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    SubjectRe: 2.6.28-rc2-mm1: possible circular locking
    On Wed, 29 Oct 2008 13:58:40 -0700
    Andrew Morton <akpm@linux-foundation.org> 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://www.lesswatts.org


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