linux-kernel - Re: [PATCH 2/2] mm: vmemmap: arm64: add vmemmap

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Date:	Tue, 09 Apr 2013 10:07:11 +0800
From:	Lin Feng <linfeng@...fujitsu.com>
To:	Will Deacon <will.deacon@....com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"cl@...ux.com" <cl@...ux.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"arnd@...db.de" <arnd@...db.de>,
	"tony@...mide.com" <tony@...mide.com>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"isimatu.yasuaki@...fujitsu.com" <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [PATCH 2/2] mm: vmemmap: arm64: add vmemmap_verify check for
 hot-add node case

Hi will,

On 04/08/2013 06:55 PM, Will Deacon wrote:
> Given that we don't have NUMA support or memory-hotplug on arm64 yet, I'm
> not sure that this change makes much sense at the moment. early_pfn_to_nid
> will always return 0 and we only ever have one node.
> 
> To be honest, I'm not sure what that vmemmap_verify check is trying to
> achieve anyway. ia64 does some funky node affinity initialisation early on
> but, for the rest of us, it looks like we always just check the distance
> from node 0.

Sorry for my noise to arm people.

Yes, not everyone cares about vmemmap_verify(), as you described it's not
necessary to arm64 at all. 

thanks,
linfeng
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