This build error is because the macro list_tail_rcu() isnot yet present in the mainline kernel.This patch is dependent on the patch : https://lore.kernel.org/linux-kernel-mentees/CAF65HP2SC89k9HJZfcLgeOMRPBKRyasCMiLo2gZgBKycjHuU6A@mail.gmail.com/T/#tThank you,Madhuparna