Re: [Xen-devel] [PATCH] xen: arm: ignore CPUs which are not marked available in the DT

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-07-23 at 18:15 +0100, Julien Grall wrote:
> Hi Ian,
> 
> On 07/23/2014 05:45 PM, Ian Campbell wrote:
> > Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > ---
> >  xen/arch/arm/smpboot.c |    3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
> > index cf149da..4b0a738 100644
> > --- a/xen/arch/arm/smpboot.c
> > +++ b/xen/arch/arm/smpboot.c
> > @@ -134,6 +134,9 @@ void __init smp_init_cpus(void)
> >          if ( !dt_device_type_is_equal(cpu, "cpu") )
> >              continue;
> >  
> > +        if ( !dt_device_is_available(cpu) )
> > +            continue;
> > +
> 
> I can't find a such things on the Linux device tree bindings.

status is a generic property which is common to all nodes, it comes from
ePAPR.

>  Do you
> have a use case where CPU are marked disabled?

I use it locally when booting with models -- it allows me to turn off
cpus in the base .dts file using a wrapper instead of having to edit the
original.

Ian.


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