The patch titled
Fix panic of cpu online with memory less node
has been added to the -mm tree. Its filename is
fix-panic-of-cpu-online-with-memory-less-node.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Fix panic of cpu online with memory less node
From: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN mm/vmscan.c~fix-panic-of-cpu-online-with-memory-less-node mm/vmscan.c
--- a/mm/vmscan.c~fix-panic-of-cpu-online-with-memory-less-node
+++ a/mm/vmscan.c
@@ -1698,9 +1698,11 @@ 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 */
_
Patches currently in -mm which might be from y-goto@xxxxxxxxxxxxxx are
clean-up-duplicate-includes-in-include-linux-memory_hotplugh.patch
memoryless-nodes-fixup-uses-of-node_online_map-in-generic-code-fix.patch
update-n_high_memory-node-state-for-memory-hotadd-fix.patch
fix-panic-of-cpu-online-with-memory-less-node.patch
move-free-pages-between-lists-on-steal.patch
memory-unplug-v7-page-isolation.patch
memory-unplug-v7-page-offline.patch
memory-hotplug-hot-add-with-sparsemem-vmemmap.patch
memory-hotplug-hot-add-with-sparsemem-vmemmap-update.patch
-
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