From mboxrd@z Thu Jan  1 00:00:00 1970
From: ratheesh k <ratheesh.ksz@gmail.com>
Subject: Re: strcut casts unsigned long
Date: Fri, 13 Aug 2010 12:14:15 +0530
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To: hong zhang <henryzhang62@yahoo.com>
Cc: linux-c-programming@vger.kernel.org

On Fri, Aug 13, 2010 at 7:47 AM, hong zhang <henryzhang62@yahoo.com> wr=
ote:
> List,
>
> I have C question on skbuff.h.
> skb->_skb_dst is defined as unsigned long and dst_entry is struct.
>
> Why strct dst_entry casts unsigned long skb->_skb_dst?
>
> See below
>
> static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
> {
> =A0 =A0 =A0 =A0return (struct dst_entry *)skb->_skb_dst;
> }
>
> Appreciate any answer!
>
> --henry

skb->_skb_dst can be a pointer to both destination cache or  routing
table . We could type cast to any of those .

-Ratheesh











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