microblaze HAVE_MEMBLOCK_NODE_MAP dependency (was Re: [PATCH v2 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA)

[Mike Rapoport]

On Wed, Jul 31, 2019 at 04:41:14PM +0200, Michal Hocko wrote:
> On Wed 31-07-19 17:21:29, Mike Rapoport wrote:
> > On Wed, Jul 31, 2019 at 03:00:37PM +0200, Michal Hocko wrote:
> > > 
> > > I am sorry, but I still do not follow. Who is consuming that node id
> > > information when NUMA=n. In other words why cannot we simply do
> >  
> > We can, I think nobody cared to change it.
> 
> It would be great if somebody with the actual HW could try it out.
> I can throw a patch but I do not even have a cross compiler in my
> toolbox.

Well, it compiles :)
 
> > > diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
> > > index a015a951c8b7..3a47e8db8d1c 100644
> > > --- a/arch/microblaze/mm/init.c
> > > +++ b/arch/microblaze/mm/init.c
> > > @@ -175,14 +175,9 @@ void __init setup_memory(void)
> > >  
> > >  		start_pfn = memblock_region_memory_base_pfn(reg);
> > >  		end_pfn = memblock_region_memory_end_pfn(reg);
> > > -		memblock_set_node(start_pfn << PAGE_SHIFT,
> > > -				  (end_pfn - start_pfn) << PAGE_SHIFT,
> > > -				  &memblock.memory, 0);
> > > +		memory_present(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
> > 
> > memory_present() expects pfns, the shift is not needed.
> 
> Right.
> 
> -- 
> Michal Hocko
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.