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

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Message-ID: <20190925104040.GD4553@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Sep 2019 12:40:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Yunsheng Lin <linyunsheng@...wei.com>, catalin.marinas@....com,
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Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

On Tue, Sep 24, 2019 at 03:19:39PM +0200, Michal Hocko wrote:

> > The below would get rid of the PMU and workqueue warnings with no
> > side-effects (the device isn't used for anything except sysfs).
> 
> Hardcoding to 0 is simply wrong, if the node0 is cpuless for example...

It doesn't matter.... that 0 is _never_ used. These are fake devices,
and all we care about is getting rid of that error.

If it makes you feel better we can make it -2 and have dev_to_node()
WARN if it ever sees one.