diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index 42d412fd8b02cdd369b5cc8db5a67aa5cc7a0770..ce1d54c8a433a6b866977beeb9c6681e0db64746 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -26,20 +26,22 @@
  * BAU_SB_DESCRIPTOR_BASE register, set 1 is located at BASE + 512,
  * set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on.
  *
- * We will use 31 sets, one for sending BAU messages from each of the 32
+ * We will use one set for sending BAU messages from each of the
  * cpu's on the uvhub.
  *
  * TLB shootdown will use the first of the 8 descriptors of each set.
  * Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set).
  */
 
+#define MAX_CPUS_PER_UVHUB		64
+#define MAX_CPUS_PER_SOCKET		32
+#define UV_ADP_SIZE			64 /* hardware-provided max. */
+#define UV_CPUS_PER_ACT_STATUS		32 /* hardware-provided max. */
 #define UV_ITEMS_PER_DESCRIPTOR		8
 /* the 'throttle' to prevent the hardware stay-busy bug */
 #define MAX_BAU_CONCURRENT		3
-#define UV_CPUS_PER_ACT_STATUS		32
 #define UV_ACT_STATUS_MASK		0x3
 #define UV_ACT_STATUS_SIZE		2
-#define UV_ADP_SIZE			32
 #define UV_DISTRIBUTION_SIZE		256
 #define UV_SW_ACK_NPENDING		8
 #define UV_NET_ENDPOINT_INTD		0x38
@@ -100,7 +102,6 @@
  * number of destination side software ack resources
  */
 #define DEST_NUM_RESOURCES		8
-#define MAX_CPUS_PER_NODE		32
 /*
  * completion statuses for sending a TLB flush message
  */
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index ba9caa808a9c1b42c6a616968c57e96769039314..df58e9cad96ae9441a4f86f22900a6e0bf05aa64 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -1341,7 +1341,7 @@ uv_activation_descriptor_init(int node, int pnode)
 
 	/*
 	 * each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR)
-	 * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub
+	 * per cpu; and one per cpu on the uvhub (UV_ADP_SIZE)
 	 */
 	bau_desc = kmalloc_node(sizeof(struct bau_desc) * UV_ADP_SIZE
 				* UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node);
@@ -1490,7 +1490,7 @@ calculate_destination_timeout(void)
 /*
  * initialize the bau_control structure for each cpu
  */
-static void __init uv_init_per_cpu(int nuvhubs)
+static int __init uv_init_per_cpu(int nuvhubs)
 {
 	int i;
 	int cpu;
@@ -1507,7 +1507,7 @@ static void __init uv_init_per_cpu(int nuvhubs)
 	struct bau_control *smaster = NULL;
 	struct socket_desc {
 		short num_cpus;
-		short cpu_number[16];
+		short cpu_number[MAX_CPUS_PER_SOCKET];
 	};
 	struct uvhub_desc {
 		unsigned short socket_mask;
@@ -1540,6 +1540,10 @@ static void __init uv_init_per_cpu(int nuvhubs)
 		sdp = &bdp->socket[socket];
 		sdp->cpu_number[sdp->num_cpus] = cpu;
 		sdp->num_cpus++;
+		if (sdp->num_cpus > MAX_CPUS_PER_SOCKET) {
+			printk(KERN_EMERG "%d cpus per socket invalid\n", sdp->num_cpus);
+			return 1;
+		}
 	}
 	for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
 		if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
@@ -1570,6 +1574,12 @@ static void __init uv_init_per_cpu(int nuvhubs)
 				bcp->uvhub_master = hmaster;
 				bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
 						blade_processor_id;
+				if (bcp->uvhub_cpu >= MAX_CPUS_PER_UVHUB) {
+					printk(KERN_EMERG
+						"%d cpus per uvhub invalid\n",
+						bcp->uvhub_cpu);
+					return 1;
+				}
 			}
 nextsocket:
 			socket++;
@@ -1595,6 +1605,7 @@ static void __init uv_init_per_cpu(int nuvhubs)
 		bcp->congested_reps = congested_reps;
 		bcp->congested_period = congested_period;
 	}
+	return 0;
 }
 
 /*
@@ -1625,7 +1636,10 @@ static int __init uv_bau_init(void)
 	spin_lock_init(&disable_lock);
 	congested_cycles = microsec_2_cycles(congested_response_us);
 
-	uv_init_per_cpu(nuvhubs);
+	if (uv_init_per_cpu(nuvhubs)) {
+		nobau = 1;
+		return 0;
+	}
 
 	uv_partition_base_pnode = 0x7fffffff;
 	for (uvhub = 0; uvhub < nuvhubs; uvhub++)