err1.c

net/ipv4/rpitcp_ipv4.c:2455:11: error: ‘struct netns_ipv4’ has no member named ‘sysctl_rpitcp_retries2’
  net->ipv4.sysctl_rpitcp_retries2 = rpitcp_RETR2;
           ^
net/ipv4/rpitcp_ipv4.c:2455:37: error: ‘rpitcp_RETR2’ undeclared (first use in this function)
  net->ipv4.sysctl_rpitcp_retries2 = rpitcp_RETR2;
                                     ^
net/ipv4/rpitcp_ipv4.c:2456:11: error: ‘struct netns_ipv4’ has no member named ‘sysctl_rpitcp_orphan_retries’
  net->ipv4.sysctl_rpitcp_orphan_retries = 0;
           ^
net/ipv4/rpitcp_ipv4.c:2457:11: error: ‘struct netns_ipv4’ has no member named ‘sysctl_rpitcp_fin_timeout’
  net->ipv4.sysctl_rpitcp_fin_timeout = rpitcp_FIN_TIMEOUT;
           ^
net/ipv4/rpitcp_ipv4.c:2457:40: error: ‘rpitcp_FIN_TIMEOUT’ undeclared (first use in this function)
  net->ipv4.sysctl_rpitcp_fin_timeout = rpitcp_FIN_TIMEOUT;
                                        ^
net/ipv4/rpitcp_ipv4.c:2458:11: error: ‘struct netns_ipv4’ has no member named ‘sysctl_rpitcp_notsent_lowat’
  net->ipv4.sysctl_rpitcp_notsent_lowat = UINT_MAX;
           ^
net/ipv4/rpitcp_ipv4.c: In function ‘rpitcp_sk_exit_batch’:
net/ipv4/rpitcp_ipv4.c:2469:37: error: ‘rpitcp_death_row’ undeclared (first use in this function)
  inet_twsk_purge(&rpitcp_hashinfo, &rpitcp_death_row, AF_INET);
                                     ^
net/ipv4/rpitcp_ipv4.c: In function ‘rpitcp_v4_init’:
net/ipv4/rpitcp_ipv4.c:2481:30: error: ‘rpirpitcp_sk_ops’ undeclared (first use in this function)
  if (register_pernet_subsys(&rpirpitcp_sk_ops))
                              ^
net/ipv4/rpitcp_ipv4.c: At top level:
net/ipv4/rpitcp_ipv4.c:2472:48: warning: ‘rpitcp_sk_ops’ defined but not used [-Wunused-variable]
 static struct pernet_operations __net_initdata rpitcp_sk_ops = {

err2.c

  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/bounds.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  CHK     kernel/config_data.h
  LD      vmlinux.o
  MODPOST vmlinux.o
  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  LD      init/built-in.o
net/built-in.o:(.data+0x9998): undefined reference to `rpitcp_prot'
Makefile:972: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1