ACPI now honors "noapic" cmdline option

config tweaks from Dominik Brodowski

arch/i386/kernel/acpi/boot.c

@@ -420,6 +420,15 @@ acpi_boot_init (void)
 		return 1;
         }
 
+	/*
+ 	 * if "noapic" boot option, don't look for IO-APICs
+	 */
+	if (skip_ioapic_setup) {
+		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
+			"due to 'noapic' option.\n");
+		return 1;
+	}
+
 	result = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic);
 	if (!result) { 
 		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");

arch/i386/kernel/dmi_scan.c

@@ -415,16 +415,19 @@ static __init int swab_apm_power_in_minutes(struct dmi_blacklist *d)
  * The MP1.4 table is right however and so SMP kernels tend to work. 
  */
  
-extern int skip_ioapic_setup;
 static __init int broken_pirq(struct dmi_blacklist *d)
 {
+
 	printk(KERN_INFO " *** Possibly defective BIOS detected (irqtable)\n");
 	printk(KERN_INFO " *** Many BIOSes matching this signature have incorrect IRQ routing tables.\n");
 	printk(KERN_INFO " *** If you see IRQ problems, in particular SCSI resets and hangs at boot\n");
 	printk(KERN_INFO " *** contact your hardware vendor and ask about updates.\n");
 	printk(KERN_INFO " *** Building an SMP kernel may evade the bug some of the time.\n");
 #ifdef CONFIG_X86_IO_APIC
-	skip_ioapic_setup = 0;
+	{
+		extern int skip_ioapic_setup;
+		skip_ioapic_setup = 0;
+	}
 #endif
 	return 0;
 }
@@ -516,7 +519,6 @@ static __init int print_if_true(struct dmi_blacklist *d)
 
 
 extern int acpi_disabled, acpi_force;
-extern int skip_ioapic_setup; 
 
 static __init __attribute__((unused)) int acpi_disable(struct dmi_blacklist *d) 
 { 
@@ -996,13 +998,15 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
  *	returns 1 or we hit the end.
  */
  
-#define	ACPI_BLACKLIST_CUTOFF_YEAR	2001
 
 static __init void dmi_check_blacklist(void)
 {
 	struct dmi_blacklist *d;
 	int i;
 		
+#ifdef	CONFIG_ACPI_BOOT
+#define	ACPI_BLACKLIST_CUTOFF_YEAR	2001
+
 	if (dmi_ident[DMI_BIOS_DATE]) { 
 		char *s = strrchr(dmi_ident[DMI_BIOS_DATE], '/'); 
 		if (s) { 
@@ -1020,6 +1024,7 @@ static __init void dmi_check_blacklist(void)
 			} 
 		}
 	}
+#endif
 
 	d=&dmi_blacklist[0];
 	while(d->callback)

arch/i386/kernel/setup.c

@@ -542,6 +542,11 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 			acpi_ht = 1;
 			if (!acpi_force) acpi_disabled = 1;
 		}
+
+		/* disable IO-APIC */
+		else if (!memcmp(from, "noapic", 6)) {
+			skip_ioapic_setup = 1;
+		}
 #endif
 
 		/*

drivers/acpi/Kconfig

@@ -6,7 +6,7 @@ menu "ACPI (Advanced Configuration and Power Interface) Support"
 
 config ACPI_HT
 	bool "ACPI Processor Enumeration for HT"
-	depends on (X86 && X86_LOCAL_APIC)
+	depends on X86
 	default y
 	---help---
 	  ACPI enumerates both logical (a.k.a. Hyper-Threaded -- HT)