This fourth set adds more infrastructure for Frederic's user-mode nohz
work, additional improvements to RCU_FAST_NO_HZ, and a few bug fixes.
The patches are as follows:
1,2. More support for user-mode nohz (courtesy of Frederic Weisbecker).
3. Ignore RCU callback batch limits if the CPU is otherwise idle.
This allows a CPU to more quickly clear a backlog of callbacks,
and thus more quickly enter dyntick-idle mode.
4. Adaptive dyntick-entry approach that more efficiently handles
the various possible grace-period begin/end scenarios.
5. Remove a redundant variable declaration.
6. Allow rcutorture to avoid attempting to offline unhotpluggable CPUs.
7. Fix RCU-lockdep splats involving RCU read-side critical sections
that partially overlap irq-disable code sections (courtesy of
For a testing-only version of this patchset from git, please see the
following subject-to-rebase branch, based on 3.2-rc3:
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