[PATCH] powerpc: don't enable cpu hotplug on mpic-based pseries

Olof Johansson
2007-10-10T00:03:20Z

Don't allow cpu hotplug on systems lacking XICS interrupt controller,
since current platform code is hardcoded for it.

Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 9711eb0..e29b890 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -252,6 +252,19 @@ static struct notifier_block pseries_smp_nb = {

static int __init pseries_cpu_hotplug_init(void)
{
+ struct device_node *np;
+ const char *typep;
+
+ for (np = NULL; (np = of_find_node_by_name(np,
+ "interrupt-controller"));) {
+ typep = of_get_property(np, "compatible", NULL);
+ if (strstr(typep, "open-pic")) {
+ printk(KERN_INFO "CPU Hotplug not supported on "
+ "systems using MPIC\n");
+ return 0;
+ }
+ }
+
rtas_stop_self_args.token = rtas_token("stop-self");
qcss_tok = rtas_token("query-cpu-stopped-state");