projects/linux·blob v2.6.27-rc4 · refs

880 lines · 20.9 KiB

1/*
2 * Generic infrastructure for lifetime debugging of objects.
3 *
4 * Started by Thomas Gleixner
5 *
6 * Copyright (C) 2008, Thomas Gleixner <[email protected]>
7 *
8 * For licencing details see kernel-base/COPYING
9 */
10#include <linux/debugobjects.h>
11#include <linux/interrupt.h>
12#include <linux/seq_file.h>
13#include <linux/debugfs.h>
14#include <linux/hash.h>
15
16#define ODEBUG_HASH_BITS 14
17#define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS)
18
19#define ODEBUG_POOL_SIZE 512
20#define ODEBUG_POOL_MIN_LEVEL 256
21
22#define ODEBUG_CHUNK_SHIFT PAGE_SHIFT
23#define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT)
24#define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1))
25
26struct debug_bucket {
27 struct hlist_head list;
28 spinlock_t lock;
29};
30
31static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE];
32
33static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE];
34
35static DEFINE_SPINLOCK(pool_lock);
36
37static HLIST_HEAD(obj_pool);
38
39static int obj_pool_min_free = ODEBUG_POOL_SIZE;
40static int obj_pool_free = ODEBUG_POOL_SIZE;
41static int obj_pool_used;
42static int obj_pool_max_used;
43static struct kmem_cache *obj_cache;
44
45static int debug_objects_maxchain __read_mostly;
46static int debug_objects_fixups __read_mostly;
47static int debug_objects_warnings __read_mostly;
48static int debug_objects_enabled __read_mostly;
49static struct debug_obj_descr *descr_test __read_mostly;
50
51static int __init enable_object_debug(char *str)
52{
53 debug_objects_enabled = 1;
54 return 0;
55}
56early_param("debug_objects", enable_object_debug);
57
58static const char *obj_states[ODEBUG_STATE_MAX] = {
59 [ODEBUG_STATE_NONE] = "none",
60 [ODEBUG_STATE_INIT] = "initialized",
61 [ODEBUG_STATE_INACTIVE] = "inactive",
62 [ODEBUG_STATE_ACTIVE] = "active",
63 [ODEBUG_STATE_DESTROYED] = "destroyed",
64 [ODEBUG_STATE_NOTAVAILABLE] = "not available",
65};
66
67static int fill_pool(void)
68{
69 gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN;
70 struct debug_obj *new;
71 unsigned long flags;
72
73 if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL))
74 return obj_pool_free;
75
76 if (unlikely(!obj_cache))
77 return obj_pool_free;
78
79 while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) {
80
81 new = kmem_cache_zalloc(obj_cache, gfp);
82 if (!new)
83 return obj_pool_free;
84
85 spin_lock_irqsave(&pool_lock, flags);
86 hlist_add_head(&new->node, &obj_pool);
87 obj_pool_free++;
88 spin_unlock_irqrestore(&pool_lock, flags);
89 }
90 return obj_pool_free;
91}
92
93/*
94 * Lookup an object in the hash bucket.
95 */
96static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b)
97{
98 struct hlist_node *node;
99 struct debug_obj *obj;
100 int cnt = 0;
101
102 hlist_for_each_entry(obj, node, &b->list, node) {
103 cnt++;
104 if (obj->object == addr)
105 return obj;
106 }
107 if (cnt > debug_objects_maxchain)
108 debug_objects_maxchain = cnt;
109
110 return NULL;
111}
112
113/*
114 * Allocate a new object. If the pool is empty, switch off the debugger.
