linux-kernel - Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO

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Message-ID: <20191011111539.GX2311@hirez.programming.kicks-ass.net>
Date:   Fri, 11 Oct 2019 13:15:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Robin Murphy <robin.murphy@....com>, catalin.marinas@....com,
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Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

On Fri, Oct 11, 2019 at 11:27:54AM +0800, Yunsheng Lin wrote:
> But I failed to see why the above is related to making node_to_cpumask_map()
> NUMA_NO_NODE aware?

Your initial bug is for hns3, which is a PCI device, which really _MUST_
have a node assigned.

It not having one, is a straight up bug. We must not silently accept
NO_NODE there, ever.