3 files changed, 28 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 5c330c3366e4..36d67a8d7cbb 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -510,6 +510,7 @@ int __devinit start_secondary(void *unused)
 
 	smp_store_cpu_info(cpu);
 	set_dec(tb_ticks_per_jiffy);
+	preempt_disable();
 	cpu_callin_map[cpu] = 1;
 
 	smp_ops->setup_cpu(cpu);
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 32f215825e8d..0578f8387603 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -887,10 +887,6 @@ void altivec_unavailable_exception(struct pt_regs *regs)
 	die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
 }
 
-#ifdef CONFIG_PPC64
-extern perf_irq_t perf_irq;
-#endif
-
 #if defined(CONFIG_PPC64) || defined(CONFIG_E500)
 void performance_monitor_exception(struct pt_regs *regs)
 {
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 97082a4203ad..71a6addf9f7f 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -21,6 +21,7 @@
 #include <asm/iommu.h>
 #include <asm/dma.h>
 #include <asm/vio.h>
+#include <asm/prom.h>
 
 static const struct vio_device_id *vio_match_device(
 		const struct vio_device_id *, const struct vio_dev *);
@@ -265,7 +266,33 @@ static int vio_bus_match(struct device *dev, struct device_driver *drv)
 	return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
 }
 
+static int vio_hotplug(struct device *dev, char **envp, int num_envp,
+			char *buffer, int buffer_size)
+{
+	const struct vio_dev *vio_dev = to_vio_dev(dev);
+	char *cp;
+	int length;
+
+	if (!num_envp)
+		return -ENOMEM;
+
+	if (!vio_dev->dev.platform_data)
+		return -ENODEV;
+	cp = (char *)get_property(vio_dev->dev.platform_data, "compatible", &length);
+	if (!cp)
+		return -ENODEV;
+
+	envp[0] = buffer;
+	length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
+				vio_dev->type, cp);
+	if (buffer_size - length <= 0)
+		return -ENOMEM;
+	envp[1] = NULL;
+	return 0;
+}
+
 struct bus_type vio_bus_type = {
 	.name = "vio",
+	.hotplug = vio_hotplug,
 	.match = vio_bus_match,
 };