[PATCH 2/2] mm/vmscan: fix error number for failed kthread

[Wanpeng Li <liwanp@linux.vnet.ibm.com>]

From: Gavin Shan <shangw@linux.vnet.ibm.com>

The patch fixes 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>
---
 mm/vmscan.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8d01243..ddf00a7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3101,9 +3101,10 @@ 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);
-		ret = -1;
+		pr_err("Failed to start kswapd on node %d\n", nid);
+		ret = PTR_ERR(pgdat->kswapd);
 	}
+
 	return ret;
 }
 
-- 
1.7.7.6

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