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Diffstat (limited to 'arch/x86/kernel/acpi/boot.c')
-rw-r--r--arch/x86/kernel/acpi/boot.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 29dc0c89d4a..d37593c2f43 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -47,7 +47,7 @@
#endif
static int __initdata acpi_force = 0;
-
+u32 acpi_rsdt_forced;
#ifdef CONFIG_ACPI
int acpi_disabled = 0;
#else
@@ -1374,6 +1374,17 @@ static void __init acpi_process_madt(void)
"Invalid BIOS MADT, disabling ACPI\n");
disable_acpi();
}
+ } else {
+ /*
+ * ACPI found no MADT, and so ACPI wants UP PIC mode.
+ * In the event an MPS table was found, forget it.
+ * Boot with "acpi=off" to use MPS on such a system.
+ */
+ if (smp_found_config) {
+ printk(KERN_WARNING PREFIX
+ "No APIC-table, disabling MPS\n");
+ smp_found_config = 0;
+ }
}
/*
@@ -1809,6 +1820,10 @@ static int __init parse_acpi(char *arg)
disable_acpi();
acpi_ht = 1;
}
+ /* acpi=rsdt use RSDT instead of XSDT */
+ else if (strcmp(arg, "rsdt") == 0) {
+ acpi_rsdt_forced = 1;
+ }
/* "acpi=noirq" disables ACPI interrupt routing */
else if (strcmp(arg, "noirq") == 0) {
acpi_noirq_set();