netdev - Re: [PATCH net 1/2] net: ipv6: seg6_iptunnel: set tunnel headroom to zero

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Date:   Thu, 06 Feb 2020 13:54:18 +0100 (CET)
From:   David Miller <davem@...emloft.net>
To:     alex.aring@...il.com
Cc:     kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org,
        netdev@...r.kernel.org, andrea.mayer@...roma2.it,
        dav.lebrun@...il.com, mcr@...delman.ca, stefan@...enfreihafen.org
Subject: Re: [PATCH net 1/2] net: ipv6: seg6_iptunnel: set tunnel headroom
 to zero

From: Alexander Aring <alex.aring@...il.com>
Date: Tue,  4 Feb 2020 12:30:18 -0500

> diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
> index ab7f124ff5d7..5b6e88f16e2d 100644
> --- a/net/ipv6/seg6_iptunnel.c
> +++ b/net/ipv6/seg6_iptunnel.c
> @@ -449,8 +449,6 @@ static int seg6_build_state(struct nlattr *nla,
>  	if (tuninfo->mode != SEG6_IPTUN_MODE_L2ENCAP)
>  		newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT;
>  
> -	newts->headroom = seg6_lwt_headroom(tuninfo);
> -
>  	*ts = newts;
>  
>  	return 0;

Even if this change is correct, you are eliminating the one and only
user of seg6_lwt_headroom() so you would have to kill that in this
patch as well.