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    Subject[PATCH tip/core/rcu 0/12] NO_HZ fixes for v5.5
    Hello!

    This series contains various fixes for NO_HZ and NO_HZ_FULL problems,
    including re-enabling the tick during long-term kernel-mode execution.

    1. Add TICK_DEP_BIT_RCU (which allows RCU-specific tick re-enabling),
    courtesy of Frederic Weisbecker.

    2. Export tick start/stop functions for rcutorture.

    3. Force on tick when invoking lots of callbacks.

    4. Force on tick for rcutorture readers and callback flooders.

    5. Provide RCU quiescent state in multi_cpu_stop().

    6. Make CPU-hotplug removal operations enable tick.

    7. Use {READ,WRITE)_ONCE() for multi_cpu_stop() ->state.

    8. Force tick on for nohz_full CPUs not reaching quiescent states.

    9. Force nohz_full tick on upon irq enter instead of exit.

    10. Reset CPU hints when reporting a quiescent state, courtesy of
    Joel Fernandes.

    11. Confine ->core_needs_qs accesses to the corresponding CPU.

    12. Make kernel-mode nohz_full CPUs invoke the RCU core processing.

    Thanx, Paul

    ------------------------------------------------------------------------

    include/linux/rcutree.h | 1
    include/linux/tick.h | 7 ++
    include/trace/events/timer.h | 3 -
    kernel/rcu/rcutorture.c | 20 +++++---
    kernel/rcu/tree.c | 105 ++++++++++++++++++++++++++++++-------------
    kernel/rcu/tree.h | 1
    kernel/stop_machine.c | 7 +-
    kernel/time/tick-sched.c | 11 ++++
    8 files changed, 114 insertions(+), 41 deletions(-)

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