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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>
hifive-unleashed-5.1
Len Brown 2011-04-01 18:28:35 -04:00
parent 62027aea23
commit d91ee5863b
3 changed files with 8 additions and 1 deletions
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3
arch/x86/xen/setup.c
View File

@ -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();

4
drivers/cpuidle/cpuidle.c
View File

@ -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)

2
include/linux/cpuidle.h
View File

@ -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; }