x86, UV: Initialize BAU MMRs only on hubs with cpus

[karo-tx-linux.git] / arch / x86 / kernel / tlb_uv.c

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index abf3c31f14cf0eb3dba1deb181899d1d41de22c1..59efb5390b37bec6d0de735c93483c35ba0ca43a 100644 (file)
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -1635,12 +1635,16 @@ static int __init uv_bau_init(void)
        alloc_intr_gate(vector, uv_bau_message_intr1);
 
        for_each_possible_blade(uvhub) {
-               pnode = uv_blade_to_pnode(uvhub);
-               /* INIT the bau */
-               uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_ACTIVATION_CONTROL,
-                                     ((unsigned long)1 << 63));
-               mmr = 1; /* should be 1 to broadcast to both sockets */
-               uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, mmr);
+               if (uv_blade_nr_possible_cpus(uvhub)) {
+                       pnode = uv_blade_to_pnode(uvhub);
+                       /* INIT the bau */
+                       uv_write_global_mmr64(pnode,
+                                       UVH_LB_BAU_SB_ACTIVATION_CONTROL,
+                                       ((unsigned long)1 << 63));
+                       mmr = 1; /* should be 1 to broadcast to both sockets */
+                       uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST,
+                                               mmr);
+               }
        }
 
        return 0;