x86: add x2apic config

Impact: cleanup

so could deselect x2apic
and INTR_REMAP will select x2apic

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

6 files changed, 21 insertions, 18 deletions

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 24f357e..1cefd21 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -117,8 +117,8 @@ obj-$(CONFIG_SWIOTLB)			+= pci-swiotlb_64.o # NB rename without _64
 # 64 bit specific files
 ifeq ($(CONFIG_X86_64),y)
         obj-y				+= genapic_64.o genapic_flat_64.o
-        obj-y				+= genx2apic_cluster.o
-        obj-y				+= genx2apic_phys.o
+        obj-$(CONFIG_X86_X2APIC)	+= genx2apic_cluster.o
+        obj-$(CONFIG_X86_X2APIC)	+= genx2apic_phys.o
 	obj-$(CONFIG_X86_UV)		+= genx2apic_uv_x.o tlb_uv.o
 	obj-$(CONFIG_X86_UV)		+= bios_uv.o uv_irq.o uv_sysfs.o
         obj-$(CONFIG_X86_PM_TIMER)	+= pmtimer_64.o
diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index a894eea..004aa1c 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -112,11 +112,7 @@ static __init int setup_apicpmtimer(char *s)
 __setup("apicpmtimer", setup_apicpmtimer);
 #endif
 
-#ifdef CONFIG_X86_64
-#define HAVE_X2APIC
-#endif
-
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X86_X2APIC
 int x2apic;
 /* x2apic enabled before OS handover */
 static int x2apic_preenabled;
@@ -269,7 +265,7 @@ static struct apic_ops xapic_ops = {
 struct apic_ops __read_mostly *apic_ops = &xapic_ops;
 EXPORT_SYMBOL_GPL(apic_ops);
 
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X86_X2APIC
 static void x2apic_wait_icr_idle(void)
 {
 	/* no need to wait for icr idle in x2apic */
@@ -1320,11 +1316,14 @@ void __cpuinit end_local_APIC_setup(void)
 	apic_pm_activate();
 }
 
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X86_X2APIC
 void check_x2apic(void)
 {
 	int msr, msr2;
 
+	if (!cpu_has_x2apic)
+		return;
+
 	rdmsr(MSR_IA32_APICBASE, msr, msr2);
 
 	if (msr & X2APIC_ENABLE) {
@@ -1338,6 +1337,9 @@ void enable_x2apic(void)
 {
 	int msr, msr2;
 
+	if (!x2apic)
+		return;
+
 	rdmsr(MSR_IA32_APICBASE, msr, msr2);
 	if (!(msr & X2APIC_ENABLE)) {
 		pr_info("Enabling x2apic\n");
@@ -1439,7 +1441,7 @@ end:
 
 	return;
 }
-#endif /* HAVE_X2APIC */
+#endif /* CONFIG_X86_X2APIC */
 
 #ifdef CONFIG_X86_64
 /*
@@ -1570,7 +1572,7 @@ void __init early_init_lapic_mapping(void)
  */
 void __init init_apic_mappings(void)
 {
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X86_X2APIC
 	if (x2apic) {
 		boot_cpu_physical_apicid = read_apic_id();
 		return;
@@ -1634,9 +1636,7 @@ int __init APIC_init_uniprocessor(void)
 	}
 #endif
 
-#ifdef HAVE_X2APIC
 	enable_IR_x2apic();
-#endif
 #ifdef CONFIG_X86_64
 	default_setup_apic_routing();
 #endif
@@ -2021,7 +2021,7 @@ static int lapic_resume(struct sys_device *dev)
 
 	local_irq_save(flags);
 
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X86_X2APIC
 	if (x2apic)
 		enable_x2apic();
 	else
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 4db150e..4b5d13e 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1051,7 +1051,7 @@ void __cpuinit cpu_init(void)
 	barrier();
 
 	check_efer();
-	if (cpu != 0 && x2apic)
+	if (cpu != 0)
 		enable_x2apic();
 
 	/*
diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c
index 820dea5..cdc4772 100644
--- a/arch/x86/kernel/genapic_64.c
+++ b/arch/x86/kernel/genapic_64.c
@@ -35,8 +35,10 @@ static struct genapic *apic_probe[] __initdata = {
 #ifdef CONFIG_X86_UV
 	&apic_x2apic_uv_x,
 #endif
+#ifdef CONFIG_X86_X2APIC
 	&apic_x2apic_phys,
 	&apic_x2apic_cluster,
+#endif
 	&apic_physflat,
 	NULL,
 };
@@ -46,10 +48,12 @@ static struct genapic *apic_probe[] __initdata = {
  */
 void __init default_setup_apic_routing(void)
 {
+#ifdef CONFIG_X86_X2APIC
 	if (apic == &apic_x2apic_phys || apic == &apic_x2apic_cluster) {
 		if (!intr_remapping_enabled)
 			apic = &apic_flat;
 	}
+#endif
 
 	if (apic == &apic_flat) {
 		if (max_physical_apicid >= 8)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 8fce6c7..43d9644 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -836,8 +836,7 @@ void __init setup_arch(char **cmdline_p)
 #else
 	num_physpages = max_pfn;
 
- 	if (cpu_has_x2apic)
- 		check_x2apic();
+	check_x2apic();
 
 	/* How many end-of-memory variables you have, grandma! */
 	/* need this before calling reserve_initrd */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 1083495..b5f2b69 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1128,8 +1128,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	current_thread_info()->cpu = 0;  /* needed? */
 	set_cpu_sibling_map(0);
 
-#ifdef CONFIG_X86_64
 	enable_IR_x2apic();
+#ifdef CONFIG_X86_64
 	default_setup_apic_routing();
 #endif