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Date:   Fri, 31 Aug 2018 13:26:39 +0200
From:   Peter Zijlstra <>
To:     Srikar Dronamraju <>
Cc:     Ingo Molnar <>,
        LKML <>,
        Mel Gorman <>,
        Rik van Riel <>,
        Thomas Gleixner <>,
        Michael Ellerman <>,
        Heiko Carstens <>,
        Suravee Suthikulpanit <>,
        linuxppc-dev <>,
        Benjamin Herrenschmidt <>
Subject: Re: [PATCH 2/2] sched/topology: Expose numa_mask set/clear functions
 to arch

On Fri, Aug 31, 2018 at 01:12:53PM +0200, Peter Zijlstra wrote:
> NAK, not until you've fixed every cpu_to_node() user in the kernel to
> deal with that mask changing.

Also, what happens if userspace reads that information; uses libnuma and
then you go and shift the world underneath their feet?

> This is absolutely insane.

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