From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: + mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch added to -mm tree Date: Sat, 18 Jan 2020 14:47:54 -0800 Message-ID: <20200118224754.ufg_j%akpm@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:36368 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726960AbgARWrz (ORCPT ); Sat, 18 Jan 2020 17:47:55 -0500 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mm-commits@vger.kernel.org, stable@vger.kernel.org, richardw.yang@linux.intel.com, mhocko@suse.com, yang.shi@linux.alibaba.com 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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Yang Shi 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.alibaba.com Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move") Signed-off-by: Yang Shi Cc: Michal Hocko Cc: Wei Yang Cc: [4.17+] Signed-off-by: Andrew Morton --- 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@linux.alibaba.com are mm-move_pages-fix-the-return-value-if-there-are-not-migrated-pages.patch