linux-kernel - Re: [tip:x86/numa] x86: Unify cpu/apicid <-> NUMA node mapping between 32 and 64bit

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Message-ID: <AANLkTikfLF55g2MoicWvsOnStT98q2bj5M+LnwiyPhti@mail.gmail.com>
Date:	Mon, 31 Jan 2011 11:55:22 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	penberg@...nel.org, tglx@...utronix.de, rientjes@...gle.com,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/numa] x86: Unify cpu/apicid <-> NUMA node mapping
 between 32 and 64bit

On Mon, Jan 31, 2011 at 7:53 AM, Tejun Heo <tj@...nel.org> wrote:
> Hello, Yinghai.
>
> On Fri, Jan 28, 2011 at 12:33:00PM -0800, Yinghai Lu wrote:
>> > +#ifdef CONFIG_NUMA
>> > +extern int __cpuinit numa_cpu_node(int apicid);
>>
>> cpu or apicid?
>
> Should have been @cpu.  Will send a patch to update it.
>
>> > +int __cpuinit numa_cpu_node(int cpu)
>> > +{
>> > +   int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
>> > +
>> > +   if (apicid != BAD_APICID)
>> > +           return __apicid_to_node[apicid];
>> > +   return NUMA_NO_NODE;
>> > +}
>>
>> it should be changed to cpu_to_node_via_apicid(), it could return
>> not onlined node, aka node without memory.
>>
>> So don't mess it up with cpu_to_node()
>
> Hmmm... are you saying that the name is too confusing with
> cpu_to_node() and should be renamed to cpu_to_node_via_apicid()?  In
> that case, I agree but wish the name were something which represents
> what it does as _via_apicid postfix doesn't really tell much.  Any
> better idea?

yes.

wonder if there is other good name better than cpu_to_node_via_apicid...

Yinghai
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