Jan Beulich
2011-Aug-25 12:53 UTC
[Xen-devel] [PATCH] linux-2.6.18/ACPI: allow passing down C1 information if no other C-states exist
Otherwise Xen may end up not using MWAIT despite its availability.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -780,7 +780,7 @@ static int acpi_processor_get_power_info
current_count));
/* Validate number of power states discovered */
- if (current_count < 2)
+ if (current_count < 1 + !processor_pm_external())
status = -EFAULT;
end:
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