From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Tue, 4 Mar 2014 09:55:56 +0000 (+0100)
Subject: x86/time: avoid redundant this_cpu()
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~5529
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22man:///%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22man:/?a=commitdiff_plain;h=58bebfdb790c5639d28d5e1b5fd49a3352c5fc25;p=xen.git

x86/time: avoid redundant this_cpu()

this_cpu() makes use of RELOC_HIDE() to prevent unsafe optimisations, forcing
a recalculation of the per-cpu data area.  Don't use it needlessly.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index b2c8dc7359..000191b945 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -1323,7 +1323,7 @@ void init_percpu_time(void)
     s_time_t now;
 
     /* Initial estimate for TSC rate. */
-    this_cpu(cpu_time).tsc_scale = per_cpu(cpu_time, 0).tsc_scale;
+    t->tsc_scale = per_cpu(cpu_time, 0).tsc_scale;
 
     local_irq_save(flags);
     rdtscll(t->local_tsc_stamp);