debug_core,kdb: Allow the debug core to process a recursive debug entry

This allows kdb to debug a crash with in the kms code with a single level recursive re-entry. Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

debug_core,kdb: Allow the debug core to process a recursive debug entry
This allows kdb to debug a crash with in the kms code with a single level recursive re-entry. Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Jason Wessel
1 parent d37d39ae3b
Showing 1 changed file with 7 additions and 0 deletions Side-by-side Diff
kernel/debug/debug_core.c
@@ -445,6 +445,10 @@
 	}
  
 	printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
+#ifdef CONFIG_KGDB_KDB
+	/* Allow kdb to debug itself one level */
+	return 0;
+#endif
 	dump_stack();
 	panic("Recursive entry to debugger");
  
@@ -488,6 +492,9 @@
 	 * our cpu_in_kgdb[] flag setting does:
 	 */
 	atomic_inc(&cpu_in_kgdb[cpu]);
+
+	if (exception_level == 1)
+		goto cpu_master_loop;
  
 	/*
 	 * CPU will loop if it is a slave or request to become a kgdb
...	...	@@ -445,6 +445,10 @@
445	445	}
446	446
447	447	printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
	448	+#ifdef CONFIG_KGDB_KDB
	449	+ /* Allow kdb to debug itself one level */
	450	+ return 0;
	451	+#endif
448	452	dump_stack();
449	453	panic("Recursive entry to debugger");
450	454
...	...	@@ -488,6 +492,9 @@
488	492	* our cpu_in_kgdb[] flag setting does:
489	493	*/
490	494	atomic_inc(&cpu_in_kgdb[cpu]);
	495	+
	496	+ if (exception_level == 1)
	497	+ goto cpu_master_loop;
491	498
492	499	/*
493	500	* CPU will loop if it is a slave or request to become a kgdb