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xen/arm: disable cpuidle and cpufreq when linux is running as dom0

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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>
This commit is contained in:
Julien Grall 2013-09-09 11:35:26 +00:00 committed by Stefano Stabellini
parent d7f8f48d1e
commit e1a9c16b30
1 changed files with 9 additions and 0 deletions
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9
arch/arm/xen/enlighten.c
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@ -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);