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    SubjectRe: 2.6.28-rc2-mm1: possible circular locking
    On Wed, 29 Oct 2008 13:58:40 -0700
    Andrew Morton <> wrote:

    > We've been calling schedule_on_each_cpu() from within
    > lru_add_drain_all() for ages. What changed to cause all this
    > to start happening?

    what started to get these out of the weed is that copy_*_user() is now
    annotated to (potentially) take the mmap sem (which it does if there's
    a fault)...
    previously you had to actually fault to get the lock dependency noticed.

    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit atty://

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