--- ptdump-1.0.3/ptdump.c.orig
+++ ptdump-1.0.3/ptdump.c
@@ -502,6 +502,14 @@ cmd_ptdump(void)
 		return;
 	}
 
+	/* 
+	 * Set the gdb scope to ensure that the appropriate ring_buffer 
+	 * structure is selected. 
+	 */
+	if (kernel_symbol_exists("perf_mmap_to_page"))
+		gdb_set_crash_scope(symbol_value("perf_mmap_to_page"), 
+			"perf_mmap_to_page");
+
 	online_cpus = get_cpus_online();
 	list_len = sizeof(struct pt_info)*kt->cpus;
 	pt_info_list = malloc(list_len);