[ARM] dns323-setup.c: fix WARN() when booting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / lib / debugobjects.c
blobb862b30369ffe5afa25c471263964d62321a2872
1 /*
2 * Generic infrastructure for lifetime debugging of objects.
4 * Started by Thomas Gleixner
6 * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de>
8 * For licencing details see kernel-base/COPYING
9 */
10 #include <linux/debugobjects.h>
11 #include <linux/interrupt.h>
12 #include <linux/sched.h>
13 #include <linux/seq_file.h>
14 #include <linux/debugfs.h>
15 #include <linux/slab.h>
16 #include <linux/hash.h>
18 #define ODEBUG_HASH_BITS 14
19 #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS)
21 #define ODEBUG_POOL_SIZE 512
22 #define ODEBUG_POOL_MIN_LEVEL 256
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))
28 struct debug_bucket {
29 struct hlist_head list;
30 raw_spinlock_t lock;
33 static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE];
35 static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata;
37 static DEFINE_RAW_SPINLOCK(pool_lock);
39 static HLIST_HEAD(obj_pool);
41 static int obj_pool_min_free = ODEBUG_POOL_SIZE;
42 static int obj_pool_free = ODEBUG_POOL_SIZE;
43 static int obj_pool_used;
44 static int obj_pool_max_used;
45 static struct kmem_cache *obj_cache;
47 static int debug_objects_maxchain __read_mostly;
48 static int debug_objects_fixups __read_mostly;
49 static int debug_objects_warnings __read_mostly;
50 static int debug_objects_enabled __read_mostly
51 = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT;
53 static struct debug_obj_descr *descr_test __read_mostly;
55 static void free_obj_work(struct work_struct *work);
56 static DECLARE_WORK(debug_obj_work, free_obj_work);
58 static int __init enable_object_debug(char *str)
60 debug_objects_enabled = 1;
61 return 0;
64 static int __init disable_object_debug(char *str)
66 debug_objects_enabled = 0;
67 return 0;
70 early_param("debug_objects", enable_object_debug);
71 early_param("no_debug_objects", disable_object_debug);
73 static 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",
82 static int fill_pool(void)
84 gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN;
85 struct debug_obj *new;
86 unsigned long flags;
88 if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL))
89 return obj_pool_free;
91 if (unlikely(!obj_cache))
92 return obj_pool_free;
94 while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) {
96 new = kmem_cache_zalloc(obj_cache, gfp);
97 if (!new)
98 return obj_pool_free;
100 raw_spin_lock_irqsave(&pool_lock, flags);
101 hlist_add_head(&new->node, &obj_pool);
102 obj_pool_free++;
103 raw_spin_unlock_irqrestore(&pool_lock, flags);
105 return obj_pool_free;
109 * Lookup an object in the hash bucket.
111 static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b)
113 struct hlist_node *node;
114 struct debug_obj *obj;
115 int cnt = 0;
117 hlist_for_each_entry(obj, node, &b->list, node) {
118 cnt++;
119 if (obj->object == addr)
120 return obj;
122 if (cnt > debug_objects_maxchain)
123 debug_objects_maxchain = cnt;
125 return NULL;
129 * Allocate a new object. If the pool is empty, switch off the debugger.
130 * Must be called with interrupts disabled.
132 static struct debug_obj *
133 alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr)
135 struct debug_obj *obj = NULL;
137 raw_spin_lock(&pool_lock);
138 if (obj_pool.first) {
139 obj = hlist_entry(obj_pool.first, typeof(*obj), node);
141 obj->object = addr;
142 obj->descr = descr;
143 obj->state = ODEBUG_STATE_NONE;
144 hlist_del(&obj->node);
146 hlist_add_head(&obj->node, &b->list);
148 obj_pool_used++;
149 if (obj_pool_used > obj_pool_max_used)
150 obj_pool_max_used = obj_pool_used;
152 obj_pool_free--;
153 if (obj_pool_free < obj_pool_min_free)
154 obj_pool_min_free = obj_pool_free;
156 raw_spin_unlock(&pool_lock);
158 return obj;
162 * workqueue function to free objects.
