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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-06-29 13:58:28 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-06-29 13:58:28 +0200
commitdab20177b626198603176604c0f85ea1d67044ef (patch)
tree5720bb93323c2257a35ac096e2cb308c21938479
parent9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68 (diff)
downloadlinux-dab20177b626198603176604c0f85ea1d67044ef.tar.bz2
intel_idle: Eliminate redundant static variable
The value of the lapic_timer_always_reliable static variable in the intel_idle driver reflects the boot_cpu_has(X86_FEATURE_ARAT) value and so it also reflects the static_cpu_has(X86_FEATURE_ARAT) value. Hence, the lapic_timer_always_reliable check in intel_idle() is redundant and apart from this lapic_timer_always_reliable is only used in two places in which boot_cpu_has(X86_FEATURE_ARAT) can be used directly. Eliminate the lapic_timer_always_reliable variable in accordance with the above observations. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/idle/intel_idle.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index f4495841bf68..fa23a7ea01ac 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -66,8 +66,6 @@ static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
static unsigned long auto_demotion_disable_flags;
static bool disable_promotion_to_c1e;
-static bool lapic_timer_always_reliable;
-
struct idle_cpu {
struct cpuidle_state *state_table;
@@ -142,7 +140,7 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev,
if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED)
leave_mm(cpu);
- if (!static_cpu_has(X86_FEATURE_ARAT) && !lapic_timer_always_reliable) {
+ if (!static_cpu_has(X86_FEATURE_ARAT)) {
/*
* Switch over to one-shot tick broadcast if the target C-state
* is deeper than C1.
@@ -1562,7 +1560,7 @@ static int intel_idle_cpu_online(unsigned int cpu)
{
struct cpuidle_device *dev;
- if (!lapic_timer_always_reliable)
+ if (!boot_cpu_has(X86_FEATURE_ARAT))
tick_broadcast_enable();
/*
@@ -1655,16 +1653,13 @@ static int __init intel_idle_init(void)
goto init_driver_fail;
}
- if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */
- lapic_timer_always_reliable = true;
-
retval = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "idle/intel:online",
intel_idle_cpu_online, NULL);
if (retval < 0)
goto hp_setup_fail;
pr_debug("Local APIC timer is reliable in %s\n",
- lapic_timer_always_reliable ? "all C-states" : "C1");
+ boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1");
return 0;