linux-kernel - Re: [Outreachy kernel] [PATCH] Staging: media: imx: Prefer using BIT macro

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Message-ID: <CAOw6vbLPfzZ5WzY0Qd9sXp40SGTZAxqVB7x+cTkNuHX79uazzw@mail.gmail.com>
Date:   Fri, 8 Sep 2017 11:29:32 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Srishti Sharma <srishtishar@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        slongerbeam@...il.com, Philipp Zabel <p.zabel@...gutronix.de>,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] Staging: media: imx: Prefer using BIT macro

On Fri, Sep 8, 2017 at 11:11 AM, Srishti Sharma <srishtishar@...il.com> wrote:
> Use BIT(x) instead of (1<<x).
>
> Signed-off-by: Srishti Sharma <srishtishar@...il.com>
> ---
>  drivers/staging/media/imx/imx-media.h | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
> index d409170..e5b8d29 100644
> --- a/drivers/staging/media/imx/imx-media.h
> +++ b/drivers/staging/media/imx/imx-media.h
> @@ -310,16 +310,16 @@ void imx_media_capture_device_set_format(struct imx_media_video_dev *vdev,
>  void imx_media_capture_device_error(struct imx_media_video_dev *vdev);
>
>  /* subdev group ids */
> -#define IMX_MEDIA_GRP_ID_SENSOR    (1 << 8)
> -#define IMX_MEDIA_GRP_ID_VIDMUX    (1 << 9)
> -#define IMX_MEDIA_GRP_ID_CSI2      (1 << 10)
> +#define IMX_MEDIA_GRP_ID_SENSOR    BIT(8)
> +#define IMX_MEDIA_GRP_ID_VIDMUX    BIT(9)
> +#define IMX_MEDIA_GRP_ID_CSI2      BIT(10)
>  #define IMX_MEDIA_GRP_ID_CSI_BIT   11
>  #define IMX_MEDIA_GRP_ID_CSI       (0x3 << IMX_MEDIA_GRP_ID_CSI_BIT)
> -#define IMX_MEDIA_GRP_ID_CSI0      (1 << IMX_MEDIA_GRP_ID_CSI_BIT)
> +#define IMX_MEDIA_GRP_ID_CSI0      BIT(IMX_MEDIA_GRP_ID_CSI_BIT)
>  #define IMX_MEDIA_GRP_ID_CSI1      (2 << IMX_MEDIA_GRP_ID_CSI_BIT)
> -#define IMX_MEDIA_GRP_ID_VDIC      (1 << 13)
> -#define IMX_MEDIA_GRP_ID_IC_PRP    (1 << 14)
> -#define IMX_MEDIA_GRP_ID_IC_PRPENC (1 << 15)
> -#define IMX_MEDIA_GRP_ID_IC_PRPVF  (1 << 16)
> +#define IMX_MEDIA_GRP_ID_VDIC      BIT(13)
> +#define IMX_MEDIA_GRP_ID_IC_PRP    BIT(14)
> +#define IMX_MEDIA_GRP_ID_IC_PRPENC BIT(15)
> +#define IMX_MEDIA_GRP_ID_IC_PRPVF  BIT(16)

Hi Srishti,
Thanks for your patch.

Perhaps this is just personal preference, but I find the previous
version more readable. Since IMX_MEDIA_GRP_ID_CSI and
IMX_MEDIA_GRP_ID_CSI1 are multi-bit fields, you can't fully eliminate
the bit shift operations, so you end up with a mix, which is kind of
ugly.

Sean

>
>  #endif
> --
> 2.7.4
>
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