164 static void free_obj_work(struct work_struct *work)
166 struct debug_obj *obj;
167 unsigned long flags;
169 raw_spin_lock_irqsave(&pool_lock, flags);
170 while (obj_pool_free > ODEBUG_POOL_SIZE) {
171 obj = hlist_entry(obj_pool.first, typeof(*obj), node);
172 hlist_del(&obj->node);
173 obj_pool_free--;
175 * We release pool_lock across kmem_cache_free() to
176 * avoid contention on pool_lock.
178 raw_spin_unlock_irqrestore(&pool_lock, flags);
179 kmem_cache_free(obj_cache, obj);
180 raw_spin_lock_irqsave(&pool_lock, flags);
182 raw_spin_unlock_irqrestore(&pool_lock, flags);
186 * Put the object back into the pool and schedule work to free objects
187 * if necessary.
189 static void free_object(struct debug_obj *obj)
191 unsigned long flags;
192 int sched = 0;
194 raw_spin_lock_irqsave(&pool_lock, flags);
196 * schedule work when the pool is filled and the cache is
197 * initialized:
199 if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache)
200 sched = !work_pending(&debug_obj_work);
201 hlist_add_head(&obj->node, &obj_pool);
202 obj_pool_free++;
203 obj_pool_used--;
204 raw_spin_unlock_irqrestore(&pool_lock, flags);
205 if (sched)
206 schedule_work(&debug_obj_work);
210 * We run out of memory. That means we probably have tons of objects
211 * allocated.
213 static void debug_objects_oom(void)
215 struct debug_bucket *db = obj_hash;
216 struct hlist_node *node, *tmp;
217 HLIST_HEAD(freelist);
218 struct debug_obj *obj;
219 unsigned long flags;
220 int i;
222 printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n");
224 for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
225 raw_spin_lock_irqsave(&db->lock, flags);
226 hlist_move_list(&db->list, &freelist);
227 raw_spin_unlock_irqrestore(&db->lock, flags);
229 /* Now free them */
230 hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) {
231 hlist_del(&obj->node);
232 free_object(obj);
238 * We use the pfn of the address for the hash. That way we can check
239 * for freed objects simply by checking the affected bucket.
241 static struct debug_bucket *get_bucket(unsigned long addr)
243 unsigned long hash;
245 hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS);
246 return &obj_hash[hash];
249 static void debug_print_object(struct debug_obj *obj, char *msg)
251 static int limit;
253 if (limit < 5 && obj->descr != descr_test) {
254 limit++;
255 WARN(1, KERN_ERR "ODEBUG: %s %s object type: %s\n", msg,
256 obj_states[obj->state], obj->descr->name);
258 debug_objects_warnings++;
262 * Try to repair the damage, so we have a better chance to get useful
263 * debug output.
