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Subject[PATCH 09/18] cpuidle: replace xen access to x86 pm_idle and default_idle
Date
From: Len Brown <len.brown@intel.com>

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
Signed-off-by: Len Brown <len.brown@intel.com>
---
arch/x86/xen/setup.c | 3 ++-
drivers/cpuidle/cpuidle.c | 4 ++++
include/linux/cpuidle.h | 2 ++
3 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a8a66a5..aa02cce 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>
@@ -354,7 +355,7 @@ 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 faae2c3..041df0b 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 36719ea..b89f67d 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; }
--
1.7.5.rc0


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