> -----Original Message-----
> From: Stefano Stabellini <sstabell...@kernel.org>
> Sent: 2021年9月24日 10:34
> To: Wei Chen <wei.c...@arm.com>
> Cc: xen-devel@lists.xenproject.org; sstabell...@kernel.org; jul...@xen.org;
> Bertrand Marquis <bertrand.marq...@arm.com>
> Subject: Re: [PATCH 28/37] xen/arm: stub memory hotplug access helpers for
> Arm
>
> On Thu, 23 Sep 2021, Wei Chen wrote:
> > Common code in NUMA need these two helpers to access/update
> > memory hotplug end address. Arm has not support memory hotplug
> > yet. So we stub these two helpers in this patch to make NUMA
> > common code happy.
> >
> > Signed-off-by: Wei Chen <wei.c...@arm.com>
> > ---
> > xen/include/asm-arm/mm.h | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
> > index 7b5e7b7f69..fc9433165d 100644
> > --- a/xen/include/asm-arm/mm.h
> > +++ b/xen/include/asm-arm/mm.h
> > @@ -362,6 +362,16 @@ void clear_and_clean_page(struct page_info *page);
> >
> > unsigned int arch_get_dma_bitsize(void);
> >
> > +static inline void mem_hotplug_update_boundary(paddr_t end)
> > +{
> > +
> > +}
> > +
> > +static inline paddr_t mem_hotplug_boundary(void)
> > +{
> > + return 0;
> > +}
>
> Why zero? Could it be INVALID_PADDR ?
Yes, INVALID_PADDR is better.
