On Sat, Jan 18, 2020 at 02:47:54PM -0800, akpm@linux-foundation.org wrote:
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-... and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-move_pages-fix-the-return-value-...
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Hi Andrew
I am afraid this patch doesn't fully fix the problem. Please wait a minute.
From: Yang Shi yang.shi@linux.alibaba.com 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@linux.al... Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move") Signed-off-by: Yang Shi yang.shi@linux.alibaba.com Cc: Michal Hocko mhocko@suse.com Cc: Wei Yang richardw.yang@linux.intel.com Cc: stable@vger.kernel.org [4.17+] Signed-off-by: Andrew Morton akpm@linux-foundation.org
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;}_
Patches currently in -mm which might be from yang.shi@linux.alibaba.com are
mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch