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Date:   Wed, 31 Jul 2019 20:15:11 +0300
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Michal Hocko <mhocko@kernel.org>
Cc:     Hoan Tran OS <hoan@os.amperecomputing.com>,
        Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        "open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
        Paul Mackerras <paulus@samba.org>,
        "H . Peter Anvin" <hpa@zytor.com>,
        "sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
        Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        "linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        "x86@kernel.org" <x86@kernel.org>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Ingo Molnar <mingo@redhat.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Open Source Submission <patches@amperecomputing.com>,
        Pavel Tatashin <pavel.tatashin@microsoft.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Will Deacon <will.deacon@arm.com>,
        Borislav Petkov <bp@alien8.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        "linux-arm-kernel@lists.infradead.org" 
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        "David S . Miller" <davem@davemloft.net>,
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Subject: Re: microblaze HAVE_MEMBLOCK_NODE_MAP dependency (was Re: [PATCH v2
 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA)
References: <730368c5-1711-89ae-e3ef-65418b17ddc9@os.amperecomputing.com>
 <20190730081415.GN9330@dhcp22.suse.cz>
 <20190731062420.GC21422@rapoport-lnx>
 <20190731080309.GZ9330@dhcp22.suse.cz>
 <20190731111422.GA14538@rapoport-lnx>
 <20190731114016.GI9330@dhcp22.suse.cz>
 <20190731122631.GB14538@rapoport-lnx>
 <20190731130037.GN9330@dhcp22.suse.cz>
 <20190731142129.GA24998@rapoport-lnx>
 <20190731144114.GY9330@dhcp22.suse.cz>
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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.