Messages in this thread | | | Date | Tue, 23 Jan 2007 16:38:26 -0800 | From | Andrew Morton <> | Subject | Re: [mm PATCH 4/6] RCU: preemptible RCU |
| |
On Tue, 16 Jan 2007 00:58:58 +0530 Dipankar Sarma <dipankar@in.ibm.com> wrote:
> +/* > + * Wait for CPUs to acknowledge the flip. > + */ > +static int rcu_try_flip_waitack(int flipctr) > +{ > + int cpu; > + > + for_each_possible_cpu(cpu) > + if (per_cpu(rcu_flip_flag, cpu) != RCU_FLIP_SEEN) > + return 1; > + > + /* > + * Make sure our checks above don't bleed into subsequent > + * waiting for the sum of the counters to reach zero. > + */ > + smp_mb(); > + return 0; > +}
Confused. If some of the possible cpus aren't online, doesn't the state machine get stuck?? - 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/
| |