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

siddhant gupta
2020-11-03T04:40:54Z

On Tue, 3 Nov 2020 at 01:10, Greg KH <gregkh@linuxfoundation.org> wrote:
>
> 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@gmail.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...)

Following Checkpatch, I thought it might be good to do as checkpatch said,
but the code looks better and more readable without the change. This
is my first patch and also a
lesson that i should not fix every checkpatch warnings. I'll pick
something better next time
Thanks for your comment
.