linux-kernel - Re: [PATCH v7 14/14] Documentation: remove the constraint on the distances of node pairs

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Date:   Tue, 30 Aug 2016 18:55:18 +0100
From:   Will Deacon <will.deacon@....com>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
        Tianhong Ding <dingtianhong@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v7 14/14] Documentation: remove the constraint on the
 distances of node pairs

On Sat, Aug 27, 2016 at 06:44:39PM +0800, Leizhen (ThunderTown) wrote:
> 
> 
> On 2016/8/26 23:35, Will Deacon wrote:
> > On Wed, Aug 24, 2016 at 03:44:53PM +0800, Zhen Lei wrote:
> >> Update documentation. This limit is unneccessary.
> >>
> >> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> >> Acked-by: Rob Herring <robh@...nel.org>
> >> ---
> >>  Documentation/devicetree/bindings/numa.txt | 1 -
> >>  1 file changed, 1 deletion(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt
> >> index 21b3505..c0ea4a7 100644
> >> --- a/Documentation/devicetree/bindings/numa.txt
> >> +++ b/Documentation/devicetree/bindings/numa.txt
> >> @@ -48,7 +48,6 @@ distance (memory latency) between all numa nodes.
> >>
> >>    Note:
> >>  	1. Each entry represents distance from first node to second node.
> >> -	The distances are equal in either direction.
> > 
> > Hmm, so what happens now if firmware provides a description where both
> > distances (in either direction) are supplied, but are different?
> I have not known any hardware that the distances of two direction are
> different yet

Then let's not add support for this just yet. When we have systems that
actually need it, we'll be in a much better position to assess the
suitability of any patches. At the moment, the whole thing is pretty
questionable and it adds needless complication to the code.

Will