blob: 37061ede8b8124e7fa59cd0963ede7ba27979007 [file] [log] [blame]
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -07001/*
2 * Generic infrastructure for lifetime debugging of objects.
3 *
4 * Started by Thomas Gleixner
5 *
6 * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de>
7 *
8 * For licencing details see kernel-base/COPYING
9 */
10#include <linux/debugobjects.h>
11#include <linux/interrupt.h>
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040012#include <linux/sched.h>
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070013#include <linux/seq_file.h>
14#include <linux/debugfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070016#include <linux/hash.h>
17
18#define ODEBUG_HASH_BITS 14
19#define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS)
20
21#define ODEBUG_POOL_SIZE 512
22#define ODEBUG_POOL_MIN_LEVEL 256
23
24#define ODEBUG_CHUNK_SHIFT PAGE_SHIFT
25#define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT)
26#define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1))
27
28struct debug_bucket {
29 struct hlist_head list;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +010030 raw_spinlock_t lock;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070031};
32
33static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE];
34
Thomas Gleixner1be1cb72009-03-16 18:53:18 +010035static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070036
Thomas Gleixneraef9cb02009-11-17 18:11:28 +010037static DEFINE_RAW_SPINLOCK(pool_lock);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070038
39static HLIST_HEAD(obj_pool);
40
41static int obj_pool_min_free = ODEBUG_POOL_SIZE;
42static int obj_pool_free = ODEBUG_POOL_SIZE;
43static int obj_pool_used;
44static int obj_pool_max_used;
45static struct kmem_cache *obj_cache;
46
47static int debug_objects_maxchain __read_mostly;
48static int debug_objects_fixups __read_mostly;
49static int debug_objects_warnings __read_mostly;
Ingo Molnar3ae70202008-11-26 10:02:00 +010050static int debug_objects_enabled __read_mostly
51 = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT;
52
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070053static struct debug_obj_descr *descr_test __read_mostly;
54
Thomas Gleixner337fff82009-03-16 10:04:53 +010055static void free_obj_work(struct work_struct *work);
56static DECLARE_WORK(debug_obj_work, free_obj_work);
57
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070058static int __init enable_object_debug(char *str)
59{
60 debug_objects_enabled = 1;
61 return 0;
62}
Kyle McMartin3e8ebb52009-03-01 20:41:41 -050063
64static int __init disable_object_debug(char *str)
65{
66 debug_objects_enabled = 0;
67 return 0;
68}
69
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070070early_param("debug_objects", enable_object_debug);
Kyle McMartin3e8ebb52009-03-01 20:41:41 -050071early_param("no_debug_objects", disable_object_debug);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070072
73static const char *obj_states[ODEBUG_STATE_MAX] = {
74 [ODEBUG_STATE_NONE] = "none",
75 [ODEBUG_STATE_INIT] = "initialized",
76 [ODEBUG_STATE_INACTIVE] = "inactive",
77 [ODEBUG_STATE_ACTIVE] = "active",
78 [ODEBUG_STATE_DESTROYED] = "destroyed",
79 [ODEBUG_STATE_NOTAVAILABLE] = "not available",
80};
81
Thomas Gleixner1fda1072012-04-11 11:52:18 +020082static void fill_pool(void)
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070083{
84 gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN;
85 struct debug_obj *new;
Vegard Nossum50db04dd2008-06-15 00:47:36 +020086 unsigned long flags;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070087
88 if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL))
Thomas Gleixner1fda1072012-04-11 11:52:18 +020089 return;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070090
91 if (unlikely(!obj_cache))
Thomas Gleixner1fda1072012-04-11 11:52:18 +020092 return;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070093
94 while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) {
95
96 new = kmem_cache_zalloc(obj_cache, gfp);
97 if (!new)
Dan Carpenter33408082012-04-18 14:28:10 +030098 return;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070099
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100100 raw_spin_lock_irqsave(&pool_lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700101 hlist_add_head(&new->node, &obj_pool);
102 obj_pool_free++;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100103 raw_spin_unlock_irqrestore(&pool_lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700104 }
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700105}
106
107/*
108 * Lookup an object in the hash bucket.
109 */
110static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b)
111{
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700112 struct debug_obj *obj;
113 int cnt = 0;
114
Sasha Levinb67bfe02013-02-27 17:06:00 -0800115 hlist_for_each_entry(obj, &b->list, node) {
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700116 cnt++;
117 if (obj->object == addr)
118 return obj;
119 }
120 if (cnt > debug_objects_maxchain)
121 debug_objects_maxchain = cnt;
122
123 return NULL;
124}
125
126/*
Vegard Nossum50db04dd2008-06-15 00:47:36 +0200127 * Allocate a new object. If the pool is empty, switch off the debugger.