115 */
116static struct debug_obj *
117alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr)
118{
119 struct debug_obj *obj = NULL;
120
121 spin_lock(&pool_lock);
122 if (obj_pool.first) {
123 obj = hlist_entry(obj_pool.first, typeof(*obj), node);
124
125 obj->object = addr;
126 obj->descr = descr;
127 obj->state = ODEBUG_STATE_NONE;
128 hlist_del(&obj->node);
129
130 hlist_add_head(&obj->node, &b->list);
131
132 obj_pool_used++;
133 if (obj_pool_used > obj_pool_max_used)
134 obj_pool_max_used = obj_pool_used;
135
136 obj_pool_free--;
137 if (obj_pool_free < obj_pool_min_free)
138 obj_pool_min_free = obj_pool_free;
139 }
140 spin_unlock(&pool_lock);
141
142 return obj;
143}
144
145/*
146 * Put the object back into the pool or give it back to kmem_cache:
147 */
148static void free_object(struct debug_obj *obj)
149{
150 unsigned long idx = (unsigned long)(obj - obj_static_pool);
151
152 if (obj_pool_free < ODEBUG_POOL_SIZE || idx < ODEBUG_POOL_SIZE) {
153 spin_lock(&pool_lock);
154 hlist_add_head(&obj->node, &obj_pool);
155 obj_pool_free++;
156 obj_pool_used--;
157 spin_unlock(&pool_lock);
158 } else {
159 spin_lock(&pool_lock);
160 obj_pool_used--;
161 spin_unlock(&pool_lock);
162 kmem_cache_free(obj_cache, obj);
163 }
164}
165
166/*
167 * We run out of memory. That means we probably have tons of objects
168 * allocated.
169 */
170static void debug_objects_oom(void)
171{
172 struct debug_bucket *db = obj_hash;
173 struct hlist_node *node, *tmp;
174 struct debug_obj *obj;
175 unsigned long flags;
176 int i;
177
178 printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n");
179
180 for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
181 spin_lock_irqsave(&db->lock, flags);
182 hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
183 hlist_del(&obj->node);
184 free_object(obj);
185 }
186 spin_unlock_irqrestore(&db->lock, flags);
187 }
188}
189
190/*
191 * We use the pfn of the address for the hash. That way we can check
192 * for freed objects simply by checking the affected bucket.
193 */
194static struct debug_bucket *get_bucket(unsigned long addr)
195{
196 unsigned long hash;
197
198 hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS);
199 return &obj_hash[hash];
200}
201
202static void debug_print_object(struct debug_obj *obj, char *msg)
203{
204 static int limit;
205
206 if (limit < 5 && obj->descr != descr_test) {
207 limit++;
208 WARN(1, KERN_ERR "ODEBUG: %s %s object type: %s\n", msg,
209 obj_states[obj->state], obj->descr->name);
210 }
211 debug_objects_warnings++;
212}
213
214/*
215 * Try to repair the damage, so we have a better chance to get useful
216 * debug output.
217 */
218static void
219debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
220 void * addr, enum debug_obj_state state)
221{
222 if (fixup)
223 debug_objects_fixups += fixup(addr, state);
224}
225
226static void debug_object_is_on_stack(void *addr, int onstack)
227{
228 int is_on_stack;
229 static int limit;
230
231 if (limit > 4)
232 return;
233
234 is_on_stack = object_is_on_stack(addr);
235 if (is_on_stack == onstack)
236 return;
237
238 limit++;
239 if (is_on_stack)
240 printk(KERN_WARNING
241 "ODEBUG: object is on stack, but not annotated\n");
242 else
243 printk(KERN_WARNING
244 "ODEBUG: object is not on stack, but annotated\n");
245 WARN_ON(1);
246}
247
248static void
249__debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
250{
251 enum debug_obj_state state;
252 struct debug_bucket *db;
253 struct debug_obj *obj;
254 unsigned long flags;
255
256 fill_pool();
257
258 db = get_bucket((unsigned long) addr);
259
260 spin_lock_irqsave(&db->lock, flags);
261
262 obj = lookup_object(addr, db);
263 if (!obj) {
264 obj = alloc_object(addr, db, descr);
265 if (!obj) {
266 debug_objects_enabled = 0;
267 spin_unlock_irqrestore(&db->lock, flags);
268 debug_objects_oom();
269 return;
270 }
271 debug_object_is_on_stack(addr, onstack);
272 }
273
274 switch (obj->state) {
275 case ODEBUG_STATE_NONE:
276 case ODEBUG_STATE_INIT:
277 case ODEBUG_STATE_INACTIVE:
278 obj->state = ODEBUG_STATE_INIT;
279 break;
280
281 case ODEBUG_STATE_ACTIVE:
282 debug_print_object(obj, "init");
283 state = obj->state;
284 spin_unlock_irqrestore(&db->lock, flags);
285 debug_object_fixup(descr->fixup_init, addr, state);
286 return;
287
288 case ODEBUG_STATE_DESTROYED:
289 debug_print_object(obj, "init");
290 break;
291 default:
292 break;
293 }
294
295 spin_unlock_irqrestore(&db->lock, flags);
296}
297
298/**
299 * debug_object_init - debug checks when an object is initialized
300 * @addr: address of the object
301 * @descr: pointer to an object specific debug description structure
302 */
303void debug_object_init(void *addr, struct debug_obj_descr *descr)
304{
305 if (!debug_objects_enabled)
306 return;
307
308 __debug_object_init(addr, descr, 0);
309}
310
311/**
312 * debug_object_init_on_stack - debug checks when an object on stack is
313 * initialized
314 * @addr: address of the object
315 * @descr: pointer to an object specific debug description structure
316 */
317void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr)
318{
319 if (!debug_objects_enabled)
320 return;
321
322 __debug_object_init(addr, descr, 1);
323}
324
325/**
326 * debug_object_activate - debug checks when an object is activated
327 * @addr: address of the object
328 * @descr: pointer to an object specific debug description structure
329 */
330void debug_object_activate(void *addr, struct debug_obj_descr *descr)
331{
332 enum debug_obj_state state;
333 struct debug_bucket *db;
334 struct debug_obj *obj;
335 unsigned long flags;
336
337 if (!debug_objects_enabled)
338 return;
339
340 db = get_bucket((unsigned long) addr);
341
342 spin_lock_irqsave(&db->lock, flags);
343
344 obj = lookup_object(addr, db);
345 if (obj) {
346 switch (obj->state) {
347 case ODEBUG_STATE_INIT:
348 case ODEBUG_STATE_INACTIVE:
349 obj->state = ODEBUG_STATE_ACTIVE;
350 break;
351
352 case ODEBUG_STATE_ACTIVE:
353 debug_print_object(obj, "activate");
354 state = obj->state;
355 spin_unlock_irqrestore(&db->lock, flags);
356 debug_object_fixup(descr->fixup_activate, addr, state);
357 return;
358
359 case ODEBUG_STATE_DESTROYED:
360 debug_print_object(obj, "activate");
361 break;
362 default:
363 break;
364 }
365 spin_unlock_irqrestore(&db->lock, flags);
366 return;
367 }
368
369 spin_unlock_irqrestore(&db->lock, flags);
370 /*
371 * This happens when a static object is activated. We
372 * let the type specific code decide whether this is
373 * true or not.
374 */
375 debug_object_fixup(descr->fixup_activate, addr,
376 ODEBUG_STATE_NOTAVAILABLE);
377}
378
379/**
380 * debug_object_deactivate - debug checks when an object is deactivated
381 * @addr: address of the object
382 * @descr: pointer to an object specific debug description structure
383 */
384void debug_object_deactivate(void *addr, struct debug_obj_descr *descr)
385{
386 struct debug_bucket *db;
387 struct debug_obj *obj;
388 unsigned long flags;
389
390 if (!debug_objects_enabled)
391 return;
392
393 db = get_bucket((unsigned long) addr);
394
395 spin_lock_irqsave(&db->lock, flags);
396
397 obj = lookup_object(addr, db);
398 if (obj) {
399 switch (obj->state) {
400 case ODEBUG_STATE_INIT:
401 case ODEBUG_STATE_INACTIVE:
402 case ODEBUG_STATE_ACTIVE:
403 obj->state = ODEBUG_STATE_INACTIVE;
404 break;
405
406 case ODEBUG_STATE_DESTROYED:
407 debug_print_object(obj, "deactivate");
408 break;
409 default:
410 break;
411 }
412 } else {
413 struct debug_obj o = { .object = addr,
414 .state = ODEBUG_STATE_NOTAVAILABLE,
415 .descr = descr };
416
417 debug_print_object(&o, "deactivate");
418 }
419
420 spin_unlock_irqrestore(&db->lock, flags);
421}
422
423/**
424 * debug_object_destroy - debug checks when an object is destroyed
425 * @addr: address of the object
426 * @descr: pointer to an object specific debug description structure
427 */
428void debug_object_destroy(void *addr, struct debug_obj_descr *descr)
429{
430 enum debug_obj_state state;
431 struct debug_bucket *db;
432 struct debug_obj *obj;
433 unsigned long flags;
434
435 if (!debug_objects_enabled)
