linux-kernel - Re: [PATCH v3] drivers: staging: media: omap4iss: Use BIT macro instead of left shifting

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Message-ID: <Ye3fAuBFkuzesBTM@pendragon.ideasonboard.com>
Date:   Mon, 24 Jan 2022 01:04:34 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Moses Christopher Bollavarapu <mosescb.dev@...il.com>
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        mchehab@...nel.org, Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v3] drivers: staging: media: omap4iss: Use BIT macro
 instead of left shifting

Hi Moses,

Thank you for the patch.

On Fri, Jan 21, 2022 at 11:51:11AM +0100, Moses Christopher Bollavarapu wrote:
> There is a BIT(nr) macro available in Linux Kernel,
> which does the same thing.
> 
> Example:  1 << 7  is same as BIT(7)
> 
> Signed-off-by: Moses Christopher Bollavarapu <mosescb.dev@...il.com>
> Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  V2 -> V3: Add Dan's Reviewed-by tag to commit message
>  V1 -> V2: Use BIT(0) instead of 1
> 
>  drivers/staging/media/omap4iss/iss_video.h | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/media/omap4iss/iss_video.h b/drivers/staging/media/omap4iss/iss_video.h
> index 526281bf0051..1724ed03ce9d 100644
> --- a/drivers/staging/media/omap4iss/iss_video.h
> +++ b/drivers/staging/media/omap4iss/iss_video.h
> @@ -53,19 +53,19 @@ enum iss_pipeline_stream_state {
>  
>  enum iss_pipeline_state {
>  	/* The stream has been started on the input video node. */
> -	ISS_PIPELINE_STREAM_INPUT = 1,
> +	ISS_PIPELINE_STREAM_INPUT = BIT(0),
>  	/* The stream has been started on the output video node. */
> -	ISS_PIPELINE_STREAM_OUTPUT = (1 << 1),
> +	ISS_PIPELINE_STREAM_OUTPUT = BIT(1),
>  	/* At least one buffer is queued on the input video node. */
> -	ISS_PIPELINE_QUEUE_INPUT = (1 << 2),
> +	ISS_PIPELINE_QUEUE_INPUT = BIT(2),
>  	/* At least one buffer is queued on the output video node. */
> -	ISS_PIPELINE_QUEUE_OUTPUT = (1 << 3),
> +	ISS_PIPELINE_QUEUE_OUTPUT = BIT(3),
>  	/* The input entity is idle, ready to be started. */
> -	ISS_PIPELINE_IDLE_INPUT = (1 << 4),
> +	ISS_PIPELINE_IDLE_INPUT = BIT(4),
>  	/* The output entity is idle, ready to be started. */
> -	ISS_PIPELINE_IDLE_OUTPUT = (1 << 5),
> +	ISS_PIPELINE_IDLE_OUTPUT = BIT(5),
>  	/* The pipeline is currently streaming. */
> -	ISS_PIPELINE_STREAM = (1 << 6),
> +	ISS_PIPELINE_STREAM = BIT(6),
>  };
>  
>  /*
> @@ -119,9 +119,9 @@ struct iss_buffer {
>  
>  enum iss_video_dmaqueue_flags {
>  	/* Set if DMA queue becomes empty when ISS_PIPELINE_STREAM_CONTINUOUS */
> -	ISS_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0),
> +	ISS_VIDEO_DMAQUEUE_UNDERRUN = BIT(0),
>  	/* Set when queuing buffer to an empty DMA queue */
> -	ISS_VIDEO_DMAQUEUE_QUEUED = (1 << 1),
> +	ISS_VIDEO_DMAQUEUE_QUEUED = BIT(1),
>  };
>  
>  #define iss_video_dmaqueue_flags_clr(video)	\

-- 
Regards,

Laurent Pinchart