Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 apic updates from Ingo Molnar:
 "Misc changes:

   - optimize (reduce) IRQ handler tracing overhead (Wanpeng Li)

   - clean up MSR helpers (Borislav Petkov)

   - fix build warning on some configs (Sebastian Andrzej Siewior)"

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/msr: Cleanup/streamline MSR helpers
  x86/apic: Prevent tracing on apic_msr_write_eoi()
  x86/msr: Add wrmsr_notrace()
  x86/apic: Get rid of "warning: 'acpi_ioapic_lock' defined but not used"

arch/x86/kernel/acpi/boot.c

@@ -76,6 +76,7 @@ int acpi_fix_pin2_polarity __initdata;
 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
 #endif
 
+#ifdef CONFIG_X86_IO_APIC
 /*
  * Locks related to IOAPIC hotplug
  * Hotplug side:
@@ -88,6 +89,7 @@ static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  *			->ioapic_lock
  */
 static DEFINE_MUTEX(acpi_ioapic_lock);
+#endif
 
 /* --------------------------------------------------------------------------
                               Boot-time Configuration

arch/x86/kernel/apic/apic.c

@@ -2263,6 +2263,7 @@ void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v))
 	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 		/* Should happen once for each apic */
 		WARN_ON((*drv)->eoi_write == eoi_write);
+		(*drv)->native_eoi_write = (*drv)->eoi_write;
 		(*drv)->eoi_write = eoi_write;
 	}
 }

arch/x86/kernel/kvm.c

@@ -308,7 +308,7 @@ static void kvm_register_steal_time(void)
 
 static DEFINE_PER_CPU(unsigned long, kvm_apic_eoi) = KVM_PV_EOI_DISABLED;
 
-static void kvm_guest_apic_eoi_write(u32 reg, u32 val)
+static notrace void kvm_guest_apic_eoi_write(u32 reg, u32 val)
 {
 	/**
 	 * This relies on __test_and_clear_bit to modify the memory
@@ -319,7 +319,7 @@ static void kvm_guest_apic_eoi_write(u32 reg, u32 val)
 	 */
 	if (__test_and_clear_bit(KVM_PV_EOI_BIT, this_cpu_ptr(&kvm_apic_eoi)))
 		return;
-	apic_write(APIC_EOI, APIC_EOI_ACK);
+	apic->native_eoi_write(APIC_EOI, APIC_EOI_ACK);
 }
 
 static void kvm_guest_cpu_init(void)

arch/x86/kernel/smp.c

@@ -261,10 +261,8 @@ static inline void __smp_reschedule_interrupt(void)
 
 __visible void smp_reschedule_interrupt(struct pt_regs *regs)
 {
-	irq_enter();
 	ack_APIC_irq();
 	__smp_reschedule_interrupt();
-	irq_exit();
 	/*
 	 * KVM uses this interrupt to force a cpu out of guest mode
 	 */