From: Wei Yang <richardw.yang@linux.intel.com> [ Upstream commit dfe9aa23cab7880a794db9eb2d176c00ed064eb6 ] If we get here after successfully adding page to list, err would be 1 to indicate the page is queued in the list. Current code has two problems: * on success, 0 is not returned * on error, if add_page_for_migratioin() return 1, and the following err1 from do_move_pages_to_node() is set, the err1 is not returned since err is 1 And these behaviors break the user interface. Link: http://lkml.kernel.org/r/20200119065753.21694-1-richardw.yang@linux.intel.co... Fixes: e0153fc2c760 ("mm: move_pages: return valid node id in status if the page is already on the target node"). Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Acked-by: Yang Shi <yang.shi@linux.alibaba.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index 593557c..70f8ad4 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1672,7 +1672,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, err1 = do_move_pages_to_node(mm, &pagelist, current_node); if (!err1) err1 = store_status(status, start, current_node, i - start); - if (!err) + if (err >= 0) err = err1; out: return err; -- 1.8.3