linux-kernel - Re: [PATCH x86/mm UPDATED] x86-64, NUMA: Fix distance table handling

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Message-ID: <4D7A6DC2.9060601@kernel.org>
Date:	Fri, 11 Mar 2011 10:45:22 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	David Rientjes <rientjes@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH x86/mm UPDATED] x86-64, NUMA: Fix distance table handling

On 03/11/2011 10:29 AM, Tejun Heo wrote:
> On Fri, Mar 11, 2011 at 10:25:23AM -0800, Yinghai Lu wrote:
>> now even emulation have that distance array.
>>
>> why keep it simple to make all path have that array?
> 
> Okay, I don't know, maybe, but I don't think it's gonna buy much.  We
> need boundary check in the distance testing function anyway in case
> someone calls in with out-of-bound nid's and not having distance table
> is just a degenerate case of the generic sanity check, so there really
> isn't much to be gained by allocating dummy table.

for out-of-bound nid access, looks like should generate BUG_ON for it ?
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