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    SubjectRe: [RFC PATCH 6/9] mm: export-GPL get_pageblock_migratetype
    On Thu, Apr 09, 2020 at 03:35:40PM -0400, Mathieu Desnoyers wrote:
    > The macro include/linux/mmzone.h:get_pageblock_migratetype() uses
    > the symbol get_pfnblock_flags_mask, which is not exported. That macro is
    > used within the kmem and page_ref trace events to trace the migrate type
    > of the target page.
    >
    > Exporting this symbol to GPL modules allows GPL kernel tracers to be
    > implemented as modules.

    Which might make some sense if we had such intree modules (and then even
    some as we could have higher level functions). Without that is
    obviously is a no-go.

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