1 files changed, 4 insertions, 0 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index 68a1a5b869a5..21a26cf51114 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -25,6 +25,7 @@
  *     page->flags PG_locked (lock_page)
  *       hugetlbfs_i_mmap_rwsem_key (in huge_pmd_share)
  *         mapping->i_mmap_rwsem
+ *           hugetlb_fault_mutex (hugetlbfs specific page fault mutex)
  *           anon_vma->rwsem
  *             mm->page_table_lock or pte_lock
  *               zone_lru_lock (in mark_page_accessed, isolate_lru_page)
@@ -1378,6 +1379,9 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
                 /*
                  * If sharing is possible, start and end will be adjusted
                  * accordingly.
+                 *
+                 * If called for a huge page, caller must hold i_mmap_rwsem
+                 * in write mode as it is possible to call huge_pmd_unshare.
                  */
                 adjust_range_if_pmd_sharing_possible(vma, &range.start,
                                                      &range.end);