mm: fix status code which move_pages() returns for zero page

The manpage for move_pages(2) specifies that status code for zero page is
supposed to be -EFAULT.  Currently kernel return -ENOENT in this case.

follow_page() can do it for us, if we would ask for FOLL_DUMP.  The use of
FOLL_DUMP also means that the upper layer page tables pages are no longer
allocated.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/migrate.c b/mm/migrate.c
index eb42671..5c08cab 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1226,7 +1226,9 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
                if (!vma || pp->addr < vma->vm_start || !vma_migratable(vma))
                        goto set_status;
 
-               page = follow_page(vma, pp->addr, FOLL_GET|FOLL_SPLIT);
+               /* FOLL_DUMP to ignore special (like zero) pages */
+               page = follow_page(vma, pp->addr,
+                               FOLL_GET | FOLL_SPLIT | FOLL_DUMP);
 
                err = PTR_ERR(page);
                if (IS_ERR(page))
@@ -1236,10 +1238,6 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
                if (!page)
                        goto set_status;
 
-               /* Use PageReserved to check for zero page */
-               if (PageReserved(page))
-                       goto put_and_set;
-
                pp->page = page;
                err = page_to_nid(page);
 
@@ -1396,18 +1394,14 @@ static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages,
                if (!vma || addr < vma->vm_start)
                        goto set_status;
 
-               page = follow_page(vma, addr, 0);
+               /* FOLL_DUMP to ignore special (like zero) pages */
+               page = follow_page(vma, addr, FOLL_DUMP);
 
                err = PTR_ERR(page);
                if (IS_ERR(page))
                        goto set_status;
 
-               err = -ENOENT;
-               /* Use PageReserved to check for zero page */
-               if (!page || PageReserved(page))
-                       goto set_status;
-
-               err = page_to_nid(page);
+               err = page ? page_to_nid(page) : -ENOENT;
 set_status:
                *status = err;