel] [PATCH v2] staging: iio: Replace a bit shift by a use of BIT.

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Message-ID: <alpine.DEB.2.20.1703222243450.2132@hadrien>
Date:   Wed, 22 Mar 2017 22:44:28 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
cc:     lars@...afoo.de, Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        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, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH v2] staging: iio: Replace a bit shift
 by a use of BIT.



On Wed, 22 Mar 2017, 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>
> ---
> changes in v2
>  -remove/correct the wrong code.
>
>  drivers/staging/iio/cdc/ad7150.c |  2 +-
>  drivers/staging/iio/cdc/ad7746.c | 16 ++++++++--------
>  2 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
> index ca72af3e9d4b..a6f249e9c1e1 100644
> --- a/drivers/staging/iio/cdc/ad7150.c
> +++ b/drivers/staging/iio/cdc/ad7150.c
> @@ -232,7 +232,7 @@ static int ad7150_write_event_config(struct iio_dev *indio_dev,
>  	if (ret < 0)
>  		goto error_ret;
>
> -	cfg = ret & ~((0x03 << 5) | (0x1 << 7));
> +	cfg = ret & ~((0x03 << 5) | BIT(7));
>
>  	switch (type) {
>  	case IIO_EV_TYPE_MAG_ADAPTIVE:
> diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
> index 81f8b9ee1120..453d3978879d 100644
> --- a/drivers/staging/iio/cdc/ad7746.c
> +++ b/drivers/staging/iio/cdc/ad7746.c
> @@ -45,10 +45,10 @@
>  #define AD7746_STATUS_RDYCAP		BIT(0)
>
>  /* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
> -#define AD7746_CAPSETUP_CAPEN		(1 << 7)
> -#define AD7746_CAPSETUP_CIN2		(1 << 6) /* AD7746 only */
> -#define AD7746_CAPSETUP_CAPDIFF		(1 << 5)
> -#define AD7746_CAPSETUP_CACHOP		(1 << 0)
> +#define AD7746_CAPSETUP_CAPEN		(BIT(7))
> +#define AD7746_CAPSETUP_CIN2		(BIT(6)) /* AD7746 only */
> +#define AD7746_CAPSETUP_CAPDIFF		(BIT(5))
> +#define AD7746_CAPSETUP_CACHOP		(BIT(0))

The parentheses here are not needed.

>
>  /* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
>  #define AD7746_VTSETUP_VTEN		(1 << 7)
> @@ -56,9 +56,9 @@
>  #define AD7746_VTSETUP_VTMD_EXT_TEMP	(1 << 5)
>  #define AD7746_VTSETUP_VTMD_VDD_MON	(2 << 5)
>  #define AD7746_VTSETUP_VTMD_EXT_VIN	(3 << 5)
> -#define AD7746_VTSETUP_EXTREF		(1 << 4)
> -#define AD7746_VTSETUP_VTSHORT		(1 << 1)
> -#define AD7746_VTSETUP_VTCHOP		(1 << 0)
> +#define AD7746_VTSETUP_EXTREF		(BIT(4))
> +#define AD7746_VTSETUP_VTSHORT		(BIT(1))
> +#define AD7746_VTSETUP_VTCHOP		(BIT(0))
>

Same here.

>  /* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
>  #define AD7746_EXCSETUP_CLKCTRL		BIT(7)
> @@ -82,7 +82,7 @@
>  #define AD7746_CONF_MODE_GAIN_CAL	(6 << 0)
>
>  /* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */
> -#define AD7746_CAPDAC_DACEN		(1 << 7)
> +#define AD7746_CAPDAC_DACEN		(BIT(7))

Here too.

julia

>  #define AD7746_CAPDAC_DACP(x)		((x) & 0x7F)
>
>  /*
> --
> 2.11.0
>
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