[PATCH] powerpc/pseries: Disable VPNH feature
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2011-03-09 23:00:33
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> --- Jesse: I'm sending that to Linus now. We'll sort things out for the next release.
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index fd48123..74f1baa 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c@@ -1516,6 +1516,7 @@ int start_topology_update(void) { int rc = 0; +#if 0 /* Disabled until races with load balancing are fixed */ if (firmware_has_feature(FW_FEATURE_VPHN) && get_lppaca()->shared_proc) { vphn_enabled = 1;
@@ -1524,6 +1525,7 @@ int start_topology_update(void) set_topology_timer(); rc = 1; } +#endif return rc; }