1 files changed, 29 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/mpic.c b/arch/ppc64/kernel/mpic.c
index 593ea5b82afa..e8fbab1df37f 100644
--- a/arch/ppc64/kernel/mpic.c
+++ b/arch/ppc64/kernel/mpic.c
@@ -792,6 +792,35 @@ void mpic_setup_this_cpu(void)
 #endif /* CONFIG_SMP */
 }
 
+/*
+ * XXX: someone who knows mpic should check this.
+ * do we need to eoi the ipi here (see xics comments)?
+ * or can we reset the mpic in the new kernel?
+ */
+void mpic_teardown_this_cpu(void)
+{
+        struct mpic *mpic = mpic_primary;
+        unsigned long flags;
+        u32 msk = 1 << hard_smp_processor_id();
+        unsigned int i;
+
+        BUG_ON(mpic == NULL);
+
+        DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
+        spin_lock_irqsave(&mpic_lock, flags);
+
+        /* let the mpic know we don't want intrs.  */
+        for (i = 0; i < mpic->num_sources ; i++)
+                mpic_irq_write(i, MPIC_IRQ_DESTINATION,
+                        mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk);
+
+        /* Set current processor priority to max */
+        mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
+
+        spin_unlock_irqrestore(&mpic_lock, flags);
+}
+
+
 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
 {
         struct mpic *mpic = mpic_primary;