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

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Message-ID: <20190925163154.GF4553@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Sep 2019 18:31:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Yunsheng Lin <linyunsheng@...wei.com>, catalin.marinas@....com,
        will@...nel.org, mingo@...hat.com, bp@...en8.de, rth@...ddle.net,
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Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

On Wed, Sep 25, 2019 at 03:25:44PM +0200, Michal Hocko wrote:
> I am sorry but I still do not understand why you consider this whack a
> mole better then simply live with the fact that NUMA_NO_NODE is a
> reality and that using the full cpu mask is a reasonable answer to that.

Because it doesn't make physical sense. A device _cannot_ be local to
all CPUs in a NUMA system.