From: Keir Fraser <keir@xensource.com>
Date: Mon, 1 Oct 2007 08:32:25 +0000 (+0100)
Subject: x86: Fix time going backwards on CPU frequency change.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14929^2~23
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=f53d6f8b4d43f0313b06d780dae4124560a9fa63;p=xen.git

x86: Fix time going backwards on CPU frequency change.
Signed-off-by: Keir Fraser <keir@xensource.com>
---

diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 7b23426c6e..d0f45fb018 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -728,11 +728,11 @@ int cpu_frequency_change(u64 freq)
     u64 curr_tsc;
 
     local_irq_disable();
-    set_time_scale(&t->tsc_scale, freq);
     rdtscll(curr_tsc);
     t->local_tsc_stamp = curr_tsc;
     t->stime_local_stamp = get_s_time();
     t->stime_master_stamp = read_platform_stime();
+    set_time_scale(&t->tsc_scale, freq);
     local_irq_enable();
 
     /* A full epoch should pass before we check for deviation. */