1 files changed, 32 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 1201880cab40..dd774c3c9302 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -886,3 +886,35 @@ void dump_stack(void)
         show_stack(current, NULL);
 }
 EXPORT_SYMBOL(dump_stack);
+
+#ifdef CONFIG_PPC64
+void ppc64_runlatch_on(void)
+{
+        unsigned long ctrl;
+
+        if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) {
+                HMT_medium();
+
+                ctrl = mfspr(SPRN_CTRLF);
+                ctrl |= CTRL_RUNLATCH;
+                mtspr(SPRN_CTRLT, ctrl);
+
+                set_thread_flag(TIF_RUNLATCH);
+        }
+}
+
+void ppc64_runlatch_off(void)
+{
+        unsigned long ctrl;
+
+        if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) {
+                HMT_medium();
+
+                clear_thread_flag(TIF_RUNLATCH);
+
+                ctrl = mfspr(SPRN_CTRLF);
+                ctrl &= ~CTRL_RUNLATCH;
+                mtspr(SPRN_CTRLT, ctrl);
+        }
+}
+#endif