436 return;
437
438 db = get_bucket((unsigned long) addr);
439
440 spin_lock_irqsave(&db->lock, flags);
441
442 obj = lookup_object(addr, db);
443 if (!obj)
444 goto out_unlock;
445
446 switch (obj->state) {
447 case ODEBUG_STATE_NONE:
448 case ODEBUG_STATE_INIT:
449 case ODEBUG_STATE_INACTIVE:
450 obj->state = ODEBUG_STATE_DESTROYED;
451 break;
452 case ODEBUG_STATE_ACTIVE:
453 debug_print_object(obj, "destroy");
454 state = obj->state;
455 spin_unlock_irqrestore(&db->lock, flags);
456 debug_object_fixup(descr->fixup_destroy, addr, state);
457 return;
458
459 case ODEBUG_STATE_DESTROYED:
460 debug_print_object(obj, "destroy");
461 break;
462 default:
463 break;
464 }
465out_unlock:
466 spin_unlock_irqrestore(&db->lock, flags);
467}
468
469/**
470 * debug_object_free - debug checks when an object is freed
471 * @addr: address of the object
472 * @descr: pointer to an object specific debug description structure
473 */
474void debug_object_free(void *addr, struct debug_obj_descr *descr)
475{
476 enum debug_obj_state state;
477 struct debug_bucket *db;
478 struct debug_obj *obj;
479 unsigned long flags;
480
481 if (!debug_objects_enabled)
482 return;
483
484 db = get_bucket((unsigned long) addr);
485
486 spin_lock_irqsave(&db->lock, flags);
487
488 obj = lookup_object(addr, db);
489 if (!obj)
490 goto out_unlock;
491
492 switch (obj->state) {
493 case ODEBUG_STATE_ACTIVE:
494 debug_print_object(obj, "free");
495 state = obj->state;
496 spin_unlock_irqrestore(&db->lock, flags);
497 debug_object_fixup(descr->fixup_free, addr, state);
498 return;
499 default:
500 hlist_del(&obj->node);
501 free_object(obj);
502 break;
503 }
504out_unlock:
505 spin_unlock_irqrestore(&db->lock, flags);
506}
507
508#ifdef CONFIG_DEBUG_OBJECTS_FREE
509static void __debug_check_no_obj_freed(const void *address, unsigned long size)
510{
511 unsigned long flags, oaddr, saddr, eaddr, paddr, chunks;
512 struct hlist_node *node, *tmp;
513 struct debug_obj_descr *descr;
514 enum debug_obj_state state;
515 struct debug_bucket *db;
516 struct debug_obj *obj;
517 int cnt;
518
519 saddr = (unsigned long) address;
520 eaddr = saddr + size;
521 paddr = saddr & ODEBUG_CHUNK_MASK;
522 chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1));
523 chunks >>= ODEBUG_CHUNK_SHIFT;
524
525 for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) {
526 db = get_bucket(paddr);
527
528repeat:
529 cnt = 0;
530 spin_lock_irqsave(&db->lock, flags);
531 hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
532 cnt++;
533 oaddr = (unsigned long) obj->object;
534 if (oaddr < saddr || oaddr >= eaddr)
535 continue;
536
537 switch (obj->state) {
538 case ODEBUG_STATE_ACTIVE:
539 debug_print_object(obj, "free");
540 descr = obj->descr;
541 state = obj->state;
542 spin_unlock_irqrestore(&db->lock, flags);
543 debug_object_fixup(descr->fixup_free,
544 (void *) oaddr, state);
545 goto repeat;
546 default:
547 hlist_del(&obj->node);
548 free_object(obj);
549 break;
550 }
551 }
552 spin_unlock_irqrestore(&db->lock, flags);
553 if (cnt > debug_objects_maxchain)
554 debug_objects_maxchain = cnt;
555 }
556}
557
558void debug_check_no_obj_freed(const void *address, unsigned long size)
559{
560 if (debug_objects_enabled)
561 __debug_check_no_obj_freed(address, size);
562}
563#endif
564
565#ifdef CONFIG_DEBUG_FS
566
567static int debug_stats_show(struct seq_file *m, void *v)
568{
569 seq_printf(m, "max_chain :%d\n", debug_objects_maxchain);
570 seq_printf(m, "warnings :%d\n", debug_objects_warnings);
571 seq_printf(m, "fixups :%d\n", debug_objects_fixups);
572 seq_printf(m, "pool_free :%d\n", obj_pool_free);
573 seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
574 seq_printf(m, "pool_used :%d\n", obj_pool_used);
575 seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
576 return 0;
577}
578
579static int debug_stats_open(struct inode *inode, struct file *filp)
580{
581 return single_open(filp, debug_stats_show, NULL);
582}
583
584static const struct file_operations debug_stats_fops = {
585 .open = debug_stats_open,
586 .read = seq_read,
587 .llseek = seq_lseek,
588 .release = single_release,
589};
590
591static int __init debug_objects_init_debugfs(void)
592{
593 struct dentry *dbgdir, *dbgstats;
594
595 if (!debug_objects_enabled)
596 return 0;
597
598 dbgdir = debugfs_create_dir("debug_objects", NULL);
599 if (!dbgdir)
600 return -ENOMEM;
601
602 dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL,
603 &debug_stats_fops);
604 if (!dbgstats)
605 goto err;
606
607 return 0;
608
609err:
610 debugfs_remove(dbgdir);
611
612 return -ENOMEM;
613}
614__initcall(debug_objects_init_debugfs);
615
616#else
617static inline void debug_objects_init_debugfs(void) { }
618#endif
619
620#ifdef CONFIG_DEBUG_OBJECTS_SELFTEST
621
622/* Random data structure for the self test */
623struct self_test {
624 unsigned long dummy1[6];
625 int static_init;
626 unsigned long dummy2[3];
627};
628
629static __initdata struct debug_obj_descr descr_type_test;
630
631/*
632 * fixup_init is called when:
633 * - an active object is initialized
634 */
635static int __init fixup_init(void *addr, enum debug_obj_state state)
636{
637 struct self_test *obj = addr;
638
639 switch (state) {
640 case ODEBUG_STATE_ACTIVE:
641 debug_object_deactivate(obj, &descr_type_test);
642 debug_object_init(obj, &descr_type_test);
643 return 1;
644 default:
645 return 0;
646 }
647}
648
649/*
650 * fixup_activate is called when:
651 * - an active object is activated
652 * - an unknown object is activated (might be a statically initialized object)
653 */
654static int __init fixup_activate(void *addr, enum debug_obj_state state)
655{
656 struct self_test *obj = addr;
657
658 switch (state) {
659 case ODEBUG_STATE_NOTAVAILABLE:
660 if (obj->static_init == 1) {
661 debug_object_init(obj, &descr_type_test);
662 debug_object_activate(obj, &descr_type_test);
663 /*
664 * Real code should return 0 here ! This is
665 * not a fixup of some bad behaviour. We
666 * merily call the debug_init function to keep
667 * track of the object.
668 */
669 return 1;
670 } else {
671 /* Real code needs to emit a warning here */
672 }
673 return 0;
674
675 case ODEBUG_STATE_ACTIVE:
676 debug_object_deactivate(obj, &descr_type_test);
677 debug_object_activate(obj, &descr_type_test);
678 return 1;
679
680 default:
681 return 0;
682 }
683}
684
685/*
686 * fixup_destroy is called when:
687 * - an active object is destroyed
688 */
689static int __init fixup_destroy(void *addr, enum debug_obj_state state)
690{
691 struct self_test *obj = addr;
692
693 switch (state) {
694 case ODEBUG_STATE_ACTIVE:
695 debug_object_deactivate(obj, &descr_type_test);
696 debug_object_destroy(obj, &descr_type_test);
697 return 1;
698 default:
699 return 0;
700 }
701}
702
703/*
704 * fixup_free is called when:
705 * - an active object is freed
706 */
707static int __init fixup_free(void *addr, enum debug_obj_state state)
708{
709 struct self_test *obj = addr;
710
711 switch (state) {
712 case ODEBUG_STATE_ACTIVE:
713 debug_object_deactivate(obj, &descr_type_test);
714 debug_object_free(obj, &descr_type_test);
715 return 1;
716 default:
717 return 0;
718 }
719}
720
721static int
722check_results(void *addr, enum debug_obj_state state, int fixups, int warnings)
723{
724 struct debug_bucket *db;
725 struct debug_obj *obj;
726 unsigned long flags;
727 int res = -EINVAL;
728
729 db = get_bucket((unsigned long) addr);
730
731 spin_lock_irqsave(&db->lock, flags);
732
733 obj = lookup_object(addr, db);
734 if (!obj && state != ODEBUG_STATE_NONE) {
735 WARN(1, KERN_ERR "ODEBUG: selftest object not found\n");
736 goto out;
737 }
738 if (obj && obj->state != state) {
739 WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n",
740 obj->state, state);
741 goto out;
742 }
743 if (fixups != debug_objects_fixups) {
744 WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n",
745 fixups, debug_objects_fixups);
746 goto out;
747 }
748 if (warnings != debug_objects_warnings) {
749 WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n",
750 warnings, debug_objects_warnings);
751 goto out;
752 }
753 res = 0;
754out:
755 spin_unlock_irqrestore(&db->lock, flags);
756 if (res)
757 debug_objects_enabled = 0;
758 return res;
759}
760
761static __initdata struct debug_obj_descr descr_type_test = {
762 .name = "selftest",
763 .fixup_init = fixup_init,
764 .fixup_activate = fixup_activate,
765 .fixup_destroy = fixup_destroy,
766 .fixup_free = fixup_free,
767};
768
769static __initdata struct self_test obj = { .static_init = 0 };
770
771static void __init debug_objects_selftest(void)
772{
773 int fixups, oldfixups, warnings, oldwarnings;
774 unsigned long flags;
775
776 local_irq_save(flags);
777
778 fixups = oldfixups = debug_objects_fixups;
779 warnings = oldwarnings = debug_objects_warnings;
780 descr_test = &descr_type_test;
781
782 debug_object_init(&obj, &descr_type_test);
783 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
784 goto out;
785 debug_object_activate(&obj, &descr_type_test);
786 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
787 goto out;
788 debug_object_activate(&obj, &descr_type_test);
789 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings))
790 goto out;
791 debug_object_deactivate(&obj, &descr_type_test);
792 if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings))
793 goto out;
794 debug_object_destroy(&obj, &descr_type_test);
795 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings))
796 goto out;
797 debug_object_init(&obj, &descr_type_test);
798 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
799 goto out;
800 debug_object_activate(&obj, &descr_type_test);
801 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
802 goto out;
803 debug_object_deactivate(&obj, &descr_type_test);
804 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
805 goto out;
806 debug_object_free(&obj, &descr_type_test);
807 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
808 goto out;
809
810 obj.static_init = 1;
811 debug_object_activate(&obj, &descr_type_test);
812 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, warnings))
813 goto out;
814 debug_object_init(&obj, &descr_type_test);
815 if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings))
816 goto out;
817 debug_object_free(&obj, &descr_type_test);
818 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
819 goto out;
820
821#ifdef CONFIG_DEBUG_OBJECTS_FREE
822 debug_object_init(&obj, &descr_type_test);
823 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
824 goto out;
825 debug_object_activate(&obj, &descr_type_test);
826 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
827 goto out;
828 __debug_check_no_obj_freed(&obj, sizeof(obj));
829 if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings))
830 goto out;
831#endif
832 printk(KERN_INFO "ODEBUG: selftest passed\n");
833
834out:
835 debug_objects_fixups = oldfixups;
836 debug_objects_warnings = oldwarnings;
837 descr_test = NULL;
838
839 local_irq_restore(flags);
840}
841#else
842static inline void debug_objects_selftest(void) { }
843#endif
844
845/*
846 * Called during early boot to initialize the hash buckets and link
847 * the static object pool objects into the poll list. After this call
848 * the object tracker is fully operational.
849 */
850void __init debug_objects_early_init(void)
851{
852 int i;
853
854 for (i = 0; i < ODEBUG_HASH_SIZE; i++)
855 spin_lock_init(&obj_hash[i].lock);
856
857 for (i = 0; i < ODEBUG_POOL_SIZE; i++)
858 hlist_add_head(&obj_static_pool[i].node, &obj_pool);
859}
860
861/*
862 * Called after the kmem_caches are functional to setup a dedicated
863 * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag
864 * prevents that the debug code is called on kmem_cache_free() for the
865 * debug tracker objects to avoid recursive calls.
866 */
867void __init debug_objects_mem_init(void)
868{
869 if (!debug_objects_enabled)
870 return;
871
872 obj_cache = kmem_cache_create("debug_objects_cache",
873 sizeof (struct debug_obj), 0,
874 SLAB_DEBUG_OBJECTS, NULL);
875
876 if (!obj_cache)
877 debug_objects_enabled = 0;
878 else
879 debug_objects_selftest();
880}