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-rw-r--r--lib/debugobjects.c887
1 files changed, 887 insertions, 0 deletions
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
new file mode 100644
index 000000000000..85b18d79be89
--- /dev/null
+++ b/lib/debugobjects.c
@@ -0,0 +1,887 @@
1/*
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>
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 printk(KERN_ERR "ODEBUG: %s %s object type: %s\n", msg,
209 obj_states[obj->state], obj->descr->name);
210 WARN_ON(1);
211 }
212 debug_objects_warnings++;
213}
214
215/*
216 * Try to repair the damage, so we have a better chance to get useful
217 * debug output.
218 */
219static void
220debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
221 void * addr, enum debug_obj_state state)
222{
223 if (fixup)
224 debug_objects_fixups += fixup(addr, state);
225}
226
227static void debug_object_is_on_stack(void *addr, int onstack)
228{
229 void *stack = current->stack;
230 int is_on_stack;
231 static int limit;
232
233 if (limit > 4)
234 return;
235
236 is_on_stack = (addr >= stack && addr < (stack + THREAD_SIZE));
237
238 if (is_on_stack == onstack)
239 return;
240
241 limit++;
242 if (is_on_stack)
243 printk(KERN_WARNING
244 "ODEBUG: object is on stack, but not annotated\n");
245 else
246 printk(KERN_WARNING
247 "ODEBUG: object is not on stack, but annotated\n");
248 WARN_ON(1);
249}
250
251static void
252__debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
253{
254 enum debug_obj_state state;
255 struct debug_bucket *db;
256 struct debug_obj *obj;
257 unsigned long flags;
258
259 fill_pool();
260
261 db = get_bucket((unsigned long) addr);
262
263 spin_lock_irqsave(&db->lock, flags);
264
265 obj = lookup_object(addr, db);
266 if (!obj) {
267 obj = alloc_object(addr, db, descr);
268 if (!obj) {
269 debug_objects_enabled = 0;
270 spin_unlock_irqrestore(&db->lock, flags);
271 debug_objects_oom();
272 return;
273 }
274 debug_object_is_on_stack(addr, onstack);
275 }
276
277 switch (obj->state) {
278 case ODEBUG_STATE_NONE:
279 case ODEBUG_STATE_INIT:
280 case ODEBUG_STATE_INACTIVE:
281 obj->state = ODEBUG_STATE_INIT;
282 break;
283
284 case ODEBUG_STATE_ACTIVE:
285 debug_print_object(obj, "init");
286 state = obj->state;
287 spin_unlock_irqrestore(&db->lock, flags);
288 debug_object_fixup(descr->fixup_init, addr, state);
289 return;
290
291 case ODEBUG_STATE_DESTROYED:
292 debug_print_object(obj, "init");
293 break;
294 default:
295 break;
296 }
297
298 spin_unlock_irqrestore(&db->lock, flags);
299}
300
301/**
302 * debug_object_init - debug checks when an object is initialized
303 * @addr: address of the object
304 * @descr: pointer to an object specific debug description structure
305 */
306void debug_object_init(void *addr, struct debug_obj_descr *descr)
307{
308 if (!debug_objects_enabled)
309 return;
310
311 __debug_object_init(addr, descr, 0);
312}
313
314/**
315 * debug_object_init_on_stack - debug checks when an object on stack is
316 * initialized
317 * @addr: address of the object
318 * @descr: pointer to an object specific debug description structure
319 */
320void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr)
321{
322 if (!debug_objects_enabled)
323 return;
324
325 __debug_object_init(addr, descr, 1);
326}
327
328/**
329 * debug_object_activate - debug checks when an object is activated
330 * @addr: address of the object
331 * @descr: pointer to an object specific debug description structure
332 */
333void debug_object_activate(void *addr, struct debug_obj_descr *descr)
334{
335 enum debug_obj_state state;
336 struct debug_bucket *db;
337 struct debug_obj *obj;
338 unsigned long flags;
339
340 if (!debug_objects_enabled)
341 return;
342
343 db = get_bucket((unsigned long) addr);
344
345 spin_lock_irqsave(&db->lock, flags);
346
347 obj = lookup_object(addr, db);
348 if (obj) {
349 switch (obj->state) {
350 case ODEBUG_STATE_INIT:
351 case ODEBUG_STATE_INACTIVE:
352 obj->state = ODEBUG_STATE_ACTIVE;
353 break;
354
355 case ODEBUG_STATE_ACTIVE:
356 debug_print_object(obj, "activate");
357 state = obj->state;
358 spin_unlock_irqrestore(&db->lock, flags);
359 debug_object_fixup(descr->fixup_activate, addr, state);
360 return;
361
362 case ODEBUG_STATE_DESTROYED:
363 debug_print_object(obj, "activate");
364 break;
365 default:
366 break;
367 }
368 spin_unlock_irqrestore(&db->lock, flags);
369 return;
370 }
371
372 spin_unlock_irqrestore(&db->lock, flags);
373 /*
374 * This happens when a static object is activated. We
375 * let the type specific code decide whether this is
376 * true or not.
377 */
378 debug_object_fixup(descr->fixup_activate, addr,
379 ODEBUG_STATE_NOTAVAILABLE);
380}
381
382/**
383 * debug_object_deactivate - debug checks when an object is deactivated
384 * @addr: address of the object
385 * @descr: pointer to an object specific debug description structure
386 */
387void debug_object_deactivate(void *addr, struct debug_obj_descr *descr)
388{
389 struct debug_bucket *db;
390 struct debug_obj *obj;
391 unsigned long flags;
392
393 if (!debug_objects_enabled)
394 return;
395
396 db = get_bucket((unsigned long) addr);
397
398 spin_lock_irqsave(&db->lock, flags);
399
400 obj = lookup_object(addr, db);
401 if (obj) {
402 switch (obj->state) {
403 case ODEBUG_STATE_INIT:
404 case ODEBUG_STATE_INACTIVE:
405 case ODEBUG_STATE_ACTIVE:
406 obj->state = ODEBUG_STATE_INACTIVE;
407 break;
408
409 case ODEBUG_STATE_DESTROYED:
410 debug_print_object(obj, "deactivate");
411 break;
412 default:
413 break;
414 }
415 } else {
416 struct debug_obj o = { .object = addr,
417 .state = ODEBUG_STATE_NOTAVAILABLE,
418 .descr = descr };
419
420 debug_print_object(&o, "deactivate");
421 }
422
423 spin_unlock_irqrestore(&db->lock, flags);
424}
425
426/**
427 * debug_object_destroy - debug checks when an object is destroyed
428 * @addr: address of the object
429 * @descr: pointer to an object specific debug description structure
430 */
431void debug_object_destroy(void *addr, struct debug_obj_descr *descr)
432{
433 enum debug_obj_state state;
434 struct debug_bucket *db;
435 struct debug_obj *obj;
436 unsigned long flags;
437
438 if (!debug_objects_enabled)
439 return;
440
441 db = get_bucket((unsigned long) addr);
442
443 spin_lock_irqsave(&db->lock, flags);
444
445 obj = lookup_object(addr, db);
446 if (!obj)
447 goto out_unlock;
448
449 switch (obj->state) {
450 case ODEBUG_STATE_NONE:
451 case ODEBUG_STATE_INIT:
452 case ODEBUG_STATE_INACTIVE:
453 obj->state = ODEBUG_STATE_DESTROYED;
454 break;
455 case ODEBUG_STATE_ACTIVE:
456 debug_print_object(obj, "destroy");
457 state = obj->state;
458 spin_unlock_irqrestore(&db->lock, flags);
459 debug_object_fixup(descr->fixup_destroy, addr, state);
460 return;
461
462 case ODEBUG_STATE_DESTROYED:
463 debug_print_object(obj, "destroy");
464 break;
465 default:
466 break;
467 }
468out_unlock:
469 spin_unlock_irqrestore(&db->lock, flags);
470}
471
472/**
473 * debug_object_free - debug checks when an object is freed
474 * @addr: address of the object
475 * @descr: pointer to an object specific debug description structure
476 */
477void debug_object_free(void *addr, struct debug_obj_descr *descr)
478{
479 enum debug_obj_state state;
480 struct debug_bucket *db;
481 struct debug_obj *obj;
482 unsigned long flags;
483
484 if (!debug_objects_enabled)
485 return;
486
487 db = get_bucket((unsigned long) addr);
488
489 spin_lock_irqsave(&db->lock, flags);
490
491 obj = lookup_object(addr, db);
492 if (!obj)
493 goto out_unlock;
494
495 switch (obj->state) {
496 case ODEBUG_STATE_ACTIVE:
497 debug_print_object(obj, "free");
498 state = obj->state;
499 spin_unlock_irqrestore(&db->lock, flags);
500 debug_object_fixup(descr->fixup_free, addr, state);
501 return;
502 default:
503 hlist_del(&obj->node);
504 free_object(obj);
505 break;
506 }
507out_unlock:
508 spin_unlock_irqrestore(&db->lock, flags);
509}
510
511#ifdef CONFIG_DEBUG_OBJECTS_FREE
512static void __debug_check_no_obj_freed(const void *address, unsigned long size)
513{
514 unsigned long flags, oaddr, saddr, eaddr, paddr, chunks;
515 struct hlist_node *node, *tmp;
516 struct debug_obj_descr *descr;
517 enum debug_obj_state state;
518 struct debug_bucket *db;
519 struct debug_obj *obj;
520 int cnt;
521
522 saddr = (unsigned long) address;
523 eaddr = saddr + size;
524 paddr = saddr & ODEBUG_CHUNK_MASK;
525 chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1));
526 chunks >>= ODEBUG_CHUNK_SHIFT;
527
528 for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) {
529 db = get_bucket(paddr);
530
531repeat:
532 cnt = 0;
533 spin_lock_irqsave(&db->lock, flags);
534 hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
535 cnt++;
536 oaddr = (unsigned long) obj->object;
537 if (oaddr < saddr || oaddr >= eaddr)
538 continue;
539
540 switch (obj->state) {
541 case ODEBUG_STATE_ACTIVE:
542 debug_print_object(obj, "free");
543 descr = obj->descr;
544 state = obj->state;
545 spin_unlock_irqrestore(&db->lock, flags);
546 debug_object_fixup(descr->fixup_free,
547 (void *) oaddr, state);
548 goto repeat;
549 default:
550 hlist_del(&obj->node);
551 free_object(obj);
552 break;
553 }
554 }
555 spin_unlock_irqrestore(&db->lock, flags);
556 if (cnt > debug_objects_maxchain)
557 debug_objects_maxchain = cnt;
558 }
559}
560
561void debug_check_no_obj_freed(const void *address, unsigned long size)
562{
563 if (debug_objects_enabled)
564 __debug_check_no_obj_freed(address, size);
565}
566#endif
567
568#ifdef CONFIG_DEBUG_FS
569
570static int debug_stats_show(struct seq_file *m, void *v)
571{
572 seq_printf(m, "max_chain :%d\n", debug_objects_maxchain);
573 seq_printf(m, "warnings :%d\n", debug_objects_warnings);
574 seq_printf(m, "fixups :%d\n", debug_objects_fixups);
575 seq_printf(m, "pool_free :%d\n", obj_pool_free);
576 seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
577 seq_printf(m, "pool_used :%d\n", obj_pool_used);
578 seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
579 return 0;
580}
581
582static int debug_stats_open(struct inode *inode, struct file *filp)
583{
584 return single_open(filp, debug_stats_show, NULL);
585}
586
587static const struct file_operations debug_stats_fops = {
588 .open = debug_stats_open,
589 .read = seq_read,
590 .llseek = seq_lseek,
591 .release = single_release,
592};
593
594static int __init debug_objects_init_debugfs(void)
595{
596 struct dentry *dbgdir, *dbgstats;
597
598 if (!debug_objects_enabled)
599 return 0;
600
601 dbgdir = debugfs_create_dir("debug_objects", NULL);
602 if (!dbgdir)
603 return -ENOMEM;
604
605 dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL,
606 &debug_stats_fops);
607 if (!dbgstats)
608 goto err;
609
610 return 0;
611
612err:
613 debugfs_remove(dbgdir);
614
615 return -ENOMEM;
616}
617__initcall(debug_objects_init_debugfs);
618
619#else
620static inline void debug_objects_init_debugfs(void) { }
621#endif
622
623#ifdef CONFIG_DEBUG_OBJECTS_SELFTEST
624
625/* Random data structure for the self test */
626struct self_test {
627 unsigned long dummy1[6];
628 int static_init;
629 unsigned long dummy2[3];
630};
631
632static __initdata struct debug_obj_descr descr_type_test;
633
634/*
635 * fixup_init is called when:
636 * - an active object is initialized
637 */
638static int __init fixup_init(void *addr, enum debug_obj_state state)
639{
640 struct self_test *obj = addr;
641
642 switch (state) {
643 case ODEBUG_STATE_ACTIVE:
644 debug_object_deactivate(obj, &descr_type_test);
645 debug_object_init(obj, &descr_type_test);
646 return 1;
647 default:
648 return 0;
649 }
650}
651
652/*
653 * fixup_activate is called when:
654 * - an active object is activated
655 * - an unknown object is activated (might be a statically initialized object)
656 */
657static int __init fixup_activate(void *addr, enum debug_obj_state state)
658{
659 struct self_test *obj = addr;
660
661 switch (state) {
662 case ODEBUG_STATE_NOTAVAILABLE:
663 if (obj->static_init == 1) {
664 debug_object_init(obj, &descr_type_test);
665 debug_object_activate(obj, &descr_type_test);
666 /*
667 * Real code should return 0 here ! This is
668 * not a fixup of some bad behaviour. We
669 * merily call the debug_init function to keep
670 * track of the object.
671 */
672 return 1;
673 } else {
674 /* Real code needs to emit a warning here */
675 }
676 return 0;
677
678 case ODEBUG_STATE_ACTIVE:
679 debug_object_deactivate(obj, &descr_type_test);
680 debug_object_activate(obj, &descr_type_test);
681 return 1;
682
683 default:
684 return 0;
685 }
686}
687
688/*
689 * fixup_destroy is called when:
690 * - an active object is destroyed
691 */
692static int __init fixup_destroy(void *addr, enum debug_obj_state state)
693{
694 struct self_test *obj = addr;
695
696 switch (state) {
697 case ODEBUG_STATE_ACTIVE:
698 debug_object_deactivate(obj, &descr_type_test);
699 debug_object_destroy(obj, &descr_type_test);
700 return 1;
701 default:
702 return 0;
703 }
704}
705
706/*
707 * fixup_free is called when:
708 * - an active object is freed
709 */
710static int __init fixup_free(void *addr, enum debug_obj_state state)
711{
712 struct self_test *obj = addr;
713
714 switch (state) {
715 case ODEBUG_STATE_ACTIVE:
716 debug_object_deactivate(obj, &descr_type_test);
717 debug_object_free(obj, &descr_type_test);
718 return 1;
719 default:
720 return 0;
721 }
722}
723
724static int
725check_results(void *addr, enum debug_obj_state state, int fixups, int warnings)
726{
727 struct debug_bucket *db;
728 struct debug_obj *obj;
729 unsigned long flags;
730 int res = -EINVAL;
731
732 db = get_bucket((unsigned long) addr);
733
734 spin_lock_irqsave(&db->lock, flags);
735
736 obj = lookup_object(addr, db);
737 if (!obj && state != ODEBUG_STATE_NONE) {
738 printk(KERN_ERR "ODEBUG: selftest object not found\n");
739 WARN_ON(1);
740 goto out;
741 }
742 if (obj && obj->state != state) {
743 printk(KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n",
744 obj->state, state);
745 WARN_ON(1);
746 goto out;
747 }
748 if (fixups != debug_objects_fixups) {
749 printk(KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n",
750 fixups, debug_objects_fixups);
751 WARN_ON(1);
752 goto out;
753 }
754 if (warnings != debug_objects_warnings) {
755 printk(KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n",
756 warnings, debug_objects_warnings);
757 WARN_ON(1);
758 goto out;
759 }
760 res = 0;
761out:
762 spin_unlock_irqrestore(&db->lock, flags);
763 if (res)
764 debug_objects_enabled = 0;
765 return res;
766}
767
768static __initdata struct debug_obj_descr descr_type_test = {
769 .name = "selftest",
770 .fixup_init = fixup_init,
771 .fixup_activate = fixup_activate,
772 .fixup_destroy = fixup_destroy,
773 .fixup_free = fixup_free,
774};
775
776static __initdata struct self_test obj = { .static_init = 0 };
777
778static void __init debug_objects_selftest(void)
779{
780 int fixups, oldfixups, warnings, oldwarnings;
781 unsigned long flags;
782
783 local_irq_save(flags);
784
785 fixups = oldfixups = debug_objects_fixups;
786 warnings = oldwarnings = debug_objects_warnings;
787 descr_test = &descr_type_test;
788
789 debug_object_init(&obj, &descr_type_test);
790 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
791 goto out;
792 debug_object_activate(&obj, &descr_type_test);
793 if (check_results(&obj, ODEBUG_STATE_ACTIVE, 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_deactivate(&obj, &descr_type_test);
799 if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings))
800 goto out;
801 debug_object_destroy(&obj, &descr_type_test);
802 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings))
803 goto out;
804 debug_object_init(&obj, &descr_type_test);
805 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
806 goto out;
807 debug_object_activate(&obj, &descr_type_test);
808 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
809 goto out;
810 debug_object_deactivate(&obj, &descr_type_test);
811 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
812 goto out;
813 debug_object_free(&obj, &descr_type_test);
814 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
815 goto out;
816
817 obj.static_init = 1;
818 debug_object_activate(&obj, &descr_type_test);
819 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, warnings))
820 goto out;
821 debug_object_init(&obj, &descr_type_test);
822 if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings))
823 goto out;
824 debug_object_free(&obj, &descr_type_test);
825 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
826 goto out;
827
828#ifdef CONFIG_DEBUG_OBJECTS_FREE
829 debug_object_init(&obj, &descr_type_test);
830 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
831 goto out;
832 debug_object_activate(&obj, &descr_type_test);
833 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
834 goto out;
835 __debug_check_no_obj_freed(&obj, sizeof(obj));
836 if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings))
837 goto out;
838#endif
839 printk(KERN_INFO "ODEBUG: selftest passed\n");
840
841out:
842 debug_objects_fixups = oldfixups;
843 debug_objects_warnings = oldwarnings;
844 descr_test = NULL;
845
846 local_irq_restore(flags);
847}
848#else
849static inline void debug_objects_selftest(void) { }
850#endif
851
852/*
853 * Called during early boot to initialize the hash buckets and link
854 * the static object pool objects into the poll list. After this call
855 * the object tracker is fully operational.
856 */
857void __init debug_objects_early_init(void)
858{
859 int i;
860
861 for (i = 0; i < ODEBUG_HASH_SIZE; i++)
862 spin_lock_init(&obj_hash[i].lock);
863
864 for (i = 0; i < ODEBUG_POOL_SIZE; i++)
865 hlist_add_head(&obj_static_pool[i].node, &obj_pool);
866}
867
868/*
869 * Called after the kmem_caches are functional to setup a dedicated
870 * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag
871 * prevents that the debug code is called on kmem_cache_free() for the
872 * debug tracker objects to avoid recursive calls.
873 */
874void __init debug_objects_mem_init(void)
875{
876 if (!debug_objects_enabled)
877 return;
878
879 obj_cache = kmem_cache_create("debug_objects_cache",
880 sizeof (struct debug_obj), 0,
881 SLAB_DEBUG_OBJECTS, NULL);
882
883 if (!obj_cache)
884 debug_objects_enabled = 0;
885 else
886 debug_objects_selftest();
887}
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-03 12:09:14 -0500