debugobjects: Add hint for better object identification

In complex subsystems like mac80211 structures can contain several
timers and work structs, so identifying a specific instance from the
call trace and object type output of debugobjects can be hard.

Allow the subsystems which support debugobjects to provide a hint
function. This function returns a pointer to a kernel address
(preferrably the objects callback function) which is printed along
with the debugobjects type.

Add hint methods for timer_list, work_struct and hrtimer.

[ tglx: Massaged changelog, made it compile ]

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
LKML-Reference: <20110307085809.GA9334@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index deebcc57d4e6..9d86e45086f5 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -249,14 +249,17 @@ static struct debug_bucket *get_bucket(unsigned long addr)
 
 static void debug_print_object(struct debug_obj *obj, char *msg)
 {
+        struct debug_obj_descr *descr = obj->descr;
         static int limit;
 
-        if (limit < 5 && obj->descr != descr_test) {
+        if (limit < 5 && descr != descr_test) {
+                void *hint = descr->debug_hint ?
+                        descr->debug_hint(obj->object) : NULL;
                 limit++;
                 WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) "
-                                 "object type: %s\n",
+                                 "object type: %s hint: %pS\n",
                         msg, obj_states[obj->state], obj->astate,
-                        obj->descr->name);
+                        descr->name, hint);
         }
         debug_objects_warnings++;
 }