ACPI: Set max_cstate to 1 for early Opterons.
AMD Opteron processors before CG revision don't like C-states > 1.
This solves the long standing bugzilla #5303 and probably some more
on affected machines:
http://bugzilla.kernel.org/show_bug.cgi?id=5303
[ tglx@linutronix.de: reworked the patch so it does not wreck ia64 ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f996d0e..b52109b 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1658,6 +1658,7 @@
if (!first_run) {
dmi_check_system(processor_power_dmi_table);
+ max_cstate = acpi_processor_cstate_check(max_cstate);
if (max_cstate < ACPI_C_STATES_MAX)
printk(KERN_NOTICE
"ACPI: processor limited to max C-state %d\n",
