SGI UV: TLB shootdown using broadcast assist unit

TLB shootdown for SGI UV.

v5: 6/12 corrections/improvements per Ingo's second review
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/uv/uv_bau.h

@@ -68,11 +68,11 @@
 /*
  * number of entries in the destination side payload queue
  */
-#define DESTINATION_PAYLOAD_QUEUE_SIZE  17
+#define DEST_Q_SIZE			17
 /*
  * number of destination side software ack resources
  */
-#define DESTINATION_NUM_RESOURCES       8
+#define DEST_NUM_RESOURCES		8
 #define MAX_CPUS_PER_NODE		32
 /*
  * completion statuses for sending a TLB flush message
@@ -197,10 +197,11 @@ struct bau_msg_header {
 };
 
 /*
+ * The activation descriptor:
  * The format of the message to send, plus all accompanying control
  * Should be 64 bytes
  */
-struct bau_activation_descriptor {
+struct bau_desc {
 	struct bau_target_nodemask distribution;
 	/*
 	 * message template, consisting of header and payload:
@@ -281,7 +282,7 @@ struct bau_sw_ack_status {
  * one on every node and per-cpu; to locate the software tables
  */
 struct bau_control {
-	struct bau_activation_descriptor *descriptor_base;
+	struct bau_desc *descriptor_base;
 	struct bau_payload_queue_entry *bau_msg_head;
 	struct bau_payload_queue_entry *va_queue_first;
 	struct bau_payload_queue_entry *va_queue_last;