mm/vmscan: fix error number for failed kthread

Fix the return value while failing to create the kswapd kernel thread.
Also, the error message is prioritized as KERN_ERR.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f6fdae7a8d4c..d16bf5a53266 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3126,9 +3126,9 @@ int kswapd_run(int nid)
         if (IS_ERR(pgdat->kswapd)) {
                 /* failure at boot is fatal */
                 BUG_ON(system_state == SYSTEM_BOOTING);
-                printk("Failed to start kswapd on node %d\n",nid);
                 pgdat->kswapd = NULL;
-                ret = -1;
+                pr_err("Failed to start kswapd on node %d\n", nid);
+                ret = PTR_ERR(pgdat->kswapd);
         }
         return ret;
 }