[NET]: Make illegal_highdma more anal

[Herbert Xu <herbert@gondor.apana.org.au>]

Hi:

This patch should prevent mistakes like the one I made earlier.

[NET]: Make illegal_highdma more anal

Rather than having illegal_highdma as a macro when HIGHMEM is off, we
can turn it into an inline function that returns zero.  This will catch
callers that give it bad arguments.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Thanks,
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diff --git a/net/core/dev.c b/net/core/dev.c
index 9c68ab8..134d9d1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1234,7 +1234,6 @@ void netdev_rx_csum_fault(struct net_dev
 EXPORT_SYMBOL(netdev_rx_csum_fault);
 #endif
 
-#ifdef CONFIG_HIGHMEM
 /* Actually, we should eliminate this check as soon as we know, that:
  * 1. IOMMU is present and allows to map all the memory.
  * 2. No high memory really exists on this machine.
@@ -1242,6 +1241,7 @@ #ifdef CONFIG_HIGHMEM
 
 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
 {
+#ifdef CONFIG_HIGHMEM
 	int i;
 
 	if (dev->features & NETIF_F_HIGHDMA)
@@ -1251,11 +1251,9 @@ static inline int illegal_highdma(struct
 		if (PageHighMem(skb_shinfo(skb)->frags[i].page))
 			return 1;
 
+#endif
 	return 0;
 }
-#else
-#define illegal_highdma(dev, skb)	(0)
-#endif
 
 struct dev_gso_cb {
 	void (*destructor)(struct sk_buff *skb);