You are correct.  I found a problem with multiple cores last week,
and I have a new patch in testing.  I will resubmit it after more
testing.

Sorry for the inconvenience.

Michael

On 01/27/2018 03:52 AM, Michael Ellerman wrote:

Michael Bringmann [off-list ref] writes:

quoted

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index b15bae2..0a49231 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c

@@ -303,6 +306,71 @@ static void __init check_cpu_feature_properties(unsigned long node)
 	}
 }
 
+static void __init early_init_setup_thread_group_mask(unsigned long node,
+						cpumask_t *thread_group_mask)
+{
+	const __be32 *thrgrp;
+	int len, rc = 0;
+	u32 cc_type = 0, no_split = 0, thr_per_split = 0;
+	int j, k;
+
+	cpumask_clear(thread_group_mask);
+
+	thrgrp = of_get_flat_dt_prop(node, "ibm,thread-groups", &len);
+	if (!thrgrp)
+		return;

This breaks booting on all my systems.

cheers

-- 
Michael W. Bringmann
Linux Technology Center
IBM Corporation
Tie-Line  363-5196
External: (512) 286-5196
Cell:       (512) 466-0650
mwb@linux.vnet.ibm.com