On Sat, Nov 03, 2012 at 12:01:47AM +0800, Shan Wei wrote:
> From: Shan Wei <davids...@tencent.com>
> 
> Signed-off-by: Shan Wei <davids...@tencent.com>
> ---
>  kernel/rcutree.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index 74df86b..441b945 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1960,7 +1960,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
>       struct rcu_node *rnp_old = NULL;
> 
>       /* Funnel through hierarchy to reduce memory contention. */
> -     rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
> +     rnp = __this_cpu_read(rsp->rda->mynode);

OK, I'll bite...  Why this instead of:

        rnp = __this_cpu_read(rsp->rda)->mynode;

                                                        Thanx, Paul

>       for (; rnp != NULL; rnp = rnp->parent) {
>               ret = (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) ||
>                     !raw_spin_trylock(&rnp->fqslock);
> -- 
> 1.7.1
> 
> 
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