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 <l...@intel.com>


sparse warnings: (new ones prefixed by >>)

>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> net/xfrm/espintcp.c:421:29: sparse: sparse: incorrect type in assignment 
>> (different address spaces) @@    expected void [noderef] <asn:4> 
>> *icsk_ulp_data @@    got struct evoid [noderef] <asn:4> *icsk_ulp_data @@
>> net/xfrm/espintcp.c:421:29: sparse:    expected void [noderef] <asn:4> 
>> *icsk_ulp_data
>> net/xfrm/espintcp.c:421:29: sparse:    got struct espintcp_ctx *[assigned] 
>> ctx
>> 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
>> 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
>> 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;

---
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