265 static void
266 debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
267 void * addr, enum debug_obj_state state)
269 if (fixup)
270 debug_objects_fixups += fixup(addr, state);
273 static void debug_object_is_on_stack(void *addr, int onstack)
275 int is_on_stack;
276 static int limit;
278 if (limit > 4)
279 return;
281 is_on_stack = object_is_on_stack(addr);
282 if (is_on_stack == onstack)
283 return;
285 limit++;
286 if (is_on_stack)
287 printk(KERN_WARNING
288 "ODEBUG: object is on stack, but not annotated\n");
289 else
290 printk(KERN_WARNING
291 "ODEBUG: object is not on stack, but annotated\n");
292 WARN_ON(1);
295 static void
296 __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
298 enum debug_obj_state state;
299 struct debug_bucket *db;
300 struct debug_obj *obj;
301 unsigned long flags;
303 fill_pool();
305 db = get_bucket((unsigned long) addr);
307 raw_spin_lock_irqsave(&db->lock, flags);
309 obj = lookup_object(addr, db);
310 if (!obj) {
311 obj = alloc_object(addr, db, descr);
312 if (!obj) {
313 debug_objects_enabled = 0;
314 raw_spin_unlock_irqrestore(&db->lock, flags);
315 debug_objects_oom();
316 return;
318 debug_object_is_on_stack(addr, onstack);
321 switch (obj->state) {
322 case ODEBUG_STATE_NONE:
323 case ODEBUG_STATE_INIT:
324 case ODEBUG_STATE_INACTIVE:
325 obj->state = ODEBUG_STATE_INIT;
326 break;
328 case ODEBUG_STATE_ACTIVE:
329 debug_print_object(obj, "init");
330 state = obj->state;
331 raw_spin_unlock_irqrestore(&db->lock, flags);
332 debug_object_fixup(descr->fixup_init, addr, state);
333 return;
335 case ODEBUG_STATE_DESTROYED:
336 debug_print_object(obj, "init");
337 break;
338 default:
339 break;
342 raw_spin_unlock_irqrestore(&db->lock, flags);
346 * debug_object_init - debug checks when an object is initialized
347 * @addr: address of the object
348 * @descr: pointer to an object specific debug description structure
350 void debug_object_init(void *addr, struct debug_obj_descr *descr)
352 if (!debug_objects_enabled)
353 return;
355 __debug_object_init(addr, descr, 0);
359 * debug_object_init_on_stack - debug checks when an object on stack is
360 * initialized
361 * @addr: address of the object
362 * @descr: pointer to an object specific debug description structure
364 void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr)
366 if (!debug_objects_enabled)
367 return;
369 __debug_object_init(addr, descr, 1);
373 * debug_object_activate - debug checks when an object is activated
374 * @addr: address of the object
375 * @descr: pointer to an object specific debug description structure
377 void debug_object_activate(void *addr, struct debug_obj_descr *descr)
379 enum debug_obj_state state;
380 struct debug_bucket *db;
381 struct debug_obj *obj;
382 unsigned long flags;
384 if (!debug_objects_enabled)
385 return;
387 db = get_bucket((unsigned long) addr);
389 raw_spin_lock_irqsave(&db->lock, flags);
391 obj = lookup_object(addr, db);
392 if (obj) {
393 switch (obj->state) {
394 case ODEBUG_STATE_INIT:
395 case ODEBUG_STATE_INACTIVE:
396 obj->state = ODEBUG_STATE_ACTIVE;
397 break;
399 case ODEBUG_STATE_ACTIVE:
400 debug_print_object(obj, "activate");
401 state = obj->state;
402 raw_spin_unlock_irqrestore(&db->lock, flags);
403 debug_object_fixup(descr->fixup_activate, addr, state);
404 return;
406 case ODEBUG_STATE_DESTROYED:
407 debug_print_object(obj, "activate");
408 break;
409 default:
410 break;
412 raw_spin_unlock_irqrestore(&db->lock, flags);
413 return;
416 raw_spin_unlock_irqrestore(&db->lock, flags);
418 * This happens when a static object is activated. We
419 * let the type specific code decide whether this is
420 * true or not.
422 debug_object_fixup(descr->fixup_activate, addr,
423 ODEBUG_STATE_NOTAVAILABLE);
427 * debug_object_deactivate - debug checks when an object is deactivated
428 * @addr: address of the object
429 * @descr: pointer to an object specific debug description structure
431 void debug_object_deactivate(void *addr, struct debug_obj_descr *descr)
433 struct debug_bucket *db;
434 struct debug_obj *obj;
435 unsigned long flags;
437 if (!debug_objects_enabled)
438 return;
440 db = get_bucket((unsigned long) addr);
442 raw_spin_lock_irqsave(&db->lock, flags);
444 obj = lookup_object(addr, db);
445 if (obj) {
446 switch (obj->state) {
447 case ODEBUG_STATE_INIT:
448 case ODEBUG_STATE_INACTIVE:
449 case ODEBUG_STATE_ACTIVE:
450 obj->state = ODEBUG_STATE_INACTIVE;
451 break;
453 case ODEBUG_STATE_DESTROYED:
454 debug_print_object(obj, "deactivate");
455 break;
456 default:
457 break;
459 } else {
460 struct debug_obj o = { .object = addr,
461 .state = ODEBUG_STATE_NOTAVAILABLE,
462 .descr = descr };
464 debug_print_object(&o, "deactivate");
467 raw_spin_unlock_irqrestore(&db->lock, flags);
471 * debug_object_destroy - debug checks when an object is destroyed
472 * @addr: address of the object
473 * @descr: pointer to an object specific debug description structure
475 void debug_object_destroy(void *addr, struct debug_obj_descr *descr)
477 enum debug_obj_state state;
478 struct debug_bucket *db;
479 struct debug_obj *obj;
480 unsigned long flags;
482 if (!debug_objects_enabled)
483 return;
485 db = get_bucket((unsigned long) addr);
487 raw_spin_lock_irqsave(&db->lock, flags);
489 obj = lookup_object(addr, db);
490 if (!obj)
491 goto out_unlock;
493 switch (obj->state) {
494 case ODEBUG_STATE_NONE:
495 case ODEBUG_STATE_INIT:
496 case ODEBUG_STATE_INACTIVE:
497 obj->state = ODEBUG_STATE_DESTROYED;
498 break;
499 case ODEBUG_STATE_ACTIVE:
500 debug_print_object(obj, "destroy");
501 state = obj->state;
502 raw_spin_unlock_irqrestore(&db->lock, flags);
503 debug_object_fixup(descr->fixup_destroy, addr, state);
504 return;
506 case ODEBUG_STATE_DESTROYED:
507 debug_print_object(obj, "destroy");
508 break;
509 default:
510 break;
512 out_unlock:
513 raw_spin_unlock_irqrestore(&db->lock, flags);
517 * debug_object_free - debug checks when an object is freed
518 * @addr: address of the object
519 * @descr: pointer to an object specific debug description structure
521 void debug_object_free(void *addr, struct debug_obj_descr *descr)
523 enum debug_obj_state state;
524 struct debug_bucket *db;
525 struct debug_obj *obj;
526 unsigned long flags;
528 if (!debug_objects_enabled)
529 return;
531 db = get_bucket((unsigned long) addr);
533 raw_spin_lock_irqsave(&db->lock, flags);
535 obj = lookup_object(addr, db);
536 if (!obj)
537 goto out_unlock;
539 switch (obj->state) {
540 case ODEBUG_STATE_ACTIVE:
541 debug_print_object(obj, "free");
542 state = obj->state;
543 raw_spin_unlock_irqrestore(&db->lock, flags);
544 debug_object_fixup(descr->fixup_free, addr, state);
545 return;
546 default:
547 hlist_del(&obj->node);
548 raw_spin_unlock_irqrestore(&db->lock, flags);
549 free_object(obj);
550 return;
552 out_unlock:
553 raw_spin_unlock_irqrestore(&db->lock, flags);
556 #ifdef CONFIG_DEBUG_OBJECTS_FREE
557 static void __debug_check_no_obj_freed(const void *address, unsigned long size)
559 unsigned long flags, oaddr, saddr, eaddr, paddr, chunks;
560 struct hlist_node *node, *tmp;
561 HLIST_HEAD(freelist);
562 struct debug_obj_descr *descr;
563 enum debug_obj_state state;
564 struct debug_bucket *db;
565 struct debug_obj *obj;
566 int cnt;
568 saddr = (unsigned long) address;
569 eaddr = saddr + size;
570 paddr = saddr & ODEBUG_CHUNK_MASK;
571 chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1));
572 chunks >>= ODEBUG_CHUNK_SHIFT;
574 for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) {
575 db = get_bucket(paddr);
577 repeat:
578 cnt = 0;
579 raw_spin_lock_irqsave(&db->lock, flags);
580 hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
581 cnt++;
582 oaddr = (unsigned long) obj->object;
583 if (oaddr < saddr || oaddr >= eaddr)
584 continue;
586 switch (obj->state) {
587 case ODEBUG_STATE_ACTIVE:
588 debug_print_object(obj, "free");
589 descr = obj->descr;
590 state = obj->state;
591 raw_spin_unlock_irqrestore(&db->lock, flags);
592 debug_object_fixup(descr->fixup_free,
593 (void *) oaddr, state);
594 goto repeat;
595 default:
596 hlist_del(&obj->node);
597 hlist_add_head(&obj->node, &freelist);
598 break;
601 raw_spin_unlock_irqrestore(&db->lock, flags);
603 /* Now free them */
604 hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) {
605 hlist_del(&obj->node);
606 free_object(obj);
609 if (cnt > debug_objects_maxchain)
610 debug_objects_maxchain = cnt;
614 void debug_check_no_obj_freed(const void *address, unsigned long size)
616 if (debug_objects_enabled)
617 __debug_check_no_obj_freed(address, size);
619 #endif
621 #ifdef CONFIG_DEBUG_FS
623 static int debug_stats_show(struct seq_file *m, void *v)
625 seq_printf(m, "max_chain :%d\n", debug_objects_maxchain);
626 seq_printf(m, "warnings :%d\n", debug_objects_warnings);
627 seq_printf(m, "fixups :%d\n", debug_objects_fixups);
628 seq_printf(m, "pool_free :%d\n", obj_pool_free);
629 seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
630 seq_printf(m, "pool_used :%d\n", obj_pool_used);
631 seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
632 return 0;
635 static int debug_stats_open(struct inode *inode, struct file *filp)
637 return single_open(filp, debug_stats_show, NULL);
640 static const struct file_operations debug_stats_fops = {
641 .open = debug_stats_open,
642 .read = seq_read,
643 .llseek = seq_lseek,
644 .release = single_release,
647 static int __init debug_objects_init_debugfs(void)
649 struct dentry *dbgdir, *dbgstats;
651 if (!debug_objects_enabled)
652 return 0;
654 dbgdir = debugfs_create_dir("debug_objects", NULL);
655 if (!dbgdir)
656 return -ENOMEM;
658 dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL,
659 &debug_stats_fops);
660 if (!dbgstats)
661 goto err;
663 return 0;
665 err:
666 debugfs_remove(dbgdir);
668 return -ENOMEM;
670 __initcall(debug_objects_init_debugfs);
672 #else
673 static inline void debug_objects_init_debugfs(void) { }
674 #endif
676 #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST
678 /* Random data structure for the self test */
679 struct self_test {
680 unsigned long dummy1[6];
681 int static_init;
682 unsigned long dummy2[3];
685 static __initdata struct debug_obj_descr descr_type_test;
688 * fixup_init is called when:
689 * - an active object is initialized
691 static int __init fixup_init(void *addr, enum debug_obj_state state)
693 struct self_test *obj = addr;
695 switch (state) {
696 case ODEBUG_STATE_ACTIVE:
697 debug_object_deactivate(obj, &descr_type_test);
698 debug_object_init(obj, &descr_type_test);
699 return 1;
700 default:
701 return 0;
706 * fixup_activate is called when:
707 * - an active object is activated
708 * - an unknown object is activated (might be a statically initialized object)
710 static int __init fixup_activate(void *addr, enum debug_obj_state state)
712 struct self_test *obj = addr;
714 switch (state) {
715 case ODEBUG_STATE_NOTAVAILABLE:
716 if (obj->static_init == 1) {
717 debug_object_init(obj, &descr_type_test);
718 debug_object_activate(obj, &descr_type_test);
720 * Real code should return 0 here ! This is
721 * not a fixup of some bad behaviour. We
722 * merily call the debug_init function to keep
723 * track of the object.
725 return 1;
726 } else {
727 /* Real code needs to emit a warning here */
729 return 0;
731 case ODEBUG_STATE_ACTIVE:
732 debug_object_deactivate(obj, &descr_type_test);
733 debug_object_activate(obj, &descr_type_test);
734 return 1;
736 default:
737 return 0;
742 * fixup_destroy is called when:
743 * - an active object is destroyed
745 static int __init fixup_destroy(void *addr, enum debug_obj_state state)
747 struct self_test *obj = addr;
749 switch (state) {
750 case ODEBUG_STATE_ACTIVE:
751 debug_object_deactivate(obj, &descr_type_test);
752 debug_object_destroy(obj, &descr_type_test);
753 return 1;
754 default:
755 return 0;
760 * fixup_free is called when:
761 * - an active object is freed
763 static int __init fixup_free(void *addr, enum debug_obj_state state)
765 struct self_test *obj = addr;
767 switch (state) {
768 case ODEBUG_STATE_ACTIVE:
769 debug_object_deactivate(obj, &descr_type_test);
770 debug_object_free(obj, &descr_type_test);
771 return 1;
772 default:
773 return 0;
777 static int
778 check_results(void *addr, enum debug_obj_state state, int fixups, int warnings)
780 struct debug_bucket *db;
781 struct debug_obj *obj;
782 unsigned long flags;
783 int res = -EINVAL;
785 db = get_bucket((unsigned long) addr);
787 raw_spin_lock_irqsave(&db->lock, flags);
789 obj = lookup_object(addr, db);
790 if (!obj && state != ODEBUG_STATE_NONE) {
791 WARN(1, KERN_ERR "ODEBUG: selftest object not found\n");
792 goto out;
794 if (obj && obj->state != state) {
795 WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n",
796 obj->state, state);
797 goto out;
799 if (fixups != debug_objects_fixups) {
800 WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n",
801 fixups, debug_objects_fixups);
802 goto out;
804 if (warnings != debug_objects_warnings) {
805 WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n",
806 warnings, debug_objects_warnings);
807 goto out;
809 res = 0;
810 out:
811 raw_spin_unlock_irqrestore(&db->lock, flags);
812 if (res)
813 debug_objects_enabled = 0;
814 return res;
817 static __initdata struct debug_obj_descr descr_type_test = {
818 .name = "selftest",
819 .fixup_init = fixup_init,
820 .fixup_activate = fixup_activate,
821 .fixup_destroy = fixup_destroy,
822 .fixup_free = fixup_free,
825 static __initdata struct self_test obj = { .static_init = 0 };
827 static void __init debug_objects_selftest(void)
829 int fixups, oldfixups, warnings, oldwarnings;
830 unsigned long flags;
832 local_irq_save(flags);
834 fixups = oldfixups = debug_objects_fixups;
835 warnings = oldwarnings = debug_objects_warnings;
836 descr_test = &descr_type_test;
838 debug_object_init(&obj, &descr_type_test);
839 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
840 goto out;
841 debug_object_activate(&obj, &descr_type_test);
842 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
843 goto out;
844 debug_object_activate(&obj, &descr_type_test);
845 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings))
846 goto out;
847 debug_object_deactivate(&obj, &descr_type_test);
848 if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings))
849 goto out;
850 debug_object_destroy(&obj, &descr_type_test);
851 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings))
852 goto out;
853 debug_object_init(&obj, &descr_type_test);
854 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
855 goto out;
856 debug_object_activate(&obj, &descr_type_test);
857 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
858 goto out;
859 debug_object_deactivate(&obj, &descr_type_test);
860 if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings))
861 goto out;
862 debug_object_free(&obj, &descr_type_test);
863 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
864 goto out;
866 obj.static_init = 1;
867 debug_object_activate(&obj, &descr_type_test);
868 if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, warnings))
869 goto out;
870 debug_object_init(&obj, &descr_type_test);
871 if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings))
872 goto out;
873 debug_object_free(&obj, &descr_type_test);
874 if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings))
875 goto out;
877 #ifdef CONFIG_DEBUG_OBJECTS_FREE
878 debug_object_init(&obj, &descr_type_test);
879 if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings))
880 goto out;
881 debug_object_activate(&obj, &descr_type_test);
882 if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
883 goto out;
884 __debug_check_no_obj_freed(&obj, sizeof(obj));
885 if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings))
886 goto out;
887 #endif
888 printk(KERN_INFO "ODEBUG: selftest passed\n");
890 out:
891 debug_objects_fixups = oldfixups;
892 debug_objects_warnings = oldwarnings;
893 descr_test = NULL;
895 local_irq_restore(flags);
897 #else
898 static inline void debug_objects_selftest(void) { }
899 #endif
902 * Called during early boot to initialize the hash buckets and link
903 * the static object pool objects into the poll list. After this call
904 * the object tracker is fully operational.
906 void __init debug_objects_early_init(void)
908 int i;
910 for (i = 0; i < ODEBUG_HASH_SIZE; i++)
911 raw_spin_lock_init(&obj_hash[i].lock);
913 for (i = 0; i < ODEBUG_POOL_SIZE; i++)
914 hlist_add_head(&obj_static_pool[i].node, &obj_pool);
918 * Convert the statically allocated objects to dynamic ones:
920 static int debug_objects_replace_static_objects(void)
922 struct debug_bucket *db = obj_hash;
923 struct hlist_node *node, *tmp;
924 struct debug_obj *obj, *new;
925 HLIST_HEAD(objects);
926 int i, cnt = 0;
928 for (i = 0; i < ODEBUG_POOL_SIZE; i++) {
929 obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL);
930 if (!obj)
931 goto free;
932 hlist_add_head(&obj->node, &objects);
936 * When debug_objects_mem_init() is called we know that only
937 * one CPU is up, so disabling interrupts is enough
938 * protection. This avoids the lockdep hell of lock ordering.
940 local_irq_disable();
942 /* Remove the statically allocated objects from the pool */
943 hlist_for_each_entry_safe(obj, node, tmp, &obj_pool, node)
944 hlist_del(&obj->node);
945 /* Move the allocated objects to the pool */
946 hlist_move_list(&objects, &obj_pool);
948 /* Replace the active object references */
949 for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
950 hlist_move_list(&db->list, &objects);
952 hlist_for_each_entry(obj, node, &objects, node) {
953 new = hlist_entry(obj_pool.first, typeof(*obj), node);
954 hlist_del(&new->node);
955 /* copy object data */
956 *new = *obj;
957 hlist_add_head(&new->node, &db->list);
958 cnt++;
962 printk(KERN_DEBUG "ODEBUG: %d of %d active objects replaced\n", cnt,
963 obj_pool_used);
964 local_irq_enable();
965 return 0;
966 free:
967 hlist_for_each_entry_safe(obj, node, tmp, &objects, node) {
968 hlist_del(&obj->node);
969 kmem_cache_free(obj_cache, obj);
971 return -ENOMEM;
975 * Called after the kmem_caches are functional to setup a dedicated
976 * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag
977 * prevents that the debug code is called on kmem_cache_free() for the
978 * debug tracker objects to avoid recursive calls.
980 void __init debug_objects_mem_init(void)
982 if (!debug_objects_enabled)
983 return;
985 obj_cache = kmem_cache_create("debug_objects_cache",
986 sizeof (struct debug_obj), 0,
987 SLAB_DEBUG_OBJECTS, NULL);
989 if (!obj_cache || debug_objects_replace_static_objects()) {
990 debug_objects_enabled = 0;
991 if (obj_cache)
992 kmem_cache_destroy(obj_cache);
993 printk(KERN_WARNING "ODEBUG: out of memory.\n");
994 } else
995 debug_objects_selftest();