[Xen-changelog] [linux-2.6.18-xen] xen/ACPI: allow passing down C1 information if no other C-states exist

[Xen patchbot-linux-2.6.18-xen <patchbot@xxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1314443558 -3600
# Node ID 700f70b60d4b50e04228e54bf636ec882bf54968
# Parent  0b8a9b22b70a2a69f829182368ec4590d5e93792
xen/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@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 0b8a9b22b70a -r 700f70b60d4b drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c     Fri Aug 19 09:53:47 2011 +0100
+++ b/drivers/acpi/processor_idle.c     Sat Aug 27 12:12:38 2011 +0100
@@ -780,7 +780,7 @@
                          current_count));
 
        /* Validate number of power states discovered */
-       if (current_count < 2)
+       if (current_count < (processor_pm_external() ? 1 : 2))
                status = -EFAULT;
 
       end:

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