mm/mm_init.c: extend init unavailable range doc info

Besides of the already described reasons the pages backended memory holes
might be persistent due to having memory mapped IO spaces behind those
ranges in the framework of flatmem kernel config.  Add such note to the
init_unavailable_range() method kdoc in order to point out to one more
reason of having the function executed for such regions.

[[email protected]: update per Mike]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Serge Semin <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions