[Xen-changelog] [xen-unstable] Cx fix - Add wrap-back calculation for 24b PM timer ticks.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1211617420 -3600
# Node ID c4506386b299b481c6576676aac32c197b997d33
# Parent  6c4cab061af414160b3fdafc7ca8855e3dc44af1
Cx fix - Add wrap-back calculation for 24b PM timer ticks.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
---
 xen/arch/x86/acpi/cpu_idle.c |    2 ++
 1 files changed, 2 insertions(+)

diff -r 6c4cab061af4 -r c4506386b299 xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c      Sat May 24 09:27:03 2008 +0100
+++ b/xen/arch/x86/acpi/cpu_idle.c      Sat May 24 09:23:40 2008 +0100
@@ -173,6 +173,8 @@ static inline u32 ticks_elapsed(u32 t1, 
 {
     if ( t2 >= t1 )
         return (t2 - t1);
+    else if ( !(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) )
+        return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
     else
         return ((0xFFFFFFFF - t1) + t2);
 }

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