netdev - Re: [ipsec-next:testing 7/8] include/net/espintcp.h:36:20: sparse: sparse: incorrect type in return expression (different address spaces)

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Date:   Tue, 8 Oct 2019 07:55:09 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     kbuild test robot <lkp@...el.com>
CC:     Sabrina Dubroca <sd@...asysnail.net>, <kbuild-all@...org>,
        <netdev@...r.kernel.org>, Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [ipsec-next:testing 7/8] include/net/espintcp.h:36:20: sparse:
 sparse: incorrect type in return expression (different address spaces)

On Sun, Oct 06, 2019 at 10:46:40AM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next.git testing
> head:   5374d99ba41893b4bb1ddbe35a88b1f08e860903
> commit: 735de2631f8680ac714df1ecc8e052785e9f9f8e [7/8] xfrm: add espintcp (RFC 8229)
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.1-rc1-42-g38eda53-dirty
>         git checkout 735de2631f8680ac714df1ecc8e052785e9f9f8e
>         make ARCH=x86_64 allmodconfig
>         make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> 
> >> include/net/espintcp.h:36:20: sparse:    expected struct espintcp_ctx *
> >> include/net/espintcp.h:36:20: sparse:    got void [noderef] <asn:4> *icsk_ulp_data
> >> include/net/espintcp.h:36:20: sparse: sparse: incorrect type in return expression (different address spaces) @@    expected struct espintcp_ctx * @@    got voistruct espintcp_ctx * @@
> >> include/net/espintcp.h:36:20: sparse:    expected struct espintcp_ctx *
> >> include/net/espintcp.h:36:20: sparse:    got void [noderef] <asn:4> *icsk_ulp_data
> 
> vim +36 include/net/espintcp.h
> 
>     31	
>     32	static inline struct espintcp_ctx *espintcp_getctx(const struct sock *sk)
>     33	{
>     34		struct inet_connection_sock *icsk = inet_csk(sk);
>     35	
>   > 36		return icsk->icsk_ulp_data;

Sabrina, can you please fix this and resend the patchset?

Also, icsk_ulp_data has a __rcu annotation, so maybe better
using rcu primitives to access the pointer?

Another thing, where is espintcp_ctx that is assigned to
icsk_ulp_data freed?