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authorLen Brown <len.brown@intel.com>2011-04-01 18:28:35 -0400
committerLen Brown <len.brown@intel.com>2011-08-03 19:06:36 -0400
commitd91ee5863b71e8c90eaf6035bff3078a85e2e7b5 (patch)
tree7c4972d8d6f614f656720ec686a6288de68f4af3
parent62027aea23fcd14478abdddd3b74a4e0f5fb2984 (diff)
downloadlinux-linaro-stable-d91ee5863b71e8c90eaf6035bff3078a85e2e7b5.tar.gz
cpuidle: replace xen access to x86 pm_idle and default_idle
When a Xen Dom0 kernel boots on a hypervisor, it gets access to the raw-hardware ACPI tables. While it parses the idle tables for the hypervisor's beneift, it uses HLT for its own idle. Rather than have xen scribble on pm_idle and access default_idle, have it simply disable_cpuidle() so acpi_idle will not load and architecture default HLT will be used. cc: xen-devel@lists.xensource.com Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
-rw-r--r--arch/x86/xen/setup.c3
-rw-r--r--drivers/cpuidle/cpuidle.c4
-rw-r--r--include/linux/cpuidle.h2
3 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 60aeeb56948f..a9627e2e3295 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -9,6 +9,7 @@
#include <linux/mm.h>
#include <linux/pm.h>
#include <linux/memblock.h>
+#include <linux/cpuidle.h>
#include <asm/elf.h>
#include <asm/vdso.h>
@@ -426,7 +427,7 @@ void __init xen_arch_setup(void)
#ifdef CONFIG_X86_32
boot_cpu_data.hlt_works_ok = 1;
#endif
- pm_idle = default_idle;
+ disable_cpuidle();
boot_option_idle_override = IDLE_HALT;
fiddle_vdso();
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index faae2c357bab..041df0b056b2 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -34,6 +34,10 @@ int cpuidle_disabled(void)
{
return off;
}
+void disable_cpuidle(void)
+{
+ off = 1;
+}
#if defined(CONFIG_ARCH_HAS_CPU_IDLE_WAIT)
static void cpuidle_kick_cpus(void)
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 36719ead50e8..b89f67da919e 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -122,6 +122,7 @@ struct cpuidle_driver {
};
#ifdef CONFIG_CPU_IDLE
+extern void disable_cpuidle(void);
extern int cpuidle_register_driver(struct cpuidle_driver *drv);
struct cpuidle_driver *cpuidle_get_driver(void);
@@ -135,6 +136,7 @@ extern int cpuidle_enable_device(struct cpuidle_device *dev);
extern void cpuidle_disable_device(struct cpuidle_device *dev);
#else
+static inline void disable_cpuidle(void) { }
static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
{return -ENODEV; }