Re: [PATCH ipsec-next 02/10] tunnel4: add cb_handler to struct xfrm_tunnel

[Xin Long]

On Thu, Jun 18, 2020 at 12:19 AM Jakub Kicinski <k...@kernel.org> wrote:
>
> On Wed, 17 Jun 2020 01:36:27 +0800 Xin Long wrote:
> > This patch is to register a callback function tunnel4_rcv_cb with
> > is_ipip set in a xfrm_input_afinfo object for tunnel4 and tunnel64.
> >
> > It will be called by xfrm_rcv_cb() from xfrm_input() when family
> > is AF_INET and proto is IPPROTO_IPIP or IPPROTO_IPV6.
> >
> > Signed-off-by: Xin Long <lucien....@gmail.com>
>
> Please make sure W=1 C=1 builds don't add new warnings:
>
> net/ipv4/tunnel4.c:118:14: warning: incorrect type in assignment (different 
> address spaces)
> net/ipv4/tunnel4.c:118:14:    expected struct xfrm_tunnel *head
> net/ipv4/tunnel4.c:118:14:    got struct xfrm_tunnel [noderef] <asn:4> *
> net/ipv4/tunnel4.c:120:9: error: incompatible types in comparison expression 
> (different address spaces):
> net/ipv4/tunnel4.c:120:9:    struct xfrm_tunnel [noderef] <asn:4> *
> net/ipv4/tunnel4.c:120:9:    struct xfrm_tunnel *
I will change to on v2:
 static int tunnel4_rcv_cb(struct sk_buff *skb, u8 proto, int err)
 {
-       struct xfrm_tunnel *head, *handler;
+       struct xfrm_tunnel __rcu *head;
+       struct xfrm_tunnel *handler;
        int ret;

Thanks.