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    Subject[PATCH RFC tip/core/rcu 11/13] rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass
    Date
    From: Paul E. McKenney <paul.mckenney@linaro.org>

    Fixes and workarounds for a number of issues (for example, that in
    df4012edc) make it safe to once again detect dyntick-idle CPUs on the
    first pass of force_quiescent_state(), so this commit makes that change.

    Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    kernel/rcutree.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/kernel/rcutree.c b/kernel/rcutree.c
    index aab9ed5..69bb372 100644
    --- a/kernel/rcutree.c
    +++ b/kernel/rcutree.c
    @@ -607,7 +607,7 @@ int rcu_is_cpu_rrupt_from_idle(void)
    static int dyntick_save_progress_counter(struct rcu_data *rdp)
    {
    rdp->dynticks_snap = atomic_add_return(0, &rdp->dynticks->dynticks);
    - return 0;
    + return (rdp->dynticks_snap & 0x1) == 0;
    }

    /*
    --
    1.7.3.2


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