Hi everyone, I am trying to write hello world system call in linux but I am encountering the following error when I run 'sudo make': ... AR arch/x86/lib/lib.a LINK vmlinux LD vmlinux.o ld: cannot find hello: File format not recognized make: *** [vmlinux] Error 1 I have Linux 3.15.6 in my home directory and have created a hello folder in it. I also made changes to makefile, syscalls.h, and syscall_64.tbl in make file I replaced core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ with core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ hello Can anyone point out where I am going wrong. I have made the changes first and then I am trying 'sudo make'. I tried making some minor modifications and running it again 3 4 times but getting the same error and also it takes 2-3 hours of time. Jackson Isaac S5 B.Tech CSE Amrita Vishwa Vidyapeetham Jackson Isaac's Blog Github/JacksonIsaac