[ACPI] delete ACPI DMI/BIOS cutoff year by default

CONFIG_ACPI_BLACKLIST_YEAR=2001 for old behaviour

arch/i386/kernel/acpi/boot.c

@@ -830,10 +830,16 @@ acpi_boot_init (void)
 	 */
 	error = acpi_blacklisted();
 	if (error) {
-		printk(KERN_WARNING PREFIX "BIOS listed in blacklist, disabling ACPI support\n");
+		extern int acpi_force;
+
+		if (acpi_force) {
+			printk(KERN_WARNING PREFIX "acpi=force override\n");
+		} else {
+			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
 			disable_acpi();
 			return error;
 		}
+	}
 
 	/*
 	 * set sci_int and PM timer address

arch/i386/kernel/dmi_scan.c

@@ -444,27 +444,6 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 	{ NULL, }
 };
 
-	
-/*
- *	Walk the blacklist table running matching functions until someone 
- *	returns 1 or we hit the end.
- */
- 
-
-static __init void dmi_check_blacklist(void)
-{
-#ifdef	CONFIG_ACPI_BOOT
-	if (dmi_ident[DMI_BIOS_DATE]) { 
-		char *s = strrchr(dmi_ident[DMI_BIOS_DATE], '/'); 
- 		if (s && !acpi_force)
- 			acpi_bios_year(s+1);
-	}
-#endif
- 	dmi_check_system(dmi_blacklist);
-}
-
-	
-
 /*
  *	Process a DMI table entry. Right now all we care about are the BIOS
  *	and machine entries. For 2.5 we should pull the smbus controller info
@@ -521,7 +500,7 @@ void __init dmi_scan_machine(void)
 {
 	int err = dmi_iterate(dmi_decode);
 	if(err == 0)
-		dmi_check_blacklist();
+ 		dmi_check_system(dmi_blacklist);
 	else
 		printk(KERN_INFO "DMI not present.\n");
 }

drivers/acpi/Kconfig

@@ -220,6 +220,16 @@ config ACPI_CUSTOM_DSDT_FILE
 	help
 	  Enter the full path name to the file wich includes the AmlCode declaration.
 
+config ACPI_BLACKLIST_YEAR
+	int "Disable ACPI for systems before Jan 1st this year"
+	default 0
+	help
+	  enter a 4-digit year, eg. 2001 to disable ACPI by default
+	  on platforms with DMI BIOS date before January 1st that year.
+	  "acpi=force" can be used to override this mechanism.
+
+	  Enter 0 to disable this mechanism and allow ACPI to
+	  run by default no matter what the year.  (default)
 
 config ACPI_DEBUG
 	bool "Debug Statements"

drivers/acpi/blacklist.c

@@ -2,7 +2,9 @@
  *  blacklist.c
  *
  *  Check to see if the given machine has a known bad ACPI BIOS
+ *  or if the BIOS is too old.
  *
+ *  Copyright (C) 2004 Len Brown <len.brown@intel.com>
  *  Copyright (C) 2002 Andy Grover <andrew.grover@intel.com>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -30,6 +32,7 @@
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <acpi/acpi_bus.h>
+#include <linux/dmi.h>
 
 enum acpi_blacklist_predicates
 {
@@ -69,27 +72,45 @@ static struct acpi_blacklist_item acpi_blacklist[] __initdata =
 	{""}
 };
 
-#define	ACPI_BLACKLIST_CUTOFF_YEAR	2001
 
-/*
- * Notice: this is called from dmi_scan.c, which contains second (!) blacklist
- */
-void __init
-acpi_bios_year(char *s)
+#if	CONFIG_ACPI_BLACKLIST_YEAR
+
+static int __init
+blacklist_by_year(void)
 {
-	int year, disable = 0;
+	int year;
+	char *s = dmi_get_system_info(DMI_BIOS_DATE);
+
+	if (!s)
+		return 0;
+	if (!*s)
+		return 0;
+
+	s = strrchr(s, '/');
+	if (!s)
+		return 0;
+
+	s += 1;
 
 	year = simple_strtoul(s,NULL,0); 
-	if (year >= 1000) 
-		disable = year < ACPI_BLACKLIST_CUTOFF_YEAR; 
-	else if (year < 1 || (year > 90 && year <= 99))
-		disable = 1; 
-	if (disable) { 
-		printk(KERN_NOTICE "ACPI disabled because your bios is from %s and too old\n", s);
-		printk(KERN_NOTICE "You can enable it with acpi=force\n");
-		acpi_disabled = 1; 
+
+	if (year < 100) {		/* 2-digit year */
+		year += 1900;
+		if (year < 1996)	/* no dates < spec 1.0 */
+			year += 100;
 	}
+
+	if (year < CONFIG_ACPI_BLACKLIST_YEAR) {
+		printk(KERN_ERR PREFIX "BIOS age (%d) fails cutoff (%d), " 
+			"acpi=force is required to enable ACPI\n",
+			year, CONFIG_ACPI_BLACKLIST_YEAR);
+		return 1;
+	}
+	return 0;
 }
+#else
+static inline int blacklist_by_year(void) { return 0; }
+#endif
 
 int __init
 acpi_blacklisted(void)
@@ -141,6 +162,8 @@ acpi_blacklisted(void)
 		}
 	}
 
+	blacklisted += blacklist_by_year();
+
 	return blacklisted;
 }
 

drivers/acpi/bus.c

@@ -596,7 +596,10 @@ acpi_early_init (void)
 	acpi_status		status = AE_OK;
 	struct acpi_buffer	buffer = {sizeof(acpi_fadt), &acpi_fadt};
 
-	ACPI_FUNCTION_TRACE("acpi_bus_init");
+	ACPI_FUNCTION_TRACE("acpi_early_init");
+
+	if (acpi_disabled)
+		return;
 
 	/* enable workarounds, unless strict ACPI spec. compliance */
 	if (!acpi_strict)