ERROR:root:ld: vmlinux.o: in function `tcp_recvmsg_dmabuf':
tcp.c:(.text+0x669b21): undefined reference to `tcp_devmem_ar_key'
ld: tcp.c:(.text+0x669b68): undefined reference to `tcp_devmem_ar_key'
ld: tcp.c:(.text+0x669c54): undefined reference to `tcp_devmem_ar_key'
make[3]: *** [../scripts/Makefile.vmlinux:72: vmlinux.unstripped] Error 1
make[2]: *** [/home/kunit/testing/Makefile:1242: vmlinux] Error 2
make[1]: *** [/home/kunit/testing/Makefile:248: __sub-make] Error 2
make: *** [Makefile:248: __sub-make] Error 2