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-rw-r--r--arch/powerpc/kernel/idle.c16
-rw-r--r--arch/powerpc/platforms/pseries/lpar.c4
2 files changed, 18 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index 2e782a36d8f2..3cd73d1fc427 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -46,6 +46,12 @@ static int __init powersave_off(char *arg)
}
__setup("powersave=off", powersave_off);
+#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_TRACEPOINTS)
+static const bool idle_uses_rcu = 1;
+#else
+static const bool idle_uses_rcu;
+#endif
+
/*
* The body of the idle task.
*/
@@ -56,7 +62,10 @@ void cpu_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
- tick_nohz_idle_enter_norcu();
+ if (idle_uses_rcu)
+ tick_nohz_idle_enter();
+ else
+ tick_nohz_idle_enter_norcu();
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
@@ -93,7 +102,10 @@ void cpu_idle(void)
HMT_medium();
ppc64_runlatch_on();
- tick_nohz_idle_exit_norcu();
+ if (idle_uses_rcu)
+ tick_nohz_idle_exit();
+ else
+ tick_nohz_idle_exit_norcu();
preempt_enable_no_resched();
if (cpu_should_die())
cpu_die();
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 27a49508b410..52d429be6c76 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -555,6 +555,8 @@ void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
(*depth)++;
trace_hcall_entry(opcode, args);
+ if (opcode == H_CEDE)
+ rcu_idle_enter();
(*depth)--;
out:
@@ -575,6 +577,8 @@ void __trace_hcall_exit(long opcode, unsigned long retval,
goto out;
(*depth)++;
+ if (opcode == H_CEDE)
+ rcu_idle_exit();
trace_hcall_exit(opcode, retval, retbuf);
(*depth)--;