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    SubjectRe: mm: deadlock between get_online_cpus/pcpu_alloc
    On Wed, 8 Feb 2017, Michal Hocko wrote:

    > > Huch? stop_machine() is horrible and heavy weight. Don't go there, there
    > > must be simpler solutions than that.
    >
    > Absolutely agreed. We are in the page allocator path so using the
    > stop_machine* is just ridiculous. And, in fact, there is a much simpler
    > solution [1]

    That is nonsense. stop_machine would be used when adding removing a
    processor. There would be no need to synchronize when looping over active
    cpus anymore. get_online_cpus() etc would be removed from the hot
    path since the cpu masks are guaranteed to be stable.

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