insmod error

[gqdw]

 uname -a 
Linux ecs-hq-ipv6test 2.6.32-754.35.1.el6.x86_64 #1 SMP Sat Nov 7 12:42:14 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

 src]# make 
make CONFIG_TOA=m  -C /lib/modules/`uname -r`/build M=`pwd` modules
make[1]: Entering directory `/usr/src/kernels/2.6.32-754.35.1.el6.x86_64'
  CC [M]  /root/master/TCP_option_address-master/src/toa.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "kallsyms_lookup_name" [/root/master/TCP_option_address-master/src/toa.ko] undefined!
  CC      /root/master/TCP_option_address-master/src/toa.mod.o
  LD [M]  /root/master/TCP_option_address-master/src/toa.ko.unsigned
  NO SIGN [M] /root/master/TCP_option_address-master/src/toa.ko
make[1]: Leaving directory `/usr/src/kernels/2.6.32-754.35.1.el6.x86_64'


src]# insmod toa.ko
insmod: error inserting 'toa.ko': -1 Unknown symbol in module
[root@ecs-hq-ipv6test src]# dmesg |tail 
Microcode Update Driver: v2.00 <[email protected]>, Peter Oruba
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
type=1305 audit(1706086317.409:3): audit_pid=2108 old=0 auid=4294967295 ses=4294967295 res=1
eth0: no IPv6 routers present
toa: Unknown symbol kallsyms_lookup_name
toa: Unknown symbol kallsyms_lookup_name