linux-kernel - Re: [PATCH] mlx4: style: replace zero-length array with flexible-array member.

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Date:   Wed, 30 Dec 2020 11:37:48 +0200
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     YANG LI <abaci-bugfix@...ux.alibaba.com>,
        "kuba@...nel.org" <kuba@...nel.org>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "kafai@...com" <kafai@...com>,
        "songliubraving@...com" <songliubraving@...com>,
        "yhs@...com" <yhs@...com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "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>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH] mlx4: style: replace zero-length array with
 flexible-array member.



On 12/30/2020 8:28 AM, YANG LI wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use "flexible array members"[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.9/process/
>      deprecated.html#zero-length-and-one-element-arrays
> 
> Signed-off-by: YANG LI <abaci-bugfix@...ux.alibaba.com>
> Reported-by: Abaci <abaci@...ux.alibaba.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index e8ed2319..4029a8b 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -314,7 +314,7 @@ struct mlx4_en_tx_ring {
>   
>   struct mlx4_en_rx_desc {
>   	/* actual number of entries depends on rx ring stride */
> -	struct mlx4_wqe_data_seg data[0];
> +	struct mlx4_wqe_data_seg data[];
>   };
>   
>   struct mlx4_en_rx_ring {
> 

Reviewed-by: Tariq Toukan <tariqt@...dia.com>

Thanks.