Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH] intel_idle: Eliminate redundant static variable | Date | Wed, 24 Jun 2020 16:38:51 +0200 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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> --- drivers/idle/intel_idle.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)
Index: linux-pm/drivers/idle/intel_idle.c =================================================================== --- linux-pm.orig/drivers/idle/intel_idle.c +++ linux-pm/drivers/idle/intel_idle.c @@ -66,8 +66,6 @@ static struct cpuidle_device __percpu *i 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 c 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(unsigne { 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;
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