Re: [tip:sched/core] sched/numa: Rewrite the CONFIG_NUMA sched domain support

[Yinghai Lu]

On Mon, May 28, 2012 at 5:32 PM, Jiang Liu <liuj97@xxxxxxxxx> wrote:
> Hi Yinghai,
>        Does this patch fix your issue? https://lkml.org/lkml/2012/5/9/183.
> I have encountered a similar issue on an IA64 platform and the patch above
> works around it. But the root cause is a BIOS bug that the order of CPUs
> in MADT table doesn't conform to the ACPI specification and the first CPU
> in MADT is not the BSP, which breaks some assumption of the booting code
> and causes the core dump.

yes, with another patch from PeterZ.

---
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6396,8 +6396,7 @@ static void sched_init_numa(void)
                       sched_domains_numa_masks[i][j] = mask;

                       for (k = 0; k < nr_node_ids; k++) {
-                               if (node_distance(cpu_to_node(j), k) >
-                                               sched_domains_numa_distance[i])
+                               if (node_distance(j, k) >
sched_domains_numa_distance[i])
                                       continue;

                               cpumask_or(mask, mask, cpumask_of_node(k));
--
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