netdev - Re: [PATCH] mlx5: avoid build warnings on 32-bit

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Date:	Tue, 13 Jan 2015 18:28:03 +0200
From:	Eli Cohen <eli@....mellanox.co.il>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	linux-rdma@...r.kernel.org
Subject: Re: [PATCH] mlx5: avoid build warnings on 32-bit

On Tue, Jan 13, 2015 at 05:08:06PM +0100, Arnd Bergmann wrote:

Hi Arnd,
wouldn't it work by casting to uintptr_t instead of unsigned long?

> The mlx5 driver passes a string pointer in through a 'u64' variable,
> which on 32-bit machines causes a build warning:
> 
> drivers/net/ethernet/mellanox/mlx5/core/debugfs.c: In function 'qp_read_field':
> drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:303:11: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> 
> The code is in fact safe, so we can shut up the warning by adding
> extra type casts.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
> index 10e1f1a18255..4878025e231c 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
> @@ -300,11 +300,11 @@ static u64 qp_read_field(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp,
>  		param = qp->pid;
>  		break;
>  	case QP_STATE:
> -		param = (u64)mlx5_qp_state_str(be32_to_cpu(ctx->flags) >> 28);
> +		param = (unsigned long)mlx5_qp_state_str(be32_to_cpu(ctx->flags) >> 28);
>  		*is_str = 1;
>  		break;
>  	case QP_XPORT:
> -		param = (u64)mlx5_qp_type_str((be32_to_cpu(ctx->flags) >> 16) & 0xff);
> +		param = (unsigned long)mlx5_qp_type_str((be32_to_cpu(ctx->flags) >> 16) & 0xff);
>  		*is_str = 1;
>  		break;
>  	case QP_MTU:
> @@ -464,7 +464,7 @@ static ssize_t dbg_read(struct file *filp, char __user *buf, size_t count,
>  
>  
>  	if (is_str)
> -		ret = snprintf(tbuf, sizeof(tbuf), "%s\n", (const char *)field);
> +		ret = snprintf(tbuf, sizeof(tbuf), "%s\n", (const char *)(unsigned long)field);
>  	else
>  		ret = snprintf(tbuf, sizeof(tbuf), "0x%llx\n", field);
>  
> 
> --
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