From: Keir Fraser <keir.fraser@citrix.com>
Date: Sat, 24 May 2008 08:23:40 +0000 (+0100)
Subject: Cx fix - Add wrap-back calculation for 24b PM timer ticks.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14207^2~44
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=74c4a80c2b2c35d0112f07273761ba1d24d936a0;p=xen.git

Cx fix - Add wrap-back calculation for 24b PM timer ticks.

Signed-off-by: Wei Gang <gang.wei@intel.com>
---

diff --git a/xen/arch/x86/acpi/cpu_idle.c b/xen/arch/x86/acpi/cpu_idle.c
index 0d471d9a7d..bf81d63984 100644
--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -173,6 +173,8 @@ static inline u32 ticks_elapsed(u32 t1, u32 t2)
 {
     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);
 }