3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nathan Fontenot <nfont@xxxxxxxxxxxxxxxxxx>
commit dd023217e17e72b46fb4d49c7734c426938c3dba upstream.
The topology update code that updates the cpu node registration in sysfs
should not be called while in stop_machine(). The register/unregister
calls take a lock and may sleep.
This patch moves these calls outside of the call to stop_machine().
Signed-off-by: Nathan Fontenot <nfont@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/numa.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1433,11 +1433,9 @@ static int update_cpu_topology(void *dat
if (cpu != update->cpu)
continue;
- unregister_cpu_under_node(update->cpu, update->old_nid);
unmap_cpu_from_node(update->cpu);
map_cpu_to_node(update->cpu, update->new_nid);
vdso_getcpu_init();
- register_cpu_under_node(update->cpu, update->new_nid);
}
return 0;
@@ -1485,6 +1483,9 @@ int arch_update_cpu_topology(void)
stop_machine(update_cpu_topology, &updates[0], &updated_cpus);
for (ud = &updates[0]; ud; ud = ud->next) {
+ unregister_cpu_under_node(ud->cpu, ud->old_nid);
+ register_cpu_under_node(ud->cpu, ud->new_nid);
+
dev = get_cpu_device(ud->cpu);
if (dev)
kobject_uevent(&dev->kobj, KOBJ_CHANGE);
--
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