While I was doing some reading on system calls, I did a search for "syscalls.h" to find the header file in LXR. The search results puzzled me. There is a dozen of "syscalls.h" files coming from directories under "arch/_arch_name_/include/asm". These are ok, they are architecture specific definitions or something else needed. The question is why do we have two different "syscalls.h" headers under both /include/linux and /include/asm-generic?
Also, I want to find out that what /include/linux headers are for and what /include/asm-generic headers are for. How do they differentiate between each other? What is the logic behind having two separate header folders? How do they relate to each other?