When a cpu is onlined on memory-less-node box, kernel panics due to
touch NULL pointer of pgdat->kswapd. Current kswapd runs only
nodes which have memory. So, calling of set_cpus_allowed()
is not necessary for memory-less node.
This is fix for it.
Signed-off-by: Yasunori Goto <[email protected]>
---
mm/vmscan.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: current/mm/vmscan.c
===================================================================
--- current.orig/mm/vmscan.c 2007-09-03 16:36:18.000000000 +0900
+++ current/mm/vmscan.c 2007-09-11 13:02:20.000000000 +0900
@@ -1843,9 +1843,11 @@ static int __devinit cpu_callback(struct
{
pg_data_t *pgdat;
cpumask_t mask;
+ int nid;
if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) {
- for_each_online_pgdat(pgdat) {
+ for_each_node_state(nid, N_HIGH_MEMORY) {
+ pgdat = NODE_DATA(nid);
mask = node_to_cpumask(pgdat->node_id);
if (any_online_cpu(mask) != NR_CPUS)
/* One of our CPUs online: restore mask */
--
Yasunori Goto