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200128 * Must be called with interrupts disabled.
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700129 */
130static struct debug_obj *
131alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr)
132{
133 struct debug_obj *obj = NULL;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700134
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100135 raw_spin_lock(&pool_lock);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700136 if (obj_pool.first) {
137 obj = hlist_entry(obj_pool.first, typeof(*obj), node);
138
139 obj->object = addr;
140 obj->descr = descr;
141 obj->state = ODEBUG_STATE_NONE;
Mathieu Desnoyersa5d8e462010-04-17 08:48:38 -0400142 obj->astate = 0;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700143 hlist_del(&obj->node);
144
145 hlist_add_head(&obj->node, &b->list);
146
147 obj_pool_used++;
148 if (obj_pool_used > obj_pool_max_used)
149 obj_pool_max_used = obj_pool_used;
150
151 obj_pool_free--;
152 if (obj_pool_free < obj_pool_min_free)
153 obj_pool_min_free = obj_pool_free;
154 }
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100155 raw_spin_unlock(&pool_lock);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700156
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700157 return obj;
158}
159
160/*
Thomas Gleixner337fff82009-03-16 10:04:53 +0100161 * workqueue function to free objects.
162 */
163static void free_obj_work(struct work_struct *work)
164{
165 struct debug_obj *obj;
166 unsigned long flags;
167
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100168 raw_spin_lock_irqsave(&pool_lock, flags);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100169 while (obj_pool_free > ODEBUG_POOL_SIZE) {
170 obj = hlist_entry(obj_pool.first, typeof(*obj), node);
171 hlist_del(&obj->node);
172 obj_pool_free--;
173 /*
174 * We release pool_lock across kmem_cache_free() to
175 * avoid contention on pool_lock.
176 */
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100177 raw_spin_unlock_irqrestore(&pool_lock, flags);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100178 kmem_cache_free(obj_cache, obj);
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100179 raw_spin_lock_irqsave(&pool_lock, flags);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100180 }
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100181 raw_spin_unlock_irqrestore(&pool_lock, flags);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100182}
183
184/*
185 * Put the object back into the pool and schedule work to free objects
186 * if necessary.
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700187 */
188static void free_object(struct debug_obj *obj)
189{
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200190 unsigned long flags;
Thomas Gleixner337fff82009-03-16 10:04:53 +0100191 int sched = 0;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700192
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100193 raw_spin_lock_irqsave(&pool_lock, flags);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100194 /*
195 * schedule work when the pool is filled and the cache is
196 * initialized:
197 */
198 if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache)
Marcin Slusarz161b6ae2011-05-28 13:23:42 +0200199 sched = keventd_up() && !work_pending(&debug_obj_work);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100200 hlist_add_head(&obj->node, &obj_pool);
201 obj_pool_free++;
202 obj_pool_used--;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100203 raw_spin_unlock_irqrestore(&pool_lock, flags);
Thomas Gleixner337fff82009-03-16 10:04:53 +0100204 if (sched)
205 schedule_work(&debug_obj_work);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700206}
207
208/*
209 * We run out of memory. That means we probably have tons of objects
210 * allocated.
211 */
212static void debug_objects_oom(void)
213{
214 struct debug_bucket *db = obj_hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800215 struct hlist_node *tmp;
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200216 HLIST_HEAD(freelist);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700217 struct debug_obj *obj;
218 unsigned long flags;
219 int i;
220
221 printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n");
222
223 for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100224 raw_spin_lock_irqsave(&db->lock, flags);
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200225 hlist_move_list(&db->list, &freelist);
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100226 raw_spin_unlock_irqrestore(&db->lock, flags);
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200227
228 /* Now free them */
Sasha Levinb67bfe02013-02-27 17:06:00 -0800229 hlist_for_each_entry_safe(obj, tmp, &freelist, node) {
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700230 hlist_del(&obj->node);
231 free_object(obj);
232 }
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700233 }
234}
235
236/*
237 * We use the pfn of the address for the hash. That way we can check
238 * for freed objects simply by checking the affected bucket.
239 */
240static struct debug_bucket *get_bucket(unsigned long addr)
241{
242 unsigned long hash;
243
244 hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS);
245 return &obj_hash[hash];
246}
247
248static void debug_print_object(struct debug_obj *obj, char *msg)
249{
Stanislaw Gruszka99777282011-03-07 09:58:33 +0100250 struct debug_obj_descr *descr = obj->descr;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700251 static int limit;
252
Stanislaw Gruszka99777282011-03-07 09:58:33 +0100253 if (limit < 5 && descr != descr_test) {
254 void *hint = descr->debug_hint ?
