linux-kernel - Re: [PATCH net-next] net/mlx4: Mark expected switch fall-through

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Date:   Wed, 23 Jan 2019 12:29:13 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net/mlx4: Mark expected switch fall-through



On 1/23/2019 10:05 AM, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
> where we are expecting to fall through.
> 
> This patch fixes the following warning:
> 
> drivers/net/ethernet/mellanox/mlx4/eq.c: In function ‘mlx4_eq_int’:
> drivers/net/ethernet/mellanox/mlx4/mlx4.h:219:5: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (mlx4_debug_level)      \
>       ^
> drivers/net/ethernet/mellanox/mlx4/eq.c:558:4: note: in expansion of macro ‘mlx4_dbg’
>      mlx4_dbg(dev, "%s: MLX4_EVENT_TYPE_SRQ_LIMIT. srq_no=0x%x, eq 0x%x\n",
>      ^~~~~~~~
> drivers/net/ethernet/mellanox/mlx4/eq.c:561:3: note: here
>     case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
>     ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> This patch is part of the ongoing efforts to enabling
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/eq.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
> index 4953c852c247..2f4201023836 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/eq.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
> @@ -558,6 +558,7 @@ static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq)
>   			mlx4_dbg(dev, "%s: MLX4_EVENT_TYPE_SRQ_LIMIT. srq_no=0x%x, eq 0x%x\n",
>   				 __func__, be32_to_cpu(eqe->event.srq.srqn),
>   				 eq->eqn);
> +			/* fall through */
>   		case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
>   			if (mlx4_is_master(dev)) {
>   				/* forward only to slave owning the SRQ */
> 


Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Thanks for your patch.