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SubjectRe: [Xen-devel] [PATCH 09/18] cpuidle: replace xen access to x86 pm_idle and default_idle
On Sat, Apr 02, 2011 at 02:22:51AM -0400, Len Brown wrote:
> 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.
Hey Len,

Looks good to me. I've also tested this on the affected Intel machine and
your patchset works fine.

>
> 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
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel


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