powerpc: Move cpu hotplug driver lock from pseries to powerpc

Move the defintion and lock helper routines for the cpu hotplug driver
lock from pseries to powerpc code to avoid build breaks for platforms
other than pseries that use cpu hotplug.

Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Acked-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index a521fb8a40ee..c2ee14498077 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -619,4 +619,16 @@ void __cpu_die(unsigned int cpu)
         if (smp_ops->cpu_die)
                 smp_ops->cpu_die(cpu);
 }
+
+static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex);
+
+void cpu_hotplug_driver_lock()
+{
+        mutex_lock(&powerpc_cpu_hotplug_driver_mutex);
+}
+
+void cpu_hotplug_driver_unlock()
+{
+        mutex_unlock(&powerpc_cpu_hotplug_driver_mutex);
+}
 #endif