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-rw-r--r--mm/pagewalk.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index f7929406e776..2f5cf10ff660 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -176,7 +176,8 @@ static int walk_hugetlb_range(struct vm_area_struct *vma,
* associated range, and a copy of the original mm_walk for access to
* the ->private or ->mm fields.
*
- * No locks are taken, but the bottom level iterator will map PTE
+ * Usually no locks are taken, but splitting transparent huge page may
+ * take page table lock. And the bottom level iterator will map PTE
* directories from highmem if necessary.
*
* If any callback returns a non-zero value, the walk is aborted and
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