----- Original Message -----
> From: "Raghavendra K T" <raghavendra...@linux.vnet.ibm.com>
> To: mi...@redhat.com, pet...@infradead.org, b...@kernel.crashing.org,
> pau...@samba.org, m...@ellerman.id.au,
> an...@samba.org, a...@linux-foundation.org
> Cc: jstan...@redhat.com, gk...@linux.vnet.ibm.com, "grant likely"
> <grant.lik...@linaro.org>,
> nik...@linux.vnet.ibm.com, vdavy...@parallels.com, "raghavendra kt"
> <raghavendra...@linux.vnet.ibm.com>,
> linuxppc-dev@lists.ozlabs.org, linux-ker...@vger.kernel.org,
> linux...@kvack.org
> Sent: Friday, 15 January, 2016 8:01:23 PM
> Subject: [PATCH] Fix: PowerNV crash with 4.4.0-rc8 at sched_init_numa
>
> Commit c118baf80256 ("arch/powerpc/mm/numa.c: do not allocate bootmem
> memory for non existing nodes") avoided bootmem memory allocation for
> non existent nodes.
>
> When DEBUG_PER_CPU_MAPS enabled, powerNV system failed to boot because
> in sched_init_numa, cpumask_or operation was done on unallocated nodes.
> Fix that by making cpumask_or operation only on existing nodes.
>
> [ Tested with and w/o DEBUG_PER_CPU_MAPS on x86 and powerpc ]
>
> Reported-by: Jan Stancek <jstan...@redhat.com>
Tested-by: Jan Stancek <jstan...@redhat.com>
I also verified with my setup, that this made the crash go away.
Report mail thread for reference:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-January/137691.html
Regards,
Jan
> Signed-off-by: Raghavendra K T <raghavendra...@linux.vnet.ibm.com>
> ---
> kernel/sched/core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 44253ad..474658b 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -6840,7 +6840,7 @@ static void sched_init_numa(void)
>
> sched_domains_numa_masks[i][j] = mask;
>
> - for (k = 0; k < nr_node_ids; k++) {
> + for_each_node(k) {
> if (node_distance(j, k) >
> sched_domains_numa_distance[i])
> continue;
>
> --
> 1.7.11.7
>
>
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