Merge from 4.0

sql/sql_update.cc:
  Auto merged
sql/sql_yacc.yy:
  Merged from 4.0

sql/sql_update.cc

@@ -574,7 +574,10 @@ int mysql_multi_update_lock(THD *thd,
       else
       {
         DBUG_PRINT("info",("setting table `%s` for read-only", tl->alias));
-	tl->lock_type= TL_READ;
+	// If we are using the binary log, we need TL_READ_NO_INSERT to get
+	// correct order of statements. Otherwise, we use a TL_READ lock to
+	// improve performance.
+	tl->lock_type= using_update_log ? TL_READ_NO_INSERT : TL_READ;
 	tl->updating= 0;
 	wants= SELECT_ACL;
       }

sql/sql_yacc.yy

@@ -1111,7 +1111,7 @@ create_select:
           SELECT_SYM
           {
 	    LEX *lex=Lex;
-	    lex->lock_option= (using_update_log) ? TL_READ_NO_INSERT : TL_READ;
+	    lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
 	    if (lex->sql_command == SQLCOM_INSERT)
 	      lex->sql_command= SQLCOM_INSERT_SELECT;
 	    else if (lex->sql_command == SQLCOM_REPLACE)