Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 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> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 12 | #include <linux/sched.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 13 | #include <linux/seq_file.h> |
| 14 | #include <linux/debugfs.h> |
| 15 | #include <linux/hash.h> |
| 16 | |
| 17 | #define ODEBUG_HASH_BITS 14 |
| 18 | #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) |
| 19 | |
| 20 | #define ODEBUG_POOL_SIZE 512 |
| 21 | #define ODEBUG_POOL_MIN_LEVEL 256 |
| 22 | |
| 23 | #define ODEBUG_CHUNK_SHIFT PAGE_SHIFT |
| 24 | #define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT) |
| 25 | #define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) |
| 26 | |
| 27 | struct debug_bucket { |
| 28 | struct hlist_head list; |
| 29 | spinlock_t lock; |
| 30 | }; |
| 31 | |
| 32 | static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; |
| 33 | |
Thomas Gleixner | 1be1cb7 | 2009-03-16 18:53:18 +0100 | [diff] [blame] | 34 | static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 35 | |
| 36 | static DEFINE_SPINLOCK(pool_lock); |
| 37 | |
| 38 | static HLIST_HEAD(obj_pool); |
| 39 | |
| 40 | static int obj_pool_min_free = ODEBUG_POOL_SIZE; |
| 41 | static int obj_pool_free = ODEBUG_POOL_SIZE; |
| 42 | static int obj_pool_used; |
| 43 | static int obj_pool_max_used; |
| 44 | static struct kmem_cache *obj_cache; |
| 45 | |
| 46 | static int debug_objects_maxchain __read_mostly; |
| 47 | static int debug_objects_fixups __read_mostly; |
| 48 | static int debug_objects_warnings __read_mostly; |
Ingo Molnar | 3ae7020 | 2008-11-26 10:02:00 +0100 | [diff] [blame] | 49 | static int debug_objects_enabled __read_mostly |
| 50 | = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; |
| 51 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 52 | static struct debug_obj_descr *descr_test __read_mostly; |
| 53 | |
Thomas Gleixner | 337fff8 | 2009-03-16 10:04:53 +0100 | [diff] [blame] | 54 | static void free_obj_work(struct work_struct *work); |
| 55 | static DECLARE_WORK(debug_obj_work, free_obj_work); |
| 56 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 57 | static int __init enable_object_debug(char *str) |
| 58 | { |
| 59 | debug_objects_enabled = 1; |
| 60 | return 0; |
| 61 | } |
Kyle McMartin | 3e8ebb5 | 2009-03-01 20:41:41 -0500 | [diff] [blame] | 62 | |
| 63 | static int __init disable_object_debug(char *str) |
| 64 | { |
| 65 | debug_objects_enabled = 0; |
| 66 | return 0; |
| 67 | } |
| 68 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 69 | early_param("debug_objects", enable_object_debug); |
Kyle McMartin | 3e8ebb5 | 2009-03-01 20:41:41 -0500 | [diff] [blame] | 70 | early_param("no_debug_objects", disable_object_debug); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 71 | |
| 72 | static const char *obj_states[ODEBUG_STATE_MAX] = { |
| 73 | [ODEBUG_STATE_NONE] = "none", |
| 74 | [ODEBUG_STATE_INIT] = "initialized", |
| 75 | [ODEBUG_STATE_INACTIVE] = "inactive", |
| 76 | [ODEBUG_STATE_ACTIVE] = "active", |
| 77 | [ODEBUG_STATE_DESTROYED] = "destroyed", |
| 78 | [ODEBUG_STATE_NOTAVAILABLE] = "not available", |
| 79 | }; |
| 80 | |
| 81 | static int fill_pool(void) |
| 82 | { |
| 83 | gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; |
| 84 | struct debug_obj *new; |
Vegard Nossum | 50db04d | 2008-06-15 00:47:36 +0200 | [diff] [blame] | 85 | unsigned long flags; |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 86 | |
| 87 | if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL)) |
| 88 | return obj_pool_free; |
| 89 | |
| 90 | if (unlikely(!obj_cache)) |
| 91 | return obj_pool_free; |
| 92 | |
| 93 | while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) { |
| 94 | |
| 95 | new = kmem_cache_zalloc(obj_cache, gfp); |
| 96 | if (!new) |
| 97 | return obj_pool_free; |
| 98 | |
Vegard Nossum | 50db04d | 2008-06-15 00:47:36 +0200 | [diff] [blame] | 99 | spin_lock_irqsave(&pool_lock, flags); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 100 | hlist_add_head(&new->node, &obj_pool); |
| 101 | obj_pool_free++; |
Vegard Nossum | 50db04d | 2008-06-15 00:47:36 +0200 | [diff] [blame] | 102 | spin_unlock_irqrestore(&pool_lock, flags); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 103 | } |
| 104 | return obj_pool_free; |
| 105 | } |
| 106 | |
| 107 | /* |
| 108 | * Lookup an object in the hash bucket. |
| 109 | */ |
| 110 | static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) |
| 111 | { |
| 112 | struct hlist_node *node; |
| 113 | struct debug_obj *obj; |
| 114 | int cnt = 0; |
| 115 | |
| 116 | hlist_for_each_entry(obj, node, &b->list, node) { |
| 117 | cnt++; |
| 118 | if (obj->object == addr) |
| 119 | return obj; |
| 120 | } |
| 121 | if (cnt > debug_objects_maxchain) |
| 122 | debug_objects_maxchain = cnt; |
| 123 | |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | /* |
Vegard Nossum | 50db04d | 2008-06-15 00:47:36 +0200 | [diff] [blame] | 128 | * Allocate a new object. If the pool is empty, switch off the debugger. |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 129 | * Must be called with interrupts disabled. |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 130 | */ |
| 131 | static struct debug_obj * |
| 132 | alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) |
| 133 | { |
| 134 | struct debug_obj *obj = NULL; |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 135 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 136 | spin_lock(&pool_lock); |
| 137 | if (obj_pool.first) { |
| 138 | obj = hlist_entry(obj_pool.first, typeof(*obj), node); |
| 139 | |
| 140 | obj->object = addr; |
| 141 | obj->descr = descr; |
| 142 | obj->state = ODEBUG_STATE_NONE; |
| 143 | hlist_del(&obj->node); |
| 144 | |
| 145 | hlist_add_head(&obj->node, &b->list); |
| 146 | |
| 147 | obj_pool_used++; |
| 148 | if (obj_pool_used > obj_pool_max_used) |
| 149 | obj_pool_max_used = obj_pool_used; |
| 150 | |
| 151 | obj