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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>
This commit is contained in:
Yasunori Goto 2007-10-16 01:25:40 -07:00 committed by Linus Torvalds
parent 37b07e4163
commit 58c0a4a786
1 changed files with 3 additions and 1 deletions
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4
mm/vmscan.c
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@ -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 */