7 files changed, 44 insertions, 2 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 6516359922ba..5c0107602b62 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1787,6 +1787,20 @@ static int __init parse_pci(char *arg)
 }
 early_param("pci", parse_pci);
 
+int __init acpi_mps_check(void)
+{
+#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
+/* mptable code is not built-in*/
+        if (acpi_disabled || acpi_noirq) {
+                printk(KERN_WARNING "MPS support code is not built-in.\n"
+                       "Using acpi=off or acpi=noirq or pci=noacpi "
+                       "may have problem\n");
+                return 1;
+        }
+#endif
+        return 0;
+}
+
 #ifdef CONFIG_X86_IO_APIC
 static int __init parse_acpi_skip_timer_override(char *arg)
 {
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index dd8de26b2786..4932d7813bcd 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -57,7 +57,7 @@ unsigned long mp_lapic_addr;
  *
  * -1=force-disable, +1=force-enable
  */
-static int enable_local_apic __initdata;
+int enable_local_apic;
 
 /* Local APIC timer verification ok */
 static int local_apic_timer_verify_ok;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c5330f601b68..56aee55cf8dc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -161,6 +161,10 @@ void __init setup_per_cpu_areas(void)
         char *ptr;
         int cpu;
 
+        /* no processor from mptable or madt */
+        if (!num_processors)
+                num_processors = 1;
+
 #ifdef CONFIG_HOTPLUG_CPU
         prefill_possible_map();
 #else
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 369d0fe1ff9c..cad4e893df05 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -677,6 +677,11 @@ void __init setup_arch(char **cmdline_p)
 
         parse_early_param();
 
+        if (acpi_mps_check()){
+                enable_local_apic = -1;
+                clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
+        }
+
         finish_e820_parsing();
 
         probe_roms();
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index a93300de4da9..175c696ec536 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -302,6 +302,11 @@ void __init setup_arch(char **cmdline_p)
 
         parse_early_param();
 
+        if (acpi_mps_check()) {
+                disable_apic = 1;
+                clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
+        }
+
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
         if (init_ohci1394_dma_early)
                 init_ohci1394_dma_on_all_controllers();
@@ -723,6 +728,10 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
                 cpu_devs[c->x86_vendor]->c_early_init(c);
 
         validate_pat_support(c);
+
+        /* early_param could clear that, but recall get it set again */
+        if (disable_apic)
+                clear_cpu_cap(c, X86_FEATURE_APIC);
 }
 
 /*
diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index 313bcaf4b6c3..9fe941cd843d 100644
--- a/include/asm-x86/apic.h
+++ b/include/asm-x86/apic.h
@@ -39,8 +39,12 @@ extern int apic_verbosity;
 extern int local_apic_timer_c2_ok;
 
 extern int ioapic_force;
-extern int disable_apic;
 
+#ifdef CONFIG_X86_64
+extern int disable_apic;
+#else
+extern int enable_local_apic;
+#endif
 /*
  * Basic functions accessing APICs.
  */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 41f7ce7edd7a..0601075d09a1 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -82,6 +82,7 @@ char * __acpi_map_table (unsigned long phys_addr, unsigned long size);
 int early_acpi_boot_init(void);
 int acpi_boot_init (void);
 int acpi_boot_table_init (void);
+int acpi_mps_check (void);
 int acpi_numa_init (void);
 
 int acpi_table_init (void);
@@ -250,6 +251,11 @@ static inline int acpi_boot_table_init(void)
         return 0;
 }
 
+static inline int acpi_mps_check(void)
+{
+        return 0;
+}
+
 static inline int acpi_check_resource_conflict(struct resource *res)
 {
         return 0;