Reviewed do_mmap
More for do_mmap
Some error handling for do_munmap
Added code to flush the tlb
special_file_mmap
Tried to get sbin/init
special_file_fillpage
special_file_dirtypage
special_file_cleanpage
Realized what it means by checking the refcount
zero_mmap
Tried with different things
Some do_brk
Started to battle with memtest
Tried to battle with test_init