pagewalk: fix code comment for THP

Commit bae9c19 ("thp: split_huge_page_mm/vma") changed locking behavior of walk_page_range(). Thus this patch changes the comment too. Signed-off-by: KOSAKI Motohiro <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: Hiroyuki Kamezawa <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Matt Mackall <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
mrcsosa · Jul 26, 2011 · dd78553 · dd78553
1 parent c27fe4c
commit dd78553
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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