From 48cdd8287f47a3cdad5b9273a5ef81bf605f7826 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Tue, 13 Mar 2012 20:06:57 -0400
Subject: [PATCH] xen/cpufreq: Disable the cpu frequency scaling drivers from
 loading.

By using the functionality provided by "[CPUFREQ]: provide
disable_cpuidle() function to disable the API."

Under the Xen hypervisor we do not want the initial domain to exercise
the cpufreq scaling drivers. This is b/c the Xen hypervisor is
in charge of doing this as well and we can end up with both the
Linux kernel and the hypervisor trying to change the P-states
leading to weird performance issues.

Acked-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
[v2: Fix compile error spotted by Benjamin Schweikert <b.schweikert@googlemail.com>]
---
 arch/x86/xen/setup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 12366238d07d..1ba8dff26753 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -10,6 +10,7 @@
 #include <linux/pm.h>
 #include <linux/memblock.h>
 #include <linux/cpuidle.h>
+#include <linux/cpufreq.h>
 
 #include <asm/elf.h>
 #include <asm/vdso.h>
@@ -420,6 +421,7 @@ void __init xen_arch_setup(void)
 	boot_cpu_data.hlt_works_ok = 1;
 #endif
 	disable_cpuidle();
+	disable_cpufreq();
 	WARN_ON(set_pm_idle_to_default());
 	fiddle_vdso();
 }
-- 
2.20.1