linux-kernel - [PATCH] net: nixge: fix warnings on 32-bit platforms

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Date:   Wed, 26 Sep 2018 14:47:24 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "David S. Miller" <davem@...emloft.net>,
        Moritz Fischer <mdf@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: nixge: fix warnings on 32-bit platforms

Making it work on 64-bit caused 32-bit builds to regress:

drivers/net/ethernet/ni/nixge.c: In function 'nixge_hw_dma_bd_release':
drivers/net/ethernet/ni/nixge.c:254:9: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   skb = (struct sk_buff *)
         ^
In file included from include/linux/skbuff.h:17,
                 from include/linux/if_ether.h:23,
                 from include/linux/etherdevice.h:25,
                 from drivers/net/ethernet/ni/nixge.c:7:
drivers/net/ethernet/ni/nixge.c: In function 'nixge_hw_dma_bd_init':
drivers/net/ethernet/ni/nixge.c:130:37: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   (bd)->field##_lo = lower_32_bits(((u64)addr)); \
                                     ^
include/linux/kernel.h:234:33: note: in definition of macro 'lower_32_bits'
 #define lower_32_bits(n) ((u32)(n))
                                 ^

Casting to a uintptr_t avoids all these warnings.

Fixes: 7e8d5755be0e ("net: nixge: Add support for 64-bit platforms")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/ni/nixge.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c
index 74cf52e3fb09..2e132f6a7c36 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(((uintptr_t)addr)); \
+		(bd)->field##_hi = upper_32_bits(((uintptr_t)addr)); \
 	} while (0)
 #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);
 		dev_kfree_skb(skb);
@@ -601,8 +601,8 @@ static int nixge_recv(struct net_device *ndev, int budget)
 		tail_p = priv->rx_bd_p + sizeof(*priv->rx_bd_v) *
 			 priv->rx_bd_ci;
 
-		skb = (struct sk_buff *)nixge_hw_dma_bd_get_addr(cur_p,
-								 sw_id_offset);
+		skb = (struct sk_buff *)(uintptr_t)
+			nixge_hw_dma_bd_get_addr(cur_p, sw_id_offset);
 
 		length = cur_p->status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
 		if (length > NIXGE_MAX_JUMBO_FRAME_SIZE)
-- 
2.18.0