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>
diff --git a/include/linux/debugobjects.h b/include/linux/debugobjects.h
index 597692f..65970b8 100644
--- a/include/linux/debugobjects.h
+++ b/include/linux/debugobjects.h
@@ -34,7 +34,10 @@
/**
* struct debug_obj_descr - object type specific debug description structure
+ *
* @name: name of the object typee
+ * @debug_hint: function returning address, which have associated
+ * kernel symbol, to allow identify the object
* @fixup_init: fixup function, which is called when the init check
* fails
* @fixup_activate: fixup function, which is called when the activate check
@@ -46,7 +49,7 @@
*/
struct debug_obj_descr {
const char *name;
-
+ void *(*debug_hint) (void *addr);
int (*fixup_init) (void *addr, enum debug_obj_state state);
int (*fixup_activate) (void *addr, enum debug_obj_state state);
int (*fixup_destroy) (void *addr, enum debug_obj_state state);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 0c8d7c0..e38f5a0 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -334,6 +334,11 @@
static struct debug_obj_descr hrtimer_debug_descr;
+static void *hrtimer_debug_hint(void *addr)
+{
+ return ((struct hrtimer *) addr)->function;
+}
+
/*
* fixup_init is called when:
* - an active object is initialized
@@ -393,6 +398,7 @@
static struct debug_obj_descr hrtimer_debug_descr = {
.name = "hrtimer",
+ .debug_hint = hrtimer_debug_hint,
.fixup_init = hrtimer_fixup_init,
.fixup_activate = hrtimer_fixup_activate,
.fixup_free = hrtimer_fixup_free,
diff --git a/kernel/timer.c b/kernel/timer.c
index d645992..33a6792 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -404,6 +404,11 @@
static struct debug_obj_descr timer_debug_descr;
+static void *timer_debug_hint(void *addr)
+{
+ return ((struct timer_list *) addr)->function;
+}
+
/*
* fixup_init is called when:
* - an active object is initialized
@@ -477,6 +482,7 @@
static struct debug_obj_descr timer_debug_descr = {
.name = "timer_list",
+ .debug_hint = timer_debug_hint,
.fixup_init = timer_fixup_init,
.fixup_activate = timer_fixup_activate,
.fixup_free = timer_fixup_free,
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ee6578b..b5fe4c0 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -316,6 +316,11 @@
static struct debug_obj_descr work_debug_descr;
+static void *work_debug_hint(void *addr)
+{
+ return ((struct work_struct *) addr)->func;
+}
+
/*
* fixup_init is called when:
* - an active object is initialized
@@ -387,6 +392,7 @@
static struct debug_obj_descr work_debug_descr = {
.name = "work_struct",
+ .debug_hint = work_debug_hint,
.fixup_init = work_fixup_init,
.fixup_activate = work_fixup_activate,
.fixup_free = work_fixup_free,
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index deebcc5..9d86e45 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -249,14 +249,17 @@
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++;
}