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    Subject[PATCH rcu 6/8] rcu: The rcu_needs_cpu() function is not a quiescent state
    Date
    From: "Paul E. McKenney" <paul.mckenney@linaro.org>

    The TINY_PREEMPT_RCU() function rcu_preempt_needs_cpu(), which is called
    from rcu_needs_cpu(), assumes that it is in a quiescent state with respect
    to the CPU. This is no longer the case. This commit therefore updates
    rcu_preempt_needs_cpu() to make it aware that it is not running in a
    quiescent state.

    Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
    Tested-by: Pascal Chapperon <pascal.chapperon@wanadoo.fr>
    ---
    kernel/rcutiny_plugin.h | 2 --
    1 files changed, 0 insertions(+), 2 deletions(-)

    diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
    index fc31a2d..849ede5 100644
    --- a/kernel/rcutiny_plugin.h
    +++ b/kernel/rcutiny_plugin.h
    @@ -846,8 +846,6 @@ EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
    */
    int rcu_preempt_needs_cpu(void)
    {
    - if (!rcu_preempt_running_reader())
    - rcu_preempt_cpu_qs();
    return rcu_preempt_ctrlblk.rcb.rcucblist != NULL;
    }

    --
    1.7.8


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