linux-kernel - Re: [PATCH] i40iw: Use fallthrough pseudo-keyword

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Date:   Sun, 9 May 2021 13:50:04 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Wei Ming Chen <jj251510319013@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH] i40iw: Use fallthrough pseudo-keyword

On Sun, May 09, 2021 at 04:31:35PM +0800, Wei Ming Chen wrote:
> Add pseudo-keyword macro fallthrough[1]
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
> 
> Signed-off-by: Wei Ming Chen <jj251510319013@...il.com>
> ---
>  drivers/infiniband/hw/i40iw/i40iw_ctrl.c | 1 +
>  drivers/infiniband/hw/i40iw/i40iw_uk.c   | 1 +
>  2 files changed, 2 insertions(+)

What exactly are you fixing?
"case" without any code doesn't need "fallthrough".

Thanks

> 
> diff --git a/drivers/infiniband/hw/i40iw/i40iw_ctrl.c b/drivers/infiniband/hw/i40iw/i40iw_ctrl.c
> index eaea5d545eb8..c6081283217c 100644
> --- a/drivers/infiniband/hw/i40iw/i40iw_ctrl.c
> +++ b/drivers/infiniband/hw/i40iw/i40iw_ctrl.c
> @@ -2454,6 +2454,7 @@ static enum i40iw_status_code i40iw_sc_qp_init(struct i40iw_sc_qp *qp,
>  			return ret_code;
>  		break;
>  	case 5: /* fallthrough until next ABI version */
> +		fallthrough;
>  	default:
>  		if (qp->qp_uk.max_rq_frag_cnt > I40IW_MAX_WQ_FRAGMENT_COUNT)
>  			return I40IW_ERR_INVALID_FRAG_COUNT;
> diff --git a/drivers/infiniband/hw/i40iw/i40iw_uk.c b/drivers/infiniband/hw/i40iw/i40iw_uk.c
> index f521be16bf31..e1c318c291c0 100644
> --- a/drivers/infiniband/hw/i40iw/i40iw_uk.c
> +++ b/drivers/infiniband/hw/i40iw/i40iw_uk.c
> @@ -1004,6 +1004,7 @@ enum i40iw_status_code i40iw_qp_uk_init(struct i40iw_qp_uk *qp,
>  			i40iw_get_wqe_shift(info->max_rq_frag_cnt, 0, &rqshift);
>  			break;
>  		case 5: /* fallthrough until next ABI version */
> +			fallthrough;
>  		default:
>  			rqshift = I40IW_MAX_RQ_WQE_SHIFT;
>  			break;
> -- 
> 2.25.1
>