linux-kernel - Re: [PATCH 1/2] comedi: dmm32at: Fix coding style

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Message-ID: <564CAA56.2030301@mev.co.uk>
Date:	Wed, 18 Nov 2015 16:41:58 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	Ranjith Thangavel <ranjithece24@...il.com>,
	gregkh@...uxfoundation.org
Cc:	hsweeten@...ionengravers.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] comedi: dmm32at: Fix coding style - use BIT macro

On 16/11/15 17:18, Ranjith Thangavel wrote:
> BIT macro is used for defining BIT location instead of
> shifting operator, usleep_range is preferred over
> udelay - coding style issue

This patch doesn't use usleep_range(), so the description is inaccurate.

>
> Signed-off-by: Ranjith Thangavel <ranjithece24@...il.com>
> ---
>   drivers/staging/comedi/drivers/dmm32at.c |  100 +++++++++++++++---------------
>   1 file changed, 50 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/dmm32at.c b/drivers/staging/comedi/drivers/dmm32at.c
> index 958c0d4..d312fda 100644
> --- a/drivers/staging/comedi/drivers/dmm32at.c
> +++ b/drivers/staging/comedi/drivers/dmm32at.c
[snip]
> -#define DMM32AT_AI_CFG_SCINT_20US	(0 << 4)
> -#define DMM32AT_AI_CFG_SCINT_15US	(1 << 4)
> -#define DMM32AT_AI_CFG_SCINT_10US	(2 << 4)
> -#define DMM32AT_AI_CFG_SCINT_5US	(3 << 4)
> -#define DMM32AT_AI_CFG_RANGE		(1 << 3)  /* 0=5V  1=10V */
> -#define DMM32AT_AI_CFG_ADBU		(1 << 2)  /* 0=bipolar  1=unipolar */
> +#define DMM32AT_AI_CFG_SCINT_20US	0
> +#define DMM32AT_AI_CFG_SCINT_15US	BIT(4)
> +#define DMM32AT_AI_CFG_SCINT_10US	(BIT(5) & ~BIT(4))

The `(BIT(5) & ~BIT(4))` is a bit ugly.  You can just use `BIT(5)` to 
fit in with the style of your other changes.

(Personally though, I don't think BIT() is appropriate for shifted, 
multi-bit values.)

> +#define DMM32AT_AI_CFG_SCINT_5US	(BIT(5) | BIT(4))
> +#define DMM32AT_AI_CFG_RANGE		BIT(3)  /* 0=5V  1=10V */
> +#define DMM32AT_AI_CFG_ADBU		BIT(2)  /* 0=bipolar  1=unipolar */
[snip]

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-
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