ipg.c doesn't compile with with CONFIG_HIGHMEM64G

I've tried to compile 2.6.23-rc8-mm2, but it fails on ipg.c with the
error : ERROR: "__udivdi3" [drivers/net/ipg.ko] undefined!

I've instigated a bit, and I've found this code in ipg.c :

static void ipg_nic_txfree(struct net_device *dev)
{
       struct ipg_nic_private *sp = netdev_priv(dev);
       void __iomem *ioaddr = sp->ioaddr;
       const unsigned int curr = ipg_r32(TFD_LIST_PTR_0) -
               (sp->txd_map / sizeof(struct ipg_tx)) - 1;
       unsigned int released, pending;

sp->txd_map is an u64
because :
	dma_addr_t txd_map;

And in asm-i386/types.h, I see :
#ifdef CONFIG_HIGHMEM64G
typedef u64 dma_addr_t;
#else
typedef u32 dma_addr_t;
#endif
I my config, I use CONFIG_HIGHMEM64G

sizeof(struct ipg_tx) is an u32
So the div failed on i386 because of u64 / u32.

[akpm@linux-foundation.org: cleanups]
Cc: Sorbica Shieh <sorbica@icplus.com.tw>
Cc: Jesse Huang <jesse@icplus.com.tw>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ipg.c b/drivers/net/ipg.c
index dfdc96fcadec..59898ce54dcf 100644
--- a/drivers/net/ipg.c
+++ b/drivers/net/ipg.c
@@ -25,6 +25,8 @@
 #include <linux/mii.h>
 #include <linux/mutex.h>
 
+#include <asm/div64.h>
+
 #define IPG_RX_RING_BYTES       (sizeof(struct ipg_rx) * IPG_RFDLIST_LENGTH)
 #define IPG_TX_RING_BYTES       (sizeof(struct ipg_tx) * IPG_TFDLIST_LENGTH)
 #define IPG_RESET_MASK \
@@ -836,10 +838,14 @@ static void ipg_nic_txfree(struct net_device *dev)
 {
         struct ipg_nic_private *sp = netdev_priv(dev);
         void __iomem *ioaddr = sp->ioaddr;
-        const unsigned int curr = ipg_r32(TFD_LIST_PTR_0) -
-                (sp->txd_map / sizeof(struct ipg_tx)) - 1;
+        unsigned int curr;
+        u64 txd_map;
         unsigned int released, pending;
 
+        txd_map = (u64)sp->txd_map;
+        curr = ipg_r32(TFD_LIST_PTR_0) -
+                do_div(txd_map, sizeof(struct ipg_tx)) - 1;
+
         IPG_DEBUG_MSG("_nic_txfree\n");
 
         pending = sp->tx_current - sp->tx_dirty;