Messages in this thread | | | Date | Wed, 23 Mar 2005 20:48:05 +1100 | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-07 | From | Herbert Xu <> |
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On Wed, Mar 23, 2005 at 08:40:58PM +1100, Herbert Xu wrote: > Paul E. McKenney <paulmck@us.ibm.com> wrote: > > > > +void rcu_read_unlock(void) > > +{ > > + int cpu; > > + > > + if (--current->rcu_read_lock_nesting == 0) { > > + atomic_dec(¤t->rcu_data->active_readers); > > + /* > > + * Check whether we have reached quiescent state. > > + * Note! This is only for the local CPU, not for > > + * current->rcu_data's CPU [which typically is the > > + * current CPU, but may also be another CPU]. > > + */ > > + cpu = get_cpu(); > > > > And need an smp_mb() here, again for non-x86 CPUs. > > The atomic_dec is already a barrier.
Sorry, I was confused. atomic_dec is not a barrier of course. -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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