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powerpc/numa: Do not update sysfs cpu registration from invalid context 

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@linux.vnet.ibm.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Nathan Fontenot 2013-06-24 22:08:05 -05:00 committed by Benjamin Herrenschmidt
parent ec207dcc91
commit dd023217e1
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/mm/numa.c
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@ -1432,11 +1432,9 @@ static int update_cpu_topology(void *data)
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;
@ -1484,6 +1482,9 @@ 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);