linux-kernel - Re: [PATCH] staging: mt7621-dma: Prefer Using BIT Macro instead of left shifting on 1.

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Message-ID: <20201102194055.GA2429929@kroah.com>
Date:   Mon, 2 Nov 2020 20:40:55 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "siddhant gupta(siddhant1223)" <siddhantgupta416@...il.com>
Cc:     matthias.bgg@...il.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        mamatashukla555@...il.com, linux-arm-kernel@...ts.infradead.org,
        himadrispandya@...il.com
Subject: Re: [PATCH] staging: mt7621-dma: Prefer Using BIT Macro instead of
 left shifting on 1.

On Tue, Nov 03, 2020 at 01:04:02AM +0530, siddhant gupta(siddhant1223) wrote:
> 
> Replace left shifting on 1 by a BIT macro to fix checkpatch warning.
> 
> Signed-off-by: Siddhant Gupta <siddhantgupta416@...il.com>
> 
> ---
>  drivers/staging/mt7621-dma/mtk-hsdma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/mt7621-dma/mtk-hsdma.c b/drivers/staging/mt7621-dma/mtk-hsdma.c
> index 354536783e1c..a9e1a1b14035 100644
> --- a/drivers/staging/mt7621-dma/mtk-hsdma.c
> +++ b/drivers/staging/mt7621-dma/mtk-hsdma.c
> @@ -72,7 +72,7 @@
>  #define HSDMA_GLO_TX_DMA		BIT(0)
>  
>  #define HSDMA_BT_SIZE_16BYTES		(0 << HSDMA_GLO_BT_SHIFT)
> -#define HSDMA_BT_SIZE_32BYTES		(1 << HSDMA_GLO_BT_SHIFT)
> +#define HSDMA_BT_SIZE_32BYTES		BIT(HSDMA_GLO_BT_SHIFT)
>  #define HSDMA_BT_SIZE_64BYTES		(2 << HSDMA_GLO_BT_SHIFT)
>  #define HSDMA_BT_SIZE_128BYTES		(3 << HSDMA_GLO_BT_SHIFT)

In looking at the code, does this change really make sense?

(hint, I don't think so...)