projects/linux·blob v2.6.26-rc7 · refs

890 lines · 21.0 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
72 if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL))
73 return obj_pool_free;
74
75 if (unlikely(!obj_cache))
76 return obj_pool_free;
77
78 while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) {
79
80 new = kmem_cache_zalloc(obj_cache, gfp);
81 if (!new)
82 return obj_pool_free;
83
84 spin_lock(&pool_lock);
85 hlist_add_head(&new->node, &obj_pool);
86 obj_pool_free++;
87 spin_unlock(&pool_lock);
88 }
89 return obj_pool_free;
90}
91
92/*
93 * Lookup an object in the hash bucket.
94 */
95static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b)
96{
97 struct hlist_node *node;
98 struct debug_obj *obj;
99 int cnt = 0;
100
101 hlist_for_each_entry(obj, node, &b->list, node) {
102 cnt++;
103 if (obj->object == addr)
104 return obj;
105 }
106 if (cnt > debug_objects_maxchain)
107 debug_objects_maxchain = cnt;
108
109 return NULL;
110}
111
112/*
113 * Allocate a new object. If the pool is empty and no refill possible,
114 * 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 int retry = 0;
121
122repeat:
123 spin_lock(&pool_lock);
124 if (obj_pool.first) {
125 obj = hlist_entry(obj_pool.first, typeof(*obj), node);
126
127 obj->object = addr;
128 obj->descr = descr;
129 obj->state = ODEBUG_STATE_NONE;
130 hlist_del(&obj->node);
131
132 hlist_add_head(&obj->node, &b->list);
133
134 obj_pool_used++;
135 if (obj_pool_used > obj_pool_max_used)
136 obj_pool_max_used = obj_pool_used;
137
138 obj_pool_free--;
139 if (obj_pool_free < obj_pool_min_free)
140 obj_pool_min_free = obj_pool_free;
141 }
142 spin_unlock(&pool_lock);
143
144 if (fill_pool() && !obj && !retry++)
145 goto repeat;
146
147 return obj;
148}
149
150/*
151 * Put the object back into the pool or give it back to kmem_cache:
152 */
153static void free_object(struct debug_obj *obj)
154{
155 unsigned long idx = (unsigned long)(obj - obj_static_pool);
156
157 if (obj_pool_free < ODEBUG_POOL_SIZE || idx < ODEBUG_POOL_SIZE) {
158 spin_lock(&pool_lock);
159 hlist_add_head(&obj->node, &obj_pool);
160 obj_pool_free++;
161 obj_pool_used--;
162 spin_unlock(&pool_lock);
163 } else {
164 spin_lock(&pool_lock);
165 obj_pool_used--;
166 spin_unlock(&pool_lock);
167 kmem_cache_free(obj_cache, obj);
168 }
169}
170
171/*
172 * We run out of memory. That means we probably have tons of objects
173 * allocated.
174 */
175static void debug_objects_oom(void)
176{
177 struct debug_bucket *db = obj_hash;
178 struct hlist_node *node, *tmp;
179 struct debug_obj *obj;
180 unsigned long flags;
181 int i;
182
183 printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n");
184
185 for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
186 spin_lock_irqsave(&db->lock, flags);
187 hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
188 hlist_del(&obj->node);
189 free_object(obj);
190 }
191 spin_unlock_irqrestore(&db->lock, flags);
192 }
193}
194
195/*
196 * We use the pfn of the address for the hash. That way we can check
197 * for freed objects simply by checking the affected bucket.
198 */
199static struct debug_bucket *get_bucket(unsigned long addr)
200{
201 unsigned long hash;
202
203 hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS);
204 return &obj_hash[hash];
205}
206
207static void debug_print_object(struct debug_obj *obj, char *msg)
208{
209 static int limit;
210
211 if (limit < 5 && obj->descr != descr_test) {
212 limit++;
213 printk(KERN_ERR "ODEBUG: %s %s object type: %s\n", msg,
214 obj_states[obj->state], obj->descr->name);
215 WARN_ON(1);
216 }
217 debug_objects_warnings++;
218}
219
220/*
221 * Try to repair the damage, so we have a better chance to get useful
222 * debug output.
223 */
224static void
225debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
226 void * addr, enum debug_obj_state state)
227{
228 if (fixup)
229 debug_objects_fixups += fixup(addr, state);
230}
231
232static void debug_object_is_on_stack(void *addr, int onstack)
233{
234 void *stack = current->stack;
235 int is_on_stack;
236 static int limit;
237
238 if (limit > 4)
239 return;
240
241 is_on_stack = (addr >= stack && addr < (stack + THREAD_SIZE));
242
243 if (is_on_stack == onstack)
244 return;
245
246 limit++;
247 if (is_on_stack)
248 printk(KERN_WARNING
249 "ODEBUG: object is on stack, but not annotated\n");
250 else
251 printk(KERN_WARNING
252 "ODEBUG: object is not on stack, but annotated\n");
253 WARN_ON(1);
254}
255
256static void
257__debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
258{
259 enum debug_obj_state state;
260 struct debug_bucket *db;
261 struct debug_obj *obj;
262 unsigned long flags;
263
264 db = get_bucket((unsigned long) addr);
265
266 spin_lock_irqsave(&db->lock, flags);
267
268 obj = lookup_object(addr, db);
269 if (!obj) {
270 obj = alloc_object(addr, db, descr);
271 if (!obj) {
272 debug_objects_enabled = 0;
273 spin_unlock_irqrestore(&db->lock, flags);
274 debug_objects_oom();
275 return;
276 }
277 debug_object_is_on_stack(addr, onstack);
278 }
279
280 switch (obj->state) {
281 case ODEBUG_STATE_NONE:
282 case ODEBUG_STATE_INIT:
283 case ODEBUG_STATE_INACTIVE:
284 obj->state = ODEBUG_STATE_INIT;
285 break;
286
287 case ODEBUG_STATE_ACTIVE:
288 debug_print_object(obj, "init");
289 state = obj->state;
290 spin_unlock_irqrestore(&db->lock, flags);
291 debug_object_fixup(descr->fixup_init, addr, state);
292 return;
293
294 case ODEBUG_STATE_DESTROYED:
295 debug_print_object(obj, "init");
296 break;
297 default:
298 break;
299 }
300
301 spin_unlock_irqrestore(&db->lock, flags);
302}
303
304/**
305 * debug_object_init - debug checks when an object is initialized
306 * @addr: address of the object
307 * @descr: pointer to an object specific debug description structure
308 */
309void debug_object_init(void *addr, struct debug_obj_descr *descr)
310{
311 if (!debug_objects_enabled)
312 return;
313
314 __debug_object_init(addr, descr, 0);
315}
316
317/**
318 * debug_object_init_on_stack - debug checks when an object on stack is
319 * initialized
320 * @addr: address of the object
321 * @descr: pointer to an object specific debug description structure
322 */
323void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr)
324{
325 if (!debug_objects_enabled)
326 return;
327
328 __debug_object_init(addr, descr, 1);
329}
330
331/**
332 * debug_object_activate - debug checks when an object is activated
333 * @addr: address of the object
334 * @descr: pointer to an object specific debug description structure
335 */
336void debug_object_activate(void *addr, struct debug_obj_descr *descr)
337{
338 enum debug_obj_state state;
339 struct debug_bucket *db;
340 struct debug_obj *obj;
341 unsigned long flags;
342
343 if (!debug_objects_enabled)
344 return;
345
346 db = get_bucket((unsigned long) addr);
347
348 spin_lock_irqsave(&db->lock, flags);
349
350 obj = lookup_object(addr, db);
351 if (obj) {
352 switch (obj->state) {
353 case ODEBUG_STATE_INIT:
354 case ODEBUG_STATE_INACTIVE:
355 obj->state = ODEBUG_STATE_ACTIVE;
356 break;
357
358 case ODEBUG_STATE_ACTIVE:
359 debug_print_object(obj, "activate");
360 state = obj->state;
361 spin_unlock_irqrestore(&db->lock, flags);
362 debug_object_fixup(descr->fixup_activate, addr, state);
363 return;
364
365 case ODEBUG_STATE_DESTROYED:
366 debug_print_object(obj, "activate");
367 break;
368 default:
369 break;
370 }
371 spin_unlock_irqrestore(&db->lock, flags);
372 return;
373 }
374
375 spin_unlock_irqrestore(&db->lock, flags);
376 /*
377 * This happens when a static object is activated. We
378 * let the type specific code decide whether this is
379 * true or not.
380 */
381 debug_object_fixup(descr->fixup_activate, addr,
382 ODEBUG_STATE_NOTAVAILABLE);
383}
384
385/**
386 * debug_object_deactivate - debug checks when an object is deactivated
387 * @addr: address of the object
388 * @descr: pointer to an object specific debug description structure
389 */
390void debug_object_deactivate(void *addr, struct debug_obj_descr *descr)
391{
392 struct debug_bucket *db;
393 struct debug_obj *obj;
394 unsigned long flags;
395
396 if (!debug_objects_enabled)
397 return;
398
399 db = get_bucket((unsigned long) addr);
400
401 spin_lock_irqsave(&db->lock, flags);
402
403 obj = lookup_object(addr, db);
404 if (obj) {
405 switch (obj->state) {
406 case ODEBUG_STATE_INIT:
407 case ODEBUG_STATE_INACTIVE:
408 case ODEBUG_STATE_ACTIVE:
409 obj->state = ODEBUG_STATE_INACTIVE;
410 break;
411
412 case ODEBUG_STATE_DESTROYED:
413 debug_print_object(obj, "deactivate");
414 break;
415 default:
416 break;
417 }
418 } else {
419 struct debug_obj o = { .object = addr,
420 .state = ODEBUG_STATE_NOTAVAILABLE,
421 .descr = descr };
422
423 debug_print_object(&o, "deactivate");
424 }
425
426 spin_unlock_irqrestore(&db->lock, flags);
427}
428
429/**
430 * debug_object_destroy - debug checks when an object is destroyed
431 * @addr: address of the object
432 * @descr: pointer to an object specific debug description structure
433 */
434void debug_object_destroy(void *addr, struct debug_obj_descr *descr)
435{
436 enum debug_obj_state state;
437 struct debug_bucket *db;
438 struct debug_obj *obj;
439 unsigned long flags;
440
441 if (!debug_objects_enabled)
442 return;
443
444 db = get_bucket((unsigned long) addr);
445
446 spin_lock_irqsave(&db->lock, flags);
447
448 obj = lookup_object(addr, db);
449 if (!obj)
450 goto out_unlock;
451
452 switch (obj->state) {
453 case ODEBUG_STATE_NONE:
454 case ODEBUG_STATE_INIT:
455 case ODEBUG_STATE_INACTIVE:
456 obj->state = ODEBUG_STATE_DESTROYED;
457 break;
458 case ODEBUG_STATE_ACTIVE:
459 debug_print_object(obj, "destroy");
460 state = obj->state;
461 spin_unlock_irqrestore(&db->lock, flags);
462 debug_object_fixup(descr->fixup_destroy, addr, state);
463 return;
464
465 case ODEBUG_STATE_DESTROYED:
466 debug_print_object(obj, "destroy");
467 break;
468 default:
469 break;
470 }
471out_unlock:
472 spin_unlock_irqrestore(&db->lock, flags);
473}
474
475/**
476 * debug_object_free - debug checks when an object is freed
477 * @addr: address of the object
478 * @descr: pointer to an object specific debug description structure
479 */
480void debug_object_free(void *addr, struct debug_obj_descr *descr)
481{
482 enum debug_obj_state state;
483 struct debug_bucket *db;
484 struct debug_obj *obj;
485 unsigned long flags;
486
487 if (!debug_objects_enabled)
488 return;
489
490 db = get_bucket((unsigned long) addr);
491
492 spin_lock_irqsave(&db->lock, flags);
493
494 obj = lookup_object(addr, db);
495 if (!obj)
496 goto out_unlock;
497
498 switch (obj->state) {
499 case ODEBUG_STATE_ACTIVE:
500 debug_print_object(obj, "free");
501 state = obj->state;
502 spin_unlock_irqrestore(&db->lock, flags);
503 debug_object_fixup(descr->fixup_free, addr, state);
504 return;
505 default:
506 hlist_del(&obj->node);
507 free_object(obj);
508 break;
509 }
510out_unlock:
511 spin_unlock_irqrestore(&db->lock, flags);
512}
513
514#ifdef CONFIG_DEBUG_OBJECTS_FREE
515static void __debug_check_no_obj_freed(const void *address, unsigned long size)
516{
517 unsigned long flags, oaddr, saddr, eaddr, paddr, chunks;
518 struct hlist_node *node, *tmp;
519 struct debug_obj_descr *descr;
520 enum debug_obj_state state;
521 struct debug_bucket *db;
522 struct debug_obj *obj;
523 int cnt;
524
525 saddr = (unsigned long) address;
526 eaddr = saddr + size;
527 paddr = saddr & ODEBUG_CHUNK_MASK;
528 chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1));
529 chunks >>= ODEBUG_CHUNK_SHIFT;
530
531 for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) {
532 db = get_bucket(paddr);
533
534repeat:
535 cnt = 0;
536 spin_lock_irqsave(&db->lock, flags);
537 hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
538 cnt++;
539 oaddr = (unsigned long) obj->object;
540 if (oaddr < saddr || oaddr >= eaddr)
541 continue;
542
543 switch (obj->state) {
544 case ODEBUG_STATE_ACTIVE:
545 debug_print_object(obj, "free");
546 descr = obj->descr;
547 state = obj->state;
548 spin_unlock_irqrestore(&db->lock, flags);
549 debug_object_fixup(descr->fixup_free,
550 (void *) oaddr, state);
551 goto repeat;
552 default:
553 hlist_del(&obj->node);
554 free_object(obj);
555 break;
556 }
557 }
558 spin_unlock_irqrestore(&db->lock, flags);
559 if (cnt > debug_objects_maxchain)
560 debug_objects_maxchain = cnt;
561 }
562}
563
564void debug_check_no_obj_freed(const void *address, unsigned long size)
565{
566 if (debug_objects_enabled)
567 __debug_check_no_obj_freed(address, size);
568}
569#endif
570
571#ifdef CONFIG_DEBUG_FS
572
573static int debug_stats_show(struct seq_file *m, void *v)
574{
575 seq_printf(m, "max_chain :%d\n", debug_objects_maxchain);
576 seq_printf(m, "warnings :%d\n", debug_objects_warnings);
577 seq_printf(m, "fixups :%d\n", debug_objects_fixups);
578 seq_printf(m, "pool_free :%d\n", obj_pool_free);
579 seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
580 seq_printf(m, "pool_used :%d\n", obj_pool_used);
581 seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
582 return 0;
583}
584
585static int debug_stats_open(struct inode *inode, struct file *filp)
586{
587 return single_open(filp, debug_stats_show, NULL);
588}
589
590static const struct file_operations debug_stats_fops = {
591 .open = debug_stats_open,
592 .read = seq_read,
593 .llseek = seq_lseek,
594 .release = single_release,
595};
596
597static int __init debug_objects_init_debugfs(void)
598{
599 struct dentry *dbgdir, *dbgstats;
600
601 if (!debug_objects_enabled)
602 return 0;
603
604 dbgdir = debugfs_create_dir("debug_objects", NULL);
605 if (!dbgdir)
606 return -ENOMEM;
607
608 dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL,
609 &debug_stats_fops);
610 if (!dbgstats)
611 goto err;
612
613 return 0;
614
615err:
616 debugfs_remove(dbgdir);
617
618 return -ENOMEM;
619}
620__initcall(debug_objects_init_debugfs);
621
622#else
623static inline void debug_objects_init_debugfs(void) { }
624#endif
625
626#ifdef CONFIG_DEBUG_OBJECTS_SELFTEST
627
628/* Random data structure for the self test */
629struct self_test {
630 unsigned long dummy1[6];
631 int static_init;
632 unsigned long dummy2[3];
633};
634
635static __initdata struct debug_obj_descr descr_type_test;
636
637/*
638 * fixup_init is called when:
639 * - an active object is initialized
640 */
641static int __init fixup_init(void *addr, enum debug_obj_state state)
642{
643 struct self_test *obj = addr;
644
645 switch (state) {
646 case ODEBUG_STATE_ACTIVE:
647 debug_object_deactivate(obj, &descr_type_test);
648 debug_object_init(obj, &descr_type_test);
649 return 1;
650 default:
651 return 0;
652 }
653}
654
655/*
656 * fixup_activate is called when:
657 * - an active object is activated
658 * - an unknown object is activated (might be a statically initialized object)
659 */
660static int __init fixup_activate(void *addr, enum debug_obj_state state)
661{
662 struct self_test *obj = addr;
663
664 switch (state) {
665 case ODEBUG_STATE_NOTAVAILABLE:
666 if (obj->static_init == 1) {
667 debug_object_init(obj, &descr_type_test);
668 debug_object_activate(obj, &descr_type_test);
669 /*
670 * Real code should return 0 here ! This is
671 * not a fixup of some bad behaviour. We
672 * merily call the debug_init function to keep
673 * track of the object.
674 */
675 return 1;
676 } else {
677 /* Real code needs to emit a warning here */
678 }
679 return 0;
680
681 case ODEBUG_STATE_ACTIVE:
682 debug_object_deactivate(obj, &descr_type_test);
683 debug_object_activate(obj, &descr_type_test);
684 return 1;
685
686 default:
687 return 0;
688 }
689}
690
691/*
692 * fixup_destroy is called when:
693 * - an active object is destroyed
694 */
695static int __init fixup_destroy(void *addr, enum debug_obj_state state)
696{
697 struct self_test *obj = addr;
698
699 switch (state) {
700 case ODEBUG_STATE_ACTIVE:
701 debug_object_deactivate(obj, &descr_type_test);
702 debug_object_destroy(obj, &descr_type_test);
703 return 1;
704 default:
705 return 0;
706 }
707}
708
709/*
710 * fixup_free is called when:
711 * - an active object is freed
712 */
713static int __init fixup_free(void *addr, enum debug_obj_state state)
714{
715 struct self_test *obj = addr;
716
717 switch (state) {
718 case ODEBUG_STATE_ACTIVE:
719 debug_object_deactivate(obj, &descr_type_test);
720 debug_object_free(obj, &descr_type_test);
721 return 1;
722 default:
723 return 0;
724 }
725}
726
727static int
728check_results(void *addr, enum debug_obj_state state, int fixups, int warnings)
729{
730 struct debug_bucket *db;
731 struct debug_obj *obj;
732 unsigned long flags;
733 int res = -EINVAL;
734
735 db = get_bucket((unsigned long) addr);
736
737 spin_lock_irqsave(&db->lock, flags);
738
739 obj = lookup_object(addr, db);
740 if (!obj && state != ODEBUG_STATE_NONE) {
741 printk(KERN_ERR "ODEBUG: selftest object not found\n");
742 WARN_ON(1);
743 goto out;
744 }
745 if (obj && obj->state != state) {
746 printk(KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n",
747 obj->state, state);
748 WARN_ON(1);
749 goto out;
750 }
751 if (fixups != debug_objects_fixups) {
752 printk(KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n",
753 fixups, debug_objects_fixups);
754 WARN_ON(1);
755 goto out;
756 }
757 if (warnings != debug_objects_warnings) {
758 printk(KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n",
759 warnings, debug_objects_warnings);
760 WARN_ON(1);
761 goto out;
762 }
763 res = 0;
764out:
765 spin_unlock_irqrestore(&db->lock, flags);
766 if (res)
767 debug_objects_enabled = 0;
768 return res;
769}
770
771static __initdata struct debug_obj_descr descr_type_test = {
772 .name = "selftest",
773 .fixup_init = fixup_init,
774 .fixup_activate = fixup_activate,
775 .fixup_destroy = fixup_destroy,
776 .fixup_free = fixup_free,
777};
778
779static __initdata struct self_test obj = { .static_init = 0 };
780
781static void __init debug_objects_selftest(void)
782{
783 int fixups, oldfixups, warnings, oldwarnings;
784 unsigned long flags;
785
786 local_irq_save(flags);
787
788 fixups = oldfixups = debug_objects_fixups;
789 warnings = oldwarnings = debug_objects_warnings;
790 descr_test = &descr_type_test;
791
792 debug_object_init(&obj, &descr_type_test);
793 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
794 goto out;
795 debug_object_activate(&obj, &descr_type_test);
796 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
797 goto out;
798 debug_object_activate(&obj, &descr_type_test);
799 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings))
800 goto out;
801 debug_object_deactivate(&obj, &descr_type_test);
802 if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings))
803 goto out;
804 debug_object_destroy(&obj, &descr_type_test);
805 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings))
806 goto out;
807 debug_object_init(&obj, &descr_type_test);
808 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
809 goto out;
810 debug_object_activate(&obj, &descr_type_test);
811 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
812 goto out;
813 debug_object_deactivate(&obj, &descr_type_test);
814 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
815 goto out;
816 debug_object_free(&obj, &descr_type_test);
817 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
818 goto out;
819
820 obj.static_init = 1;
821 debug_object_activate(&obj, &descr_type_test);
822 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, warnings))
823 goto out;
824 debug_object_init(&obj, &descr_type_test);
825 if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings))
826 goto out;
827 debug_object_free(&obj, &descr_type_test);
828 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
829 goto out;
830
831#ifdef CONFIG_DEBUG_OBJECTS_FREE
832 debug_object_init(&obj, &descr_type_test);
833 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
834 goto out;
835 debug_object_activate(&obj, &descr_type_test);
836 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
837 goto out;
838 __debug_check_no_obj_freed(&obj, sizeof(obj));
839 if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings))
840 goto out;
841#endif
842 printk(KERN_INFO "ODEBUG: selftest passed\n");
843
844out:
845 debug_objects_fixups = oldfixups;
846 debug_objects_warnings = oldwarnings;
847 descr_test = NULL;
848
849 local_irq_restore(flags);
850}
851#else
852static inline void debug_objects_selftest(void) { }
853#endif
854
855/*
856 * Called during early boot to initialize the hash buckets and link
857 * the static object pool objects into the poll list. After this call
858 * the object tracker is fully operational.
859 */
860void __init debug_objects_early_init(void)
861{
862 int i;
863
864 for (i = 0; i < ODEBUG_HASH_SIZE; i++)
865 spin_lock_init(&obj_hash[i].lock);
866
867 for (i = 0; i < ODEBUG_POOL_SIZE; i++)
868 hlist_add_head(&obj_static_pool[i].node, &obj_pool);
869}
870
871/*
872 * Called after the kmem_caches are functional to setup a dedicated
873 * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag
874 * prevents that the debug code is called on kmem_cache_free() for the
875 * debug tracker objects to avoid recursive calls.
876 */
877void __init debug_objects_mem_init(void)
878{
879 if (!debug_objects_enabled)
880 return;
881
882 obj_cache = kmem_cache_create("debug_objects_cache",
883 sizeof (struct debug_obj), 0,
884 SLAB_DEBUG_OBJECTS, NULL);
885
886 if (!obj_cache)
887 debug_objects_enabled = 0;
888 else
889 debug_objects_selftest();
890}