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authorJulien Grall <julien.grall@linaro.org>2013-09-09 15:35:26 +0400
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2013-09-09 15:35:26 +0400
commite1a9c16b303725ac900fee2a3ec4dbe2c2f846ab (patch)
tree500c930c40e836417a5e1d62cf00c730664bf104 /arch/arm
parentd7f8f48d1eb3186b1b80b2ed9a7adab191f753e9 (diff)
downloadlinux-e1a9c16b303725ac900fee2a3ec4dbe2c2f846ab.tar.xz
xen/arm: disable cpuidle and cpufreq when linux is running as dom0
When linux is running as dom0, Xen doesn't show the physical cpu but a virtual CPU. On some ARM SOC (for instance the exynos 5250), linux registers callbacks for cpuidle and cpufreq. When these callbacks are called, they will modify directly the physical cpu not the virtual one. It can impact the whole board instead of only dom0. Signed-off-by: Julien Grall <julien.grall@linaro.org> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/xen/enlighten.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index e70ce04e9dad..79b317a5e480 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -21,6 +21,8 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
+#include <linux/cpuidle.h>
+#include <linux/cpufreq.h>
#include <linux/mm.h>
@@ -266,6 +268,13 @@ static int __init xen_guest_init(void)
if (!xen_initial_domain())
xenbus_probe(NULL);
+ /*
+ * Making sure board specific code will not set up ops for
+ * cpu idle and cpu freq.
+ */
+ disable_cpuidle();
+ disable_cpufreq();
+
return 0;
}
core_initcall(xen_guest_init);