From 58c0a4a7864b2dad6da4090813322fcd29a11c92 Mon Sep 17 00:00:00 2001 From: Yasunori Goto Date: Tue, 16 Oct 2007 01:25:40 -0700 Subject: [PATCH] Fix panic of cpu online with memory less node 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmscan.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 8fd8ba1c67b4..cb8ad3c6e483 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1694,9 +1694,11 @@ static int __devinit cpu_callback(struct notifier_block *nfb, { 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 */ -- 2.20.1