255 descr->debug_hint(obj->object) : NULL;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700256 limit++;
Mathieu Desnoyersa5d8e462010-04-17 08:48:38 -0400257 WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) "
Stanislaw Gruszka99777282011-03-07 09:58:33 +0100258 "object type: %s hint: %pS\n",
Mathieu Desnoyersa5d8e462010-04-17 08:48:38 -0400259 msg, obj_states[obj->state], obj->astate,
Stanislaw Gruszka99777282011-03-07 09:58:33 +0100260 descr->name, hint);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700261 }
262 debug_objects_warnings++;
263}
264
265/*
266 * Try to repair the damage, so we have a better chance to get useful
267 * debug output.
268 */
Stephen Boydfeac18d2011-11-07 19:48:26 -0800269static int
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700270debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
271 void * addr, enum debug_obj_state state)
272{
Stephen Boydfeac18d2011-11-07 19:48:26 -0800273 int fixed = 0;
274
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700275 if (fixup)
Stephen Boydfeac18d2011-11-07 19:48:26 -0800276 fixed = fixup(addr, state);
277 debug_objects_fixups += fixed;
278 return fixed;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700279}
280
281static void debug_object_is_on_stack(void *addr, int onstack)
282{
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700283 int is_on_stack;
284 static int limit;
285
286 if (limit > 4)
287 return;
288
FUJITA Tomonori8b05c7e2008-07-23 21:26:53 -0700289 is_on_stack = object_is_on_stack(addr);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700290 if (is_on_stack == onstack)
291 return;
292
293 limit++;
294 if (is_on_stack)
295 printk(KERN_WARNING
296 "ODEBUG: object is on stack, but not annotated\n");
297 else
298 printk(KERN_WARNING
299 "ODEBUG: object is not on stack, but annotated\n");
300 WARN_ON(1);
301}
302
303static void
304__debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
305{
306 enum debug_obj_state state;
307 struct debug_bucket *db;
308 struct debug_obj *obj;
309 unsigned long flags;
310
Vegard Nossum50db04dd2008-06-15 00:47:36 +0200311 fill_pool();
312
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700313 db = get_bucket((unsigned long) addr);
314
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100315 raw_spin_lock_irqsave(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700316
317 obj = lookup_object(addr, db);
318 if (!obj) {
319 obj = alloc_object(addr, db, descr);
320 if (!obj) {
321 debug_objects_enabled = 0;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100322 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700323 debug_objects_oom();
324 return;
325 }
326 debug_object_is_on_stack(addr, onstack);
327 }
328
329 switch (obj->state) {
330 case ODEBUG_STATE_NONE:
331 case ODEBUG_STATE_INIT:
332 case ODEBUG_STATE_INACTIVE:
333 obj->state = ODEBUG_STATE_INIT;
334 break;
335
336 case ODEBUG_STATE_ACTIVE:
337 debug_print_object(obj, "init");
338 state = obj->state;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100339 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700340 debug_object_fixup(descr->fixup_init, addr, state);
341 return;
342
343 case ODEBUG_STATE_DESTROYED:
344 debug_print_object(obj, "init");
345 break;
346 default:
347 break;
348 }
349
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100350 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700351}
352
353/**
354 * debug_object_init - debug checks when an object is initialized
355 * @addr: address of the object
356 * @descr: pointer to an object specific debug description structure
357 */
358void debug_object_init(void *addr, struct debug_obj_descr *descr)
359{
360 if (!debug_objects_enabled)
361 return;
362
363 __debug_object_init(addr, descr, 0);
364}
365
366/**
367 * debug_object_init_on_stack - debug checks when an object on stack is
368 * initialized
369 * @addr: address of the object
370 * @descr: pointer to an object specific debug description structure
371 */
372void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr)
373{
374 if (!debug_objects_enabled)
375 return;
376
377 __debug_object_init(addr, descr, 1);
378}
379
380/**
381 * debug_object_activate - debug checks when an object is activated
382 * @addr: address of the object
383 * @descr: pointer to an object specific debug description structure
384 */
385void debug_object_activate(void *addr, struct debug_obj_descr *descr)
386{
387 enum debug_obj_state state;
388 struct debug_bucket *db;
389 struct debug_obj *obj;
390 unsigned long flags;
Stephen Boydfeac18d2011-11-07 19:48:26 -0800391 struct debug_obj o = { .object = addr,
392 .state = ODEBUG_STATE_NOTAVAILABLE,
393 .descr = descr };
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700394
395 if (!debug_objects_enabled)
396 return;
397
398 db = get_bucket((unsigned long) addr);
399
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100400 raw_spin_lock_irqsave(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700401
402 obj = lookup_object(addr, db);
403 if (obj) {
404 switch (obj->state) {
405 case ODEBUG_STATE_INIT:
406 case ODEBUG_STATE_INACTIVE:
407 obj->state = ODEBUG_STATE_ACTIVE;
408 break;
409
410 case ODEBUG_STATE_ACTIVE:
411 debug_print_object(obj, "activate");
412 state = obj->state;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100413 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700414 debug_object_fixup(descr->fixup_activate, addr, state);
415 return;
416
417 case ODEBUG_STATE_DESTROYED:
418 debug_print_object(obj, "activate");
419 break;
420 default:
421 break;
422 }
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100423 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700424 return;
425 }
426
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100427 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700428 /*
429 * This happens when a static object is activated. We
430 * let the type specific code decide whether this is
431 * true or not.
432 */
Stephen Boydfeac18d2011-11-07 19:48:26 -0800433 if (debug_object_fixup(descr->fixup_activate, addr,
434 ODEBUG_STATE_NOTAVAILABLE))
435 debug_print_object(&o, "activate");
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700436}
437
438/**
439 * debug_object_deactivate - debug checks when an object is deactivated
440 * @addr: address of the object
441 * @descr: pointer to an object specific debug description structure
442 */
443void debug_object_deactivate(void *addr, struct debug_obj_descr *descr)
444{
445 struct debug_bucket *db;
446 struct debug_obj *obj;
447 unsigned long flags;
448
449 if (!debug_objects_enabled)
450 return;
451
452 db = get_bucket((unsigned long) addr);
453
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100454 raw_spin_lock_irqsave(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700455
456 obj = lookup_object(addr, db);
457 if (obj) {
458 switch (obj->state) {
459 case ODEBUG_STATE_INIT:
460 case ODEBUG_STATE_INACTIVE:
461 case ODEBUG_STATE_ACTIVE:
Mathieu Desnoyersa5d8e462010-04-17 08:48:38 -0400462 if (!obj->astate)
463 obj->state = ODEBUG_STATE_INACTIVE;
464 else
465 debug_print_object(obj, "deactivate");
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700466 break;
467
468 case ODEBUG_STATE_DESTROYED:
469 debug_print_object(obj, "deactivate");
470 break;
471 default:
472 break;
473 }
474 } else {
475 struct debug_obj o = { .object = addr,
476 .state = ODEBUG_STATE_NOTAVAILABLE,
477 .descr = descr };
478
479 debug_print_object(&o, "deactivate");
480 }
481
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100482 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700483}
484
485/**
486 * debug_object_destroy - debug checks when an object is destroyed
487 * @addr: address of the object
488 * @descr: pointer to an object specific debug description structure
489 */
490void debug_object_destroy(void *addr, struct debug_obj_descr *descr)
491{
492 enum debug_obj_state state;
493 struct debug_bucket *db;
494 struct debug_obj *obj;
495 unsigned long flags;
496
497 if (!debug_objects_enabled)
498 return;
499
500 db = get_bucket((unsigned long) addr);
501
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100502 raw_spin_lock_irqsave(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700503
504 obj = lookup_object(addr, db);
505 if (!obj)
506 goto out_unlock;
507
508 switch (obj->state) {
509 case ODEBUG_STATE_NONE:
510 case ODEBUG_STATE_INIT:
511 case ODEBUG_STATE_INACTIVE:
512 obj->state = ODEBUG_STATE_DESTROYED;
513 break;
514 case ODEBUG_STATE_ACTIVE:
515 debug_print_object(obj, "destroy");
516 state = obj->state;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100517 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700518 debug_object_fixup(descr->fixup_destroy, addr, state);
519 return;
520
521 case ODEBUG_STATE_DESTROYED:
522 debug_print_object(obj, "destroy");
523 break;
524 default:
525 break;
526 }
527out_unlock:
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100528 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700529}
530
531/**
532 * debug_object_free - debug checks when an object is freed
533 * @addr: address of the object
534 * @descr: pointer to an object specific debug description structure
535 */
536void debug_object_free(void *addr, struct debug_obj_descr *descr)
537{
538 enum debug_obj_state state;
539 struct debug_bucket *db;
540 struct debug_obj *obj;
541 unsigned long flags;
542
543 if (!debug_objects_enabled)
544 return;
545
546 db = get_bucket((unsigned long) addr);
547
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100548 raw_spin_lock_irqsave(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700549
550 obj = lookup_object(addr, db);
551 if (!obj)
552 goto out_unlock;
553
554 switch (obj->state) {
555 case ODEBUG_STATE_ACTIVE:
556 debug_print_object(obj, "free");
557 state = obj->state;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100558 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700559 debug_object_fixup(descr->fixup_free, addr, state);
560 return;
561 default:
562 hlist_del(&obj->node);
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100563 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700564 free_object(obj);
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200565 return;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700566 }
567out_unlock:
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100568 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700569}
570
Mathieu Desnoyersa5d8e462010-04-17 08:48:38 -0400571/**
Christine Chanb84d4352011-11-07 19:48:27 -0800572 * debug_object_assert_init - debug checks when object should be init-ed
573 * @addr: address of the object
574 * @descr: pointer to an object specific debug description structure
575 */
576void debug_object_assert_init(void *addr, struct debug_obj_descr *descr)
577{
578 struct debug_bucket *db;
579 struct debug_obj *obj;
580 unsigned long flags;
581
582 if (!debug_objects_enabled)
583 return;
584
585 db = get_bucket((unsigned long) addr);
586
587 raw_spin_lock_irqsave(&db->lock, flags);
588
589 obj = lookup_object(addr, db);
590 if (!obj) {
591 struct debug_obj o = { .object = addr,
592 .state = ODEBUG_STATE_NOTAVAILABLE,
593 .descr = descr };
594
595 raw_spin_unlock_irqrestore(&db->lock, flags);
596 /*
597 * Maybe the object is static. Let the type specific
598 * code decide what to do.
599 */
600 if (debug_object_fixup(descr->fixup_assert_init, addr,
601 ODEBUG_STATE_NOTAVAILABLE))
602 debug_print_object(&o, "assert_init");
603 return;
604 }
605
606 raw_spin_unlock_irqrestore(&db->lock, flags);
607}
608
609/**
Mathieu Desnoyersa5d8e462010-04-17 08:48:38 -0400610 * debug_object_active_state - debug checks object usage state machine
611 * @addr: address of the object
612 * @descr: pointer to an object specific debug description structure
613 * @expect: expected state
614 * @next: state to move to if expected state is found
615 */
616void
617debug_object_active_state(void *addr, struct debug_obj_descr *descr,
618 unsigned int expect, unsigned int next)
619{
620 struct debug_bucket *db;
621 struct debug_obj *obj;
622 unsigned long flags;
623
624 if (!debug_objects_enabled)
625 return;
626
627 db = get_bucket((unsigned long) addr);
628
629 raw_spin_lock_irqsave(&db->lock, flags);
630
631 obj = lookup_object(addr, db);
632 if (obj) {
633 switch (obj->state) {
634 case ODEBUG_STATE_ACTIVE:
635 if (obj->astate == expect)
636 obj->astate = next;
637 else
638 debug_print_object(obj, "active_state");
639 break;
640
641 default:
642 debug_print_object(obj, "active_state");
643 break;
644 }
645 } else {
646 struct debug_obj o = { .object = addr,
647 .state = ODEBUG_STATE_NOTAVAILABLE,
648 .descr = descr };
649
650 debug_print_object(&o, "active_state");
651 }
652
653 raw_spin_unlock_irqrestore(&db->lock, flags);
654}
655
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700656#ifdef CONFIG_DEBUG_OBJECTS_FREE
657static void __debug_check_no_obj_freed(const void *address, unsigned long size)
658{
659 unsigned long flags, oaddr, saddr, eaddr, paddr, chunks;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800660 struct hlist_node *tmp;
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200661 HLIST_HEAD(freelist);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700662 struct debug_obj_descr *descr;
663 enum debug_obj_state state;
664 struct debug_bucket *db;
665 struct debug_obj *obj;
666 int cnt;
667
668 saddr = (unsigned long) address;
669 eaddr = saddr + size;
670 paddr = saddr & ODEBUG_CHUNK_MASK;
671 chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1));
672 chunks >>= ODEBUG_CHUNK_SHIFT;
673
674 for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) {
675 db = get_bucket(paddr);
676
677repeat:
678 cnt = 0;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100679 raw_spin_lock_irqsave(&db->lock, flags);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800680 hlist_for_each_entry_safe(obj, tmp, &db->list, node) {
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700681 cnt++;
682 oaddr = (unsigned long) obj->object;
683 if (oaddr < saddr || oaddr >= eaddr)
684 continue;
685
686 switch (obj->state) {
687 case ODEBUG_STATE_ACTIVE:
688 debug_print_object(obj, "free");
689 descr = obj->descr;
690 state = obj->state;
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100691 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700692 debug_object_fixup(descr->fixup_free,
693 (void *) oaddr, state);
694 goto repeat;
695 default:
696 hlist_del(&obj->node);
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200697 hlist_add_head(&obj->node, &freelist);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700698 break;
699 }
700 }
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100701 raw_spin_unlock_irqrestore(&db->lock, flags);
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200702
703 /* Now free them */
Sasha Levinb67bfe02013-02-27 17:06:00 -0800704 hlist_for_each_entry_safe(obj, tmp, &freelist, node) {
Vegard Nossum673d62cc2008-08-31 23:39:21 +0200705 hlist_del(&obj->node);
706 free_object(obj);
707 }
708
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700709 if (cnt > debug_objects_maxchain)
710 debug_objects_maxchain = cnt;
711 }
712}
713
714void debug_check_no_obj_freed(const void *address, unsigned long size)
715{
716 if (debug_objects_enabled)
717 __debug_check_no_obj_freed(address, size);
718}
719#endif
720
721#ifdef CONFIG_DEBUG_FS
722
723static int debug_stats_show(struct seq_file *m, void *v)
724{
725 seq_printf(m, "max_chain :%d\n", debug_objects_maxchain);
726 seq_printf(m, "warnings :%d\n", debug_objects_warnings);
727 seq_printf(m, "fixups :%d\n", debug_objects_fixups);
728 seq_printf(m, "pool_free :%d\n", obj_pool_free);
729 seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
730 seq_printf(m, "pool_used :%d\n", obj_pool_used);
731 seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
732 return 0;
733}
734
735static int debug_stats_open(struct inode *inode, struct file *filp)
736{
737 return single_open(filp, debug_stats_show, NULL);
738}
739
740static const struct file_operations debug_stats_fops = {
741 .open = debug_stats_open,
742 .read = seq_read,
743 .llseek = seq_lseek,
744 .release = single_release,
745};
746
747static int __init debug_objects_init_debugfs(void)
748{
749 struct dentry *dbgdir, *dbgstats;
750
751 if (!debug_objects_enabled)
752 return 0;
753
754 dbgdir = debugfs_create_dir("debug_objects", NULL);
755 if (!dbgdir)
756 return -ENOMEM;
757
758 dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL,
759 &debug_stats_fops);
760 if (!dbgstats)
761 goto err;
762
763 return 0;
764
765err:
766 debugfs_remove(dbgdir);
767
768 return -ENOMEM;
769}
770__initcall(debug_objects_init_debugfs);
771
772#else
773static inline void debug_objects_init_debugfs(void) { }
774#endif
775
776#ifdef CONFIG_DEBUG_OBJECTS_SELFTEST
777
778/* Random data structure for the self test */
779struct self_test {
780 unsigned long dummy1[6];
781 int static_init;
782 unsigned long dummy2[3];
783};
784
785static __initdata struct debug_obj_descr descr_type_test;
786
787/*
788 * fixup_init is called when:
789 * - an active object is initialized
790 */
791static int __init fixup_init(void *addr, enum debug_obj_state state)
792{
793 struct self_test *obj = addr;
794
795 switch (state) {
796 case ODEBUG_STATE_ACTIVE:
797 debug_object_deactivate(obj, &descr_type_test);
798 debug_object_init(obj, &descr_type_test);
799 return 1;
800 default:
801 return 0;
802 }
803}
804
805/*
806 * fixup_activate is called when:
807 * - an active object is activated
808 * - an unknown object is activated (might be a statically initialized object)
809 */
810static int __init fixup_activate(void *addr, enum debug_obj_state state)
811{
812 struct self_test *obj = addr;
813
814 switch (state) {
815 case ODEBUG_STATE_NOTAVAILABLE:
816 if (obj->static_init == 1) {
817 debug_object_init(obj, &descr_type_test);
818 debug_object_activate(obj, &descr_type_test);
Stephen Boyd9f78ff02012-03-05 14:59:17 -0800819 return 0;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700820 }
Stephen Boyd9f78ff02012-03-05 14:59:17 -0800821 return 1;
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700822
823 case ODEBUG_STATE_ACTIVE:
824 debug_object_deactivate(obj, &descr_type_test);
825 debug_object_activate(obj, &descr_type_test);
826 return 1;
827
828 default:
829 return 0;
830 }
831}
832
833/*
834 * fixup_destroy is called when:
835 * - an active object is destroyed
836 */
837static int __init fixup_destroy(void *addr, enum debug_obj_state state)
838{
839 struct self_test *obj = addr;
840
841 switch (state) {
842 case ODEBUG_STATE_ACTIVE:
843 debug_object_deactivate(obj, &descr_type_test);
844 debug_object_destroy(obj, &descr_type_test);
845 return 1;
846 default:
847 return 0;
848 }
849}
850
851/*
852 * fixup_free is called when:
853 * - an active object is freed
854 */
855static int __init fixup_free(void *addr, enum debug_obj_state state)
856{
857 struct self_test *obj = addr;
858
859 switch (state) {
860 case ODEBUG_STATE_ACTIVE:
861 debug_object_deactivate(obj, &descr_type_test);
862 debug_object_free(obj, &descr_type_test);
863 return 1;
864 default:
865 return 0;
866 }
867}
868
Henrik Kretzschmar1fb2f772010-03-26 20:38:35 +0100869static int __init
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700870check_results(void *addr, enum debug_obj_state state, int fixups, int warnings)
871{
872 struct debug_bucket *db;
873 struct debug_obj *obj;
874 unsigned long flags;
875 int res = -EINVAL;
876
877 db = get_bucket((unsigned long) addr);
878
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100879 raw_spin_lock_irqsave(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700880
881 obj = lookup_object(addr, db);
882 if (!obj && state != ODEBUG_STATE_NONE) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700883 WARN(1, KERN_ERR "ODEBUG: selftest object not found\n");
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700884 goto out;
885 }
886 if (obj && obj->state != state) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700887 WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n",
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700888 obj->state, state);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700889 goto out;
890 }
891 if (fixups != debug_objects_fixups) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700892 WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n",
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700893 fixups, debug_objects_fixups);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700894 goto out;
895 }
896 if (warnings != debug_objects_warnings) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700897 WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n",
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700898 warnings, debug_objects_warnings);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700899 goto out;
900 }
901 res = 0;
902out:
Thomas Gleixneraef9cb02009-11-17 18:11:28 +0100903 raw_spin_unlock_irqrestore(&db->lock, flags);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700904 if (res)
905 debug_objects_enabled = 0;
906 return res;
907}
908
909static __initdata struct debug_obj_descr descr_type_test = {
910 .name = "selftest",
911 .fixup_init = fixup_init,
912 .fixup_activate = fixup_activate,
913 .fixup_destroy = fixup_destroy,
914 .fixup_free = fixup_free,
915};
916
917static __initdata struct self_test obj = { .static_init = 0 };
918
919static void __init debug_objects_selftest(void)
920{
921 int fixups, oldfixups, warnings, oldwarnings;
922 unsigned long flags;
923
924 local_irq_save(flags);
925
926 fixups = oldfixups = debug_objects_fixups;
927 warnings = oldwarnings = debug_objects_warnings;
928 descr_test = &descr_type_test;
929
930 debug_object_init(&obj, &descr_type_test);
931 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
932 goto out;
933 debug_object_activate(&obj, &descr_type_test);
934 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
935 goto out;
936 debug_object_activate(&obj, &descr_type_test);
937 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings))
938 goto out;
939 debug_object_deactivate(&obj, &descr_type_test);
940 if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings))
941 goto out;
942 debug_object_destroy(&obj, &descr_type_test);
943 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings))
944 goto out;
945 debug_object_init(&obj, &descr_type_test);
946 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
947 goto out;
948 debug_object_activate(&obj, &descr_type_test);
949 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
950 goto out;
951 debug_object_deactivate(&obj, &descr_type_test);
952 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
953 goto out;
954 debug_object_free(&obj, &descr_type_test);
955 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
956 goto out;
957
958 obj.static_init = 1;
959 debug_object_activate(&obj, &descr_type_test);
Stephen Boyd9f78ff02012-03-05 14:59:17 -0800960 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700961 goto out;
962 debug_object_init(&obj, &descr_type_test);
963 if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings))
964 goto out;
965 debug_object_free(&obj, &descr_type_test);
966 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
967 goto out;
968
969#ifdef CONFIG_DEBUG_OBJECTS_FREE
970 debug_object_init(&obj, &descr_type_test);
971 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
972 goto out;
973 debug_object_activate(&obj, &descr_type_test);
974 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
975 goto out;
976 __debug_check_no_obj_freed(&obj, sizeof(obj));
977 if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings))
978 goto out;
979#endif
980 printk(KERN_INFO "ODEBUG: selftest passed\n");
981
982out:
983 debug_objects_fixups = oldfixups;
984 debug_objects_warnings = oldwarnings;
985 descr_test = NULL;
986
987 local_irq_restore(flags);
988}
989#else
990static inline void debug_objects_selftest(void) { }
991#endif
992
993/*
994 * Called during early boot to initialize the hash buckets and link
995 * the static object pool objects into the poll list. After this call
996 * the object tracker is fully operational.
997 */
998void __init debug_objects_early_init(void)
999{
1000 int i;
1001
1002 for (i = 0; i < ODEBUG_HASH_SIZE; i++)
Thomas Gleixneraef9cb02009-11-17 18:11:28 +01001003 raw_spin_lock_init(&obj_hash[i].lock);
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -07001004
1005 for (i = 0; i < ODEBUG_POOL_SIZE; i++)
1006 hlist_add_head(&obj_static_pool[i].node, &obj_pool);
1007}
1008
1009/*
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001010 * Convert the statically allocated objects to dynamic ones:
1011 */
Henrik Kretzschmar1fb2f772010-03-26 20:38:35 +01001012static int __init debug_objects_replace_static_objects(void)
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001013{
1014 struct debug_bucket *db = obj_hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001015 struct hlist_node *tmp;
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001016 struct debug_obj *obj, *new;
1017 HLIST_HEAD(objects);
1018 int i, cnt = 0;
1019
1020 for (i = 0; i < ODEBUG_POOL_SIZE; i++) {
1021 obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL);
1022 if (!obj)
1023 goto free;
1024 hlist_add_head(&obj->node, &objects);
1025 }
1026
1027 /*
1028 * When debug_objects_mem_init() is called we know that only
1029 * one CPU is up, so disabling interrupts is enough
1030 * protection. This avoids the lockdep hell of lock ordering.
1031 */
1032 local_irq_disable();
1033
1034 /* Remove the statically allocated objects from the pool */
Sasha Levinb67bfe02013-02-27 17:06:00 -08001035 hlist_for_each_entry_safe(obj, tmp, &obj_pool, node)
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001036 hlist_del(&obj->node);
1037 /* Move the allocated objects to the pool */
1038 hlist_move_list(&objects, &obj_pool);
1039
1040 /* Replace the active object references */
1041 for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
1042 hlist_move_list(&db->list, &objects);
1043
Sasha Levinb67bfe02013-02-27 17:06:00 -08001044 hlist_for_each_entry(obj, &objects, node) {
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001045 new = hlist_entry(obj_pool.first, typeof(*obj), node);
1046 hlist_del(&new->node);
1047 /* copy object data */
1048 *new = *obj;
1049 hlist_add_head(&new->node, &db->list);
1050 cnt++;
1051 }
1052 }
Thomas Gleixner765a5e02012-04-11 11:54:27 +02001053 local_irq_enable();
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001054
1055 printk(KERN_DEBUG "ODEBUG: %d of %d active objects replaced\n", cnt,
1056 obj_pool_used);
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001057 return 0;
1058free:
Sasha Levinb67bfe02013-02-27 17:06:00 -08001059 hlist_for_each_entry_safe(obj, tmp, &objects, node) {
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001060 hlist_del(&obj->node);
1061 kmem_cache_free(obj_cache, obj);
1062 }
1063 return -ENOMEM;
1064}
1065
1066/*
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -07001067 * Called after the kmem_caches are functional to setup a dedicated
1068 * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag
1069 * prevents that the debug code is called on kmem_cache_free() for the
1070 * debug tracker objects to avoid recursive calls.
1071 */
1072void __init debug_objects_mem_init(void)
1073{
1074 if (!debug_objects_enabled)
1075 return;
1076
1077 obj_cache = kmem_cache_create("debug_objects_cache",
1078 sizeof (struct debug_obj), 0,
1079 SLAB_DEBUG_OBJECTS, NULL);
1080
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001081 if (!obj_cache || debug_objects_replace_static_objects()) {
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -07001082 debug_objects_enabled = 0;
Thomas Gleixner1be1cb72009-03-16 18:53:18 +01001083 if (obj_cache)
1084 kmem_cache_destroy(obj_cache);
1085 printk(KERN_WARNING "ODEBUG: out of memory.\n");
1086 } else
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -07001087 debug_objects_selftest();
1088}