[PATCH net-next v3] net: Fix Hisilicon Network Subsystem Support Compilation

[David Miller]

From: huangdaode <huangdaode at hisilicon.com>
Date: Fri, 25 Sep 2015 16:29:50 +0800

> @@ -191,9 +191,12 @@ static void hns_rcb_ring_init(struct ring_pair_cb *ring_pair, int ring_type)
>  	if (ring_type == RX_RING) {
>  		dsaf_write_dev(q, RCB_RING_RX_RING_BASEADDR_L_REG,
>  			       (u32)dma);
> +#ifdef CONFIG_64BIT
>  		dsaf_write_dev(q, RCB_RING_RX_RING_BASEADDR_H_REG,
>  			       (u32)(dma >> 32));
> -
> +#else
> +		dsaf_write_dev(q, RCB_RING_RX_RING_BASEADDR_H_REG, 0);
> +#endif
>  		dsaf_write_dev(q, RCB_RING_RX_RING_BD_LEN_REG,
>  			       bd_size_type);
>  		dsaf_write_dev(q, RCB_RING_RX_RING_BD_NUM_REG,

CONFIG_64BIT doesn't tell you if _DMA_ addresses are 64-bit or not.

Furthermore there is a portable way to shift a 32-bit value down
32-bits whilst avoiding warnings.

	(x >> 31) >> 1

So you should definitely use that instead of the CONFIG_64BIT test.