On Sun, 5 Feb 2006, Linux Kernel Mailing List wrote:
> [PATCH] percpu data: only iterate over possible CPUs
This sched.c bit breaks Xen, and probably also other architectures
that have CPU hotplug. I suspect the reason is that during early
bootup only the boot CPU is online, so nothing initialises the
runqueues for CPUs that are brought up afterwards.
I suspect we can get rid of this problem quite easily by moving
runqueue initialisation to init_idle()...
> diff --git a/kernel/sched.c b/kernel/sched.c
> index f77f23f..839466f 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -6109,7 +6109,7 @@ void __init sched_init(void)
> runqueue_t *rq;
> int i, j, k;
>
> - for (i = 0; i < NR_CPUS; i++) {
> + for_each_cpu(i) {
> prio_array_t *array;
>
> rq = cpu_rq(i);
--
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