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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 03/25/2016 10:53 AM, Konrad Rzeszutek Wilk wrote:
> 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?
Sure.

It's commit 8df3e07e7f21 ("cpu/hotplug: Let upcoming cpu bring itself 
fully up").
Do you (or David) want me to re-send it?

-boris



> 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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