powerpc/pseries: Disable VPNH feature

This feature triggers nasty races in the scheduler between the
rebuilding of the topology and the load balancing code, causing
the machine to hang.

Disable it for now until the races are fixed.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index fd4812329570d1658640c22776755dda9c1170fe..0dc95c0aa3beb01f9f46b2ebecaa551baa844e6f 100644 (file)
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1516,7 +1516,8 @@ int start_topology_update(void)
 {
        int rc = 0;
 
-       if (firmware_has_feature(FW_FEATURE_VPHN) &&
+       /* Disabled until races with load balancing are fixed */
+       if (0 && firmware_has_feature(FW_FEATURE_VPHN) &&
            get_lppaca()->shared_proc) {
                vphn_enabled = 1;
                setup_cpu_associativity_change_counters();