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    SubjectRe: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast() implementation
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    On Mon, 2010-04-12 at 20:43 -0700, Paul E. McKenney wrote:
    > > So we might have to support the interrupt assumption, at least in some
    > > form, with those guys...
    >
    > One way to make the interrupt assumption official is to use
    > synchronize_sched() rather than synchronize_rcu().

    Well, call_rcu_sched() then, because the current usage is to use
    call_rcu() to free the page directories.

    Paul, here is a call_rcu_sched() available in kernel/rcutree.c, but am I
    right in reading that code that that would not be available for
    preemptible RCU?




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