Commit 58c0a4a7 authored Oct 16, 2007 by Yasunori Goto Committed by Linus Torvalds Oct 16, 2007

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 <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 37b07e41

mm/vmscan.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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 */