The problem is still the same.
wk_cpu = __smp_processor_id();
^~~~~~~~~~~~~~~~~~
Full bulid log:
`

./gen_compat_def > compat_def.h-
Test function xt_family linux/netfilter_ipv4/ip_tables.h undeclared
Test struct timeval linux/ktime.h declared
Test struct proc_ops linux/proc_fs.h undeclared
Test function synchronize_sched linux/rcupdate.h declared
Test function nf_bridge_info_get linux/netfilter_bridge.h undeclared
Test struct vlan_dev_priv linux/if_vlan.h declared
Test function put_unaligned_be24 asm/unaligned.h undeclared
Test function totalram_pages linux/mm.h undeclared
Test symbol totalram_pages linux/mm.h declared
Test member nf_ct_event_notifier.ct_event net/netfilter/nf_conntrack_ecache.h undeclared
Test function register_sysctl_paths linux/sysctl.h declared
mv compat_def.h- compat_def.h
Compiling 2.6-17-g0eb2092 for kernel 4.9.210
make -C /lib/modules/4.9.0-12-amd64/build M=/home/airmaster/ipt-netflow modules
make[1]: вход в каталог «/usr/src/linux-headers-4.9.0-12-amd64»
CC [M] /home/airmaster/ipt-netflow/ipt_NETFLOW.o
/home/airmaster/ipt-netflow/ipt_NETFLOW.c: In function ‘netflow_work_fn’:
/home/airmaster/ipt-netflow/ipt_NETFLOW.c:4506:11: error: implicit declaration of function ‘__smp_processor_id’ [-Werror=implicit-function-declaration]
wk_cpu = __smp_processor_id();
^~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
/usr/src/linux-headers-4.9.0-12-common/scripts/Makefile.build:318: ошибка выполнения рецепта для цели «/home/airmaster/ipt-netflow/ipt_NETFLOW.o»
make[4]: *** [/home/airmaster/ipt-netflow/ipt_NETFLOW.o] Ошибка 1
/usr/src/linux-headers-4.9.0-12-common/Makefile:1552: ошибка выполнения рецепта для цели «module/home/airmaster/ipt-netflow»
make[3]: *** [module/home/airmaster/ipt-netflow] Ошибка 2
Makefile:152: ошибка выполнения рецепта для цели «sub-make»
make[2]: *** [sub-make] Ошибка 2
Makefile:8: ошибка выполнения рецепта для цели «all»
make[1]: *** [all] Ошибка 2
make[1]: выход из каталога «/usr/src/linux-headers-4.9.0-12-amd64»
Makefile:26: ошибка выполнения рецепта для цели «ipt_NETFLOW.ko»
make: *** [ipt_NETFLOW.ko] Ошибка 2

`
As far as I understood, this problem has already been fixed, but for me it did not bring any result, or I misunderstood what needed to be done.
Thanks