The patch titled
Subject: mm: fix status code which move_pages() returns for zero page
has been added to the -mm tree. Its filename is
mm-fix-status-code-move_pages-returns-for-zero-page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fix-status-code-move_pages-returns-for-zero-page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fix-status-code-move_pages-returns-for-zero-page.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff -puN mm/migrate.c~mm-fix-status-code-move_pages-returns-for-zero-page mm/migrate.c
--- a/mm/migrate.c~mm-fix-status-code-move_pages-returns-for-zero-page
+++ a/mm/migrate.c
@@ -1222,7 +1222,9 @@ static int do_move_page_to_node_array(st
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))
@@ -1232,10 +1234,6 @@ static int do_move_page_to_node_array(st
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);
@@ -1392,18 +1390,14 @@ static void do_pages_stat_array(struct m
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;
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-fix-status-code-move_pages-returns-for-zero-page.patch
page-flags-trivial-cleanup-for-pagetrans-helpers.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages.patch
page-flags-define-pg_locked-behavior-on-compound-pages.patch
page-flags-define-behavior-of-fs-io-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-lru-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-lru-related-flags-on-compound-pages-fix.patch
page-flags-define-behavior-slb-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-xen-related-flags-on-compound-pages.patch
page-flags-define-pg_reserved-behavior-on-compound-pages.patch
page-flags-define-pg_swapbacked-behavior-on-compound-pages.patch
page-flags-define-pg_swapcache-behavior-on-compound-pages.patch
page-flags-define-pg_mlocked-behavior-on-compound-pages.patch
page-flags-define-pg_uncached-behavior-on-compound-pages.patch
page-flags-define-pg_uptodate-behavior-on-compound-pages.patch
page-flags-look-on-head-page-if-the-flag-is-encoded-in-page-mapping.patch
mm-sanitize-page-mapping-for-tail-pages.patch
include-linux-page-flagsh-rename-macros-to-avoid-collisions.patch
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