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authorYasunori Goto <y-goto@jp.fujitsu.com>2007-10-16 01:25:40 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:59 -0700
commit58c0a4a7864b2dad6da4090813322fcd29a11c92 (patch)
tree239da4074ced93ee6918fdb03e3839ef721191bb /mm/vmscan.c
parentmemoryless nodes: fixup uses of node_online_map in generic code (diff)
downloadlinux-dev-58c0a4a7864b2dad6da4090813322fcd29a11c92.tar.xz
linux-dev-58c0a4a7864b2dad6da4090813322fcd29a11c92.zip
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>
Diffstat (limited to '')
-rw-r--r--mm/vmscan.c4
1 files changed, 3 insertions, 1 deletions
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 */