[Xen-changelog] [linux-2.6.18-xen] ACPI: Backport missing part for T-State MSR support

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1235991239 0
# Node ID b02a90bf5bbc5bf62238bee7e2f440d87b7d8a17
# Parent  2f1b770d84e54f76185181b0cc74337bf79a2a83
ACPI: Backport missing part for T-State MSR support

Part of below kernel commit was missed while packporting T-State
support.

commit f79f06ab9f86d7203006d2ec8992ac80df36a34e
Author: Zhao Yakui <yakui.zhao@xxxxxxxxx>
Date:   Thu Nov 15 17:06:36 2007 +0800

    ACPI: Enable MSR (FixedHW) support for T-States

    Add throttling control via MSR when T-states uses
    the FixHW Control Status registers.

    Signed-off-by: Zhao Yakui <yakui.zhao@xxxxxxxxx>
    Signed-off-by: Li Shaohua <shaohua.li@xxxxxxxxx>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
---
 arch/i386/kernel/acpi/processor.c |    3 +++
 1 files changed, 3 insertions(+)

diff -r 2f1b770d84e5 -r b02a90bf5bbc arch/i386/kernel/acpi/processor.c
--- a/arch/i386/kernel/acpi/processor.c Tue Feb 17 11:31:13 2009 +0000
+++ b/arch/i386/kernel/acpi/processor.c Mon Mar 02 10:53:59 2009 +0000
@@ -49,6 +49,9 @@ static void init_intel_pdc(struct acpi_p
        if (cpu_has(c, X86_FEATURE_EST))
                buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
 
+       if (cpu_has(c, X86_FEATURE_ACPI))
+               buf[2] |= ACPI_PDC_T_FFH;
+
        obj->type = ACPI_TYPE_BUFFER;
        obj->buffer.length = 12;
        obj->buffer.pointer = (u8 *) buf;

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