On Wed, Oct 31, 2012 at 05:47:04PM +0000, Christoph Lameter wrote:
> On Wed, 31 Oct 2012, Shan Wei wrote:
>
> > 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..3a21fcf 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_ptr(rsp->rda)->mynode;
>
> Do
>
> rnp = this_cpu_read(rsp->rda->mynode);
>
> instad.
One thing to keep in mind -- the only purpose of this is to diffuse
memory contention. So there is no need to disable preemption.
Thanx, Paul
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