[IDAPython]: Fast make everywhere as function in specified region

def make_all_func(start,end):
    cur = start
    while True:
        print "Making %x" % cur
        idc.MakeFunction(cur)
        endchunk = idc.get_fchunk_attr(cur, FUNCATTR_END)
        cur = endchunk if endchunk != BADADDR else NextAddr(cur)
        if cur > end:
            break
            
make_all_func(0x828001148, 0x828007D84)

This version supports the function chunk, which will be much more robust than func.endEA

Enjoy!