netdev - Re: [IPV4]: Add an 'rtable' field in struct sk_buff to alias 'dst' field and avoid casts

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Date:	Mon, 03 Mar 2008 23:46:49 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	netdev@...r.kernel.org
Subject: Re: [IPV4]: Add an 'rtable' field in struct sk_buff to alias 'dst'
 field and avoid casts

From: Eric Dumazet <dada1@...mosbay.com>
Date: Tue, 04 Mar 2008 08:36:43 +0100

> Yes, I had this idea, but felt that it was better in this case to have a 
> dst_hold() that refers to the above affectation.
> 
> skb->dst = &__fake_rtable.u.dst;
> dst_hold(skb->dst);
> 
> instead of
> 
> skb->rtable = &__fake_rtable;
> dst_hold(skb->dst);
> 
> Do you prefer the later ?

Wouldn't it be pleasant if you could pass
&__fake_rtable to dst_hold() directly?

Can't we do that by making it's arg an anonymous union like the thing
you're doing here?
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