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From:   Wei Yang <richardw.yang@linux.intel.com>
To:     akpm@linux-foundation.org
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Wei Yang <richardw.yang@linux.intel.com>
Subject: [PATCH] mm/migrate.c: also overwrite error when it is bigger than zero
Date:   Fri, 17 Jan 2020 15:45:34 +0800
Message-Id: <20200117074534.25324-1-richardw.yang@linux.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

If we get here after successfully adding page to list, err would be
the number of pages in the list.

Current code has two problems:

  * on success, 0 is not returned
  * on error, the real error code is not returned

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 557da996b936..c3ef70de5876 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1677,7 +1677,7 @@ 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;
-- 
2.17.1