xen-devel

[Top] [All Lists]

[Xen-devel] [PATCH] linux-2.6.18/ACPI: allow passing down C1 information

from [Jan Beulich]

[Permanent Link][Original]

To:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] [PATCH] linux-2.6.18/ACPI: allow passing down C1 information if no other C-states exist
From:	"Jan Beulich" <JBeulich@xxxxxxxxxx>
Date:	Thu, 25 Aug 2011 13:53:19 +0100
Cc:	Kevin Tian <kevin.tian@xxxxxxxxx>
Delivery-date:	Thu, 25 Aug 2011 05:52:59 -0700
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx

Otherwise Xen may end up not using MWAIT despite its availability.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- 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:

xen-acpi-pass-C1.patch
Description: Text document

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

[More with this subject...]

<Prev in Thread]	Current Thread	[Next in Thread>
[Xen-devel] [PATCH] linux-2.6.18/ACPI: allow passing down C1 information if no other C-states exist, Jan Beulich <=

Previous by Date:	[Xen-devel] [PATCH] p2m: use defines for page sizes, Christoph Egger
Next by Date:	Re: [Xen-devel] Release candidates for Xen 4.1.2 and 4.0.3, Keir Fraser
Previous by Thread:	[Xen-devel] [PATCH] p2m: use defines for page sizes, Christoph Egger
Next by Thread:	[Xen-devel] [PATCH] fix gcc-4.6's set-but-not-used warnings, Jan Beulich
Indexes:	[Date] [Thread] [Top] [All Lists]