linux-kernel - [PATCH] mm/migrate.c: also overwrite error when it is bigger than zero

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

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@...ux.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