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debugobjects: Add hint for better object identification

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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>
This commit is contained in:
Stanislaw Gruszka 2011-03-07 09:58:33 +01:00 • committed by Thomas Gleixner
parent a5abba989d
commit 9977728840
5 changed files with 28 additions and 4 deletions
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9
lib/debugobjects.c
View file

@ -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++;
}