row0upd.c:

  Add UNIV_UNLIKELY hint.
lock0lock.c:
  Correct the prototypes of lock_deadlock_recursive() and
  lock_deadlock_occurs().
data0data.c:
  dtuple_convert_big_rec(): Add UNIV_UNLIKELY hint.
ha_innodb.cc:
  ha_innobase::write_row(): Correct the type of 'mode'.

innobase/data/data0data.c

@@ -502,7 +502,7 @@ dtuple_convert_big_rec(
 
 	size = rec_get_converted_size(index, entry);
 
-	if (size > 1000000000) {
+	if (UNIV_UNLIKELY(size > 1000000000)) {
 		fprintf(stderr,
 "InnoDB: Warning: tuple size very big: %lu\n", (ulong) size);
 		fputs("InnoDB: Tuple contents: ", stderr);

innobase/lock/lock0lock.c

@@ -348,17 +348,26 @@ static
 ibool
 lock_deadlock_occurs(
 /*=================*/
-			/* out: TRUE if a deadlock was detected */
+			/* out: TRUE if a deadlock was detected and we
+			chose trx as a victim; FALSE if no deadlock, or
+			there was a deadlock, but we chose other
+			transaction(s) as victim(s) */
 	lock_t*	lock,	/* in: lock the transaction is requesting */
 	trx_t*	trx);	/* in: transaction */
 /************************************************************************
 Looks recursively for a deadlock. */
 static
-ibool
+ulint
 lock_deadlock_recursive(
 /*====================*/
-				/* out: TRUE if a deadlock was detected
-				or the calculation took too long */
+				/* out: 0 if no deadlock found,
+				LOCK_VICTIM_IS_START if there was a deadlock
+				and we chose 'start' as the victim,
+				LOCK_VICTIM_IS_OTHER if a deadlock
+				was found and we chose some other trx as a
+				victim: we must do the search again in this
+				last case because there may be another
+				deadlock! */
 	trx_t*	start,		/* in: recursion starting point */
 	trx_t*	trx,		/* in: a transaction waiting for a lock */
 	lock_t*	wait_lock,	/* in: the lock trx is waiting to be granted */

innobase/row/row0upd.c

@@ -1270,7 +1270,7 @@ row_upd_sec_index_entry(
 
 	rec = btr_cur_get_rec(btr_cur);
 
-	if (!found) {
+	if (UNIV_UNLIKELY(!found)) {
 		fputs("InnoDB: error in sec index entry update in\n"
 			"InnoDB: ", stderr);
 		dict_index_name_print(stderr, trx, index);

sql/ha_innodb.cc

@@ -2834,7 +2834,7 @@ ha_innobase::write_row(
 		being blocked by a MySQL table lock TL_WRITE_ALLOW_READ. */
 
 		dict_table_t*	src_table;
-		ibool		mode;
+		ulint		mode;
 
 		num_write_row = 0;