From: Yang Shi <yang.shi@linux.alibaba.com>
To: mhocko@suse.com, richardw.yang@linux.intel.com,
akpm@linux-foundation.org
Cc: yang.shi@linux.alibaba.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH] mm: move_pages: fix the return value if there are not-migrated pages
Date: Sat, 18 Jan 2020 13:26:43 +0800 [thread overview]
Message-ID: <1579325203-16405-1-git-send-email-yang.shi@linux.alibaba.com> (raw)
The 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 what pre-v4.17 did.
Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move")
Cc: Michal Hocko <mhocko@suse.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: <stable@vger.kernel.org> [4.17+]
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
---
mm/migrate.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 86873b6..3e75432 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1659,8 +1659,11 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
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)
--
1.8.3.1
next reply other threads:[~2020-01-18 5:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-18 5:26 Yang Shi [this message]
2020-01-19 2:37 ` [PATCH] mm: move_pages: fix the return value if there are not-migrated pages Wei Yang
2020-01-19 2:57 ` Wei Yang
2020-01-19 5:47 ` Yang Shi
2020-01-19 5:44 ` Yang Shi
2020-01-20 13:06 ` Michal Hocko
2020-01-20 13:17 ` Michal Hocko
2020-01-21 1:44 ` Wei Yang
2020-01-21 8:40 ` Michal Hocko
2020-01-21 19:01 ` Yang Shi
2020-01-22 8:06 ` Michal Hocko
2020-01-22 17:26 ` Yang Shi
2020-01-22 17:35 ` Michal Hocko
2020-01-23 3:29 ` Wei Yang
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