linux-kernel - Re: [PATCH] sfc: Use swap() instead of open coding it

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Date:   Thu, 6 Jan 2022 09:02:21 +0000
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     ecree.xilinx@...il.com, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
        john.fastabend@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH] sfc: Use swap() instead of open coding it

On Wed, Jan 05, 2022 at 11:22:37PM +0800, Jiapeng Chong wrote:
> Clean the following coccicheck warning:
> 
> ./drivers/net/ethernet/sfc/efx_channels.c:870:36-37: WARNING opportunity
> for swap().
> 
> ./drivers/net/ethernet/sfc/efx_channels.c:824:36-37: WARNING opportunity
> for swap().
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>

Acked-by: Martin Habets <habetsm.xilinx@...il.com>

> ---
>  drivers/net/ethernet/sfc/efx_channels.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/efx_channels.c b/drivers/net/ethernet/sfc/efx_channels.c
> index b015d1f2e204..ead550ae2709 100644
> --- a/drivers/net/ethernet/sfc/efx_channels.c
> +++ b/drivers/net/ethernet/sfc/efx_channels.c
> @@ -819,11 +819,8 @@ int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
>  	old_txq_entries = efx->txq_entries;
>  	efx->rxq_entries = rxq_entries;
>  	efx->txq_entries = txq_entries;
> -	for (i = 0; i < efx->n_channels; i++) {
> -		channel = efx->channel[i];
> -		efx->channel[i] = other_channel[i];
> -		other_channel[i] = channel;
> -	}
> +	for (i = 0; i < efx->n_channels; i++)
> +		swap(efx->channel[i], other_channel[i]);
>  
>  	/* Restart buffer table allocation */
>  	efx->next_buffer_table = next_buffer_table;
> @@ -865,11 +862,8 @@ int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
>  	/* Swap back */
>  	efx->rxq_entries = old_rxq_entries;
>  	efx->txq_entries = old_txq_entries;
> -	for (i = 0; i < efx->n_channels; i++) {
> -		channel = efx->channel[i];
> -		efx->channel[i] = other_channel[i];
> -		other_channel[i] = channel;
> -	}
> +	for (i = 0; i < efx->n_channels; i++)
> +		swap(efx->channel[i], other_channel[i]);
>  	goto out;
>  }
>  
> -- 
> 2.20.1.7.g153144c