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    SubjectRe: [patch] RCU: introduce rcu_soon_pending() interface
    On Tue, Apr 25, 2006 at 01:33:37PM +0200, Martin Schwidefsky wrote:
    > On Tue, 2006-04-25 at 04:23 -0700, Paul E. McKenney wrote:
    > > > Neither rcu_pending() nor rcu_soon_pending() are commented or documented.
    > > > Pity the poor user trying to work out what they do, and how they differ.
    > > > They're global symbols and they form part of the RCU API - they should be
    > > > kernel docified, please.
    > >
    > > Please note that the rcu_pending() interface was never intended for
    > > external use -- it is purely internal to the RCU infrastructure.
    > > If there is a new external use for rcu_pending(), then it would need to
    > > be documented. But I would rather this one stay internal -- different
    > > RCU implementations might need different things.
    > >
    > > So, what are we trying to do here?
    > We are trying to find out if an idle cpu needs to continue to tick every
    > HZ or if we can put it into deep sleep. If there is any kind of rcu work
    > pending that requires the idle cpu to call in later via a timer
    > interrupt, we need to know.

    OK, this confirms my guess that you are acting as part of the RCU
    implementation rather than as a normal user of the RCU API.

    Thanx, Paul
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