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    SubjectRe: [PATCH 3/3] s390/mm: fix mis-accounting of pgtable_bytes
    On Wed, Oct 31, 2018 at 07:31:49AM +0100, Martin Schwidefsky wrote:
    > Thanks for testing. Unfortunately Heiko reported another issue yesterday
    > with the patch applied. This time the other way around:
    >
    > BUG: non-zero pgtables_bytes on freeing mm: -16384
    >
    > I am trying to understand how this can happen. For now I would like to
    > keep the patch on hold in case they need another change.

    FWIW, Kirill: is there a reason why this "BUG:" output is done with
    pr_alert() and not with VM_BUG_ON() or one of the WARN*() variants?

    That would to get more information with DEBUG_VM and / or
    panic_on_warn=1 set. At least for automated testing it would be nice
    to have such triggers.

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