Re: strcut casts unsigned long

[ratheesh k <ratheesh.ksz@xxxxxxxxx>]

On Fri, Aug 13, 2010 at 7:47 AM, hong zhang <henryzhang62@xxxxxxxxx> wrote:
> 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)
> {
>        return (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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