mm_init() functions in kernel code

Hi, I saw two mm_init functions in the kernel source code. 1) init/main.c (http://lxr.linux.no/#linux+v2.6.38/init/main.c#L530) 2) kernel/fork.c (http://lxr.linux.no/#linux+v2.6.38/kernel/fork.c#L482) Are the above functions go inside a single binary? How this doesn't produce a redefinition error? Thanks, Vikram