Re: [Xen-devel] [PATCH 2/2] xen/x86: Call cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from xen_play_dead()

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Mar 17, 2016 at 09:03:25AM -0400, Boris Ostrovsky wrote:
> This call has always been missing from xen_play dead() but until
> recently this was rather benign. With new cpu hotplug framework
> however this call is required, otherwise a hot-plugged CPU will not

Could you include the commit id of the 'new cpu hotplug' in case
anybody wants to backport this?

Thanks!
> be properly brough up (by never calling cpuhp_online_idle())
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> ---
>  arch/x86/xen/smp.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
> index 3c6d17f..719cf29 100644
> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -545,6 +545,8 @@ static void xen_play_dead(void) /* used only with 
> HOTPLUG_CPU */
>        * data back is to call:
>        */
>       tick_nohz_idle_enter();
> +
> +     cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
>  }
>  
>  #else /* !CONFIG_HOTPLUG_CPU */
> -- 
> 1.7.1
> 

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