mm-hugetlb-resv-map-memory-leak-for-placeholder-entries-v2

mm-hugetlb-resv-map-memory-leak-for-placeholder-entries-v2

Orabug: 22302415

V2: The original version of the patch did not correctly handle placeholder
    entries before the range to be deleted.  The new check is more specific
    and only matches placeholders at the start of range.

Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit fd2e0def3e0954be0453b625ce12c48e4a83bc70)
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>