diff options
Diffstat (limited to 'arch/powerpc/kernel/idle.c')
| -rw-r--r-- | arch/powerpc/kernel/idle.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c index 39a2baa6ad58..0a48bf5db6c8 100644 --- a/arch/powerpc/kernel/idle.c +++ b/arch/powerpc/kernel/idle.c @@ -39,9 +39,13 @@ #define cpu_should_die() 0 #endif +unsigned long cpuidle_disable = IDLE_NO_OVERRIDE; +EXPORT_SYMBOL(cpuidle_disable); + static int __init powersave_off(char *arg) { ppc_md.power_save = NULL; + cpuidle_disable = IDLE_POWERSAVE_OFF; return 0; } __setup("powersave=off", powersave_off); @@ -56,7 +60,9 @@ void cpu_idle(void) set_thread_flag(TIF_POLLING_NRFLAG); while (1) { - tick_nohz_stop_sched_tick(1); + tick_nohz_idle_enter(); + rcu_idle_enter(); + while (!need_resched() && !cpu_should_die()) { ppc64_runlatch_off(); @@ -93,7 +99,8 @@ void cpu_idle(void) HMT_medium(); ppc64_runlatch_on(); - tick_nohz_restart_sched_tick(); + rcu_idle_exit(); + tick_nohz_idle_exit(); preempt_enable_no_resched(); if (cpu_should_die()) cpu_die(); @@ -102,6 +109,29 @@ void cpu_idle(void) } } + +/* + * cpu_idle_wait - Used to ensure that all the CPUs come out of the old + * idle loop and start using the new idle loop. + * Required while changing idle handler on SMP systems. + * Caller must have changed idle handler to the new value before the call. + * This window may be larger on shared systems. + */ +void cpu_idle_wait(void) +{ + int cpu; + smp_mb(); + + /* kick all the CPUs so that they exit out of old idle routine */ + get_online_cpus(); + for_each_online_cpu(cpu) { + if (cpu != smp_processor_id()) + smp_send_reschedule(cpu); + } + put_online_cpus(); +} +EXPORT_SYMBOL_GPL(cpu_idle_wait); + int powersave_nap; #ifdef CONFIG_SYSCTL |