F-Stack – ERROR: modpost: “__uio_register_device” [/data/f-stack/dpdk/build/kernel/linux/igb_uio/igb_uio.ko] undefined!

Gentoo Linux에서 F-Stack 빌드시 igb_uio.ko 모듈이 없다고 나오는 경우는
Linux Kernel에서 Userspace I/O drivers를 활성화하고 재빌드하면 해결 됨.

[2902/2906] Generating kernel/linux/igb_uio/igb_uio with a custom command
FAILED: kernel/linux/igb_uio/igb_uio.ko
/usr/bin/make -C /lib/modules/6.7.0-gentoo/build M=/data/f-stack/dpdk/build/kernel/linux/igb_uio src=/data/f-stack/dpdk/kernel/linux/igb_uio EXTRA_CFLAGS=-I/data/f-stack/dpdk/kernel/linux/igb_uio/../../../lib/librte_eal/include modules
make: Entering directory '/usr/src/linux-6.7.0-gentoo'
  MODPOST /data/f-stack/dpdk/build/kernel/linux/igb_uio/Module.symvers
ERROR: modpost: "__uio_register_device" [/data/f-stack/dpdk/build/kernel/linux/igb_uio/igb_uio.ko] undefined!
ERROR: modpost: "uio_unregister_device" [/data/f-stack/dpdk/build/kernel/linux/igb_uio/igb_uio.ko] undefined!
ERROR: modpost: "uio_event_notify" [/data/f-stack/dpdk/build/kernel/linux/igb_uio/igb_uio.ko] undefined!
make[2]: *** [scripts/Makefile.modpost:145: /data/f-stack/dpdk/build/kernel/linux/igb_uio/Module.symvers] Error 1
make[1]: *** [/usr/src/linux-6.7.0-gentoo/Makefile:1863: modpost] Error 2
make: *** [Makefile:234: __sub-make] Error 2
make: Leaving directory '/usr/src/linux-6.7.0-gentoo'
[2905/2906] Compiling C object app/test/dpdk-test.p/test_ring.c.o
ninja: build stopped: subcommand failed.

Linux Kernel 6.7+ 버전에서 진행 하였음.

$ cd /usr/src/linux
$ make menuconfig
[*] Enable loadable module support
[*] Enable the block layer
Device Drivers --->
     <*> Userspace I/O drivers (UIO)

$ rm -f .version
$ make -j$(nproc)
$ make -j$(nproc) modules_install
$ make install
$ genkernel --install initramfs

$ cp /usr/src/linux/.config /boot/config-$(uname -r)
$ cp /usr/src/linux/System.map /boot/System.map-$(uname -r)
$ cp /usr/src/linux/arch/x86/boot/bzImage /boot/vmlinuz-$(uname -r)

$ grub-mkconfig -o /efi/grub/grub.cfg
$ reboot

$ grep CONFIG_UIO /boot/config-$(uname -r)
CONFIG_UIO=y