kernel headers: Update comparison logic

    return 0

def parse_bp_for_headers(file_name, headers):

  parsing_headers = False

  pattern = re.compile("gen_headers_[a-zA-Z0-9]+\s*=\s*\[\s*")

  with open(file_name, 'r') as f:

    for line in f:

      line = line.strip()

      if pattern.match(line):

        parsing_headers = True

        continue

      if line.find("]") != -1 and parsing_headers:

        break

      if not parsing_headers:

        continue

      if line.find("//") == 0:

        continue

      headers.add(line[1:-2])

def headers_diff(old_file, new_file):

  old_headers = set()

  new_headers = set()

  diff_detected = False

  parse_bp_for_headers(old_file, old_headers)

  parse_bp_for_headers(new_file, new_headers)

  diff = old_headers - new_headers

  if len(diff):

    diff_detected = True

    print("Headers to remove:")

    for x in diff:

      print("\t{}".format(x))

  diff = new_headers - old_headers

  if len(diff):

    diff_detected = True

    print("Headers to add:")

    for x in diff:

      print("\t{}".format(x))

  return diff_detected

def gen_headers(

    verbose, header_arch, gen_dir, arch_asm_kbuild, asm_generic_kbuild, module_dir,

    The number of errors encountered.

  """

  if not filecmp.cmp(old_gen_headers_bp, new_gen_headers_bp):

  if headers_diff(old_gen_headers_bp, new_gen_headers_bp):

    print('error: gen_headers blueprints file is out of date, suggested fix:')

    print('cp %s %s' % (new_gen_headers_bp, old_gen_headers_bp))

    print('#######Please add or remove the above mentioned headers from %s' % (old_gen_headers_bp))

    print('then re-run the build')

    return 1