diff options
Diffstat (limited to 'drivers/idle')
| -rw-r--r-- | drivers/idle/intel_idle.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 5dc7ea4b6bc4..5db5e3176f6a 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -913,8 +913,7 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state = &drv->states[index]; unsigned long eax = flg2MWAIT(state->flags); unsigned int cstate; - - cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1; + bool uninitialized_var(tick); /* * NB: if CPUIDLE_FLAG_TLB_FLUSHED is set, this idle transition @@ -923,12 +922,19 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev, * useful with this knowledge. */ - if (!(lapic_timer_reliable_states & (1 << (cstate)))) - tick_broadcast_enter(); + if (!static_cpu_has(X86_FEATURE_ARAT)) { + cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & + MWAIT_CSTATE_MASK) + 1; + tick = false; + if (!(lapic_timer_reliable_states & (1 << (cstate)))) { + tick = true; + tick_broadcast_enter(); + } + } mwait_idle_with_hints(eax, ecx); - if (!(lapic_timer_reliable_states & (1 << (cstate)))) + if (!static_cpu_has(X86_FEATURE_ARAT) && tick) tick_broadcast_exit(); return index; |