Re: [PATCH] net: nixge: Address compiler warnings when building for i386

From: Andrew Lunn
Date: Mon Sep 24 2018 - 20:00:44 EST


On Mon, Sep 24, 2018 at 02:27:12PM -0700, Moritz Fischer wrote:
> Address compiler warnings reported by kbuild autobuilders
> when building for i386 as a result of dma_addr_t size on
> different architectures.
>
> warning: cast to pointer from integer of different size
> [-Wint-to-pointer-cast]
>
> Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx>
> ---
> drivers/net/ethernet/ni/nixge.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c
> index 74cf52e3fb09..0611f2335b4a 100644
> --- a/drivers/net/ethernet/ni/nixge.c
> +++ b/drivers/net/ethernet/ni/nixge.c
> @@ -127,8 +127,8 @@ struct nixge_hw_dma_bd {
> #ifdef CONFIG_PHYS_ADDR_T_64BIT
> #define nixge_hw_dma_bd_set_addr(bd, field, addr) \
> do { \
> - (bd)->field##_lo = lower_32_bits(((u64)addr)); \
> - (bd)->field##_hi = upper_32_bits(((u64)addr)); \
> + (bd)->field##_lo = lower_32_bits((addr)); \
> + (bd)->field##_hi = upper_32_bits((addr)); \
> } while (0)

Hi Maritz

Maybe turn this into an function. It is small enough it will get
inlined. You then gain type checking. Make addr a void *.

> #else
> #define nixge_hw_dma_bd_set_addr(bd, field, addr) \
> @@ -251,7 +251,7 @@ static void nixge_hw_dma_bd_release(struct net_device *ndev)
> NIXGE_MAX_JUMBO_FRAME_SIZE,
> DMA_FROM_DEVICE);
>
> - skb = (struct sk_buff *)
> + skb = (struct sk_buff *)(uintptr_t)
> nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
> sw_id_offset);

How about making nixge_hw_dma_bd_get_addr return a void *. You can
assign that to anything without needing a cast.

Andrew