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-rw-r--r--arch/powerpc/kernel/process.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 57703994a06..c225cf154bf 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -888,3 +888,35 @@ 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