From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Wed, 9 Mar 2011 13:00:14 +0000 (+0000)
Subject: powerpc/pseries: Disable VPNH feature
X-Git-Tag: v2.6.38~30^2
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=36e8695ca5dcf48c837a6efe6f780c47ac9ec808;p=~emulex%2Finfiniband.git

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 fd481232957..0dc95c0aa3b 100644
--- 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();