The patch titled
Subject: mm/migrate.c: move_pages: fix the return value if there are not-migrated pages
has been added to the -mm tree. Its filename is
mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch
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------------------------------------------------------
From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Subject: mm/migrate.c: move_pages: fix the return value if there are not-migrated pages
do_move_pages_to_node() might return > 0 value, the number of pages that
are not migrated, then the value will be returned to userspace directly.
But, move_pages() syscall would just return 0 or errno. So, we need reset
the return value to 0 for such case as pre-v4.17 did.
Link: http://lkml.kernel.org/r/1579325203-16405-1-git-send-email-yang.shi@xxxxxxxxxxxxxxxxx
Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move")
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.17+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/migrate.c~mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages
+++ a/mm/migrate.c
@@ -1659,8 +1659,11 @@ static int do_pages_move(struct mm_struc
goto out_flush;
err = do_move_pages_to_node(mm, &pagelist, current_node);
- if (err)
+ if (err) {
+ if (err > 0)
+ err = 0;
goto out;
+ }
if (i > start) {
err = store_status(status, start, current_node, i - start);
if (err)
_
Patches currently in -mm which might be from yang.shi@xxxxxxxxxxxxxxxxx are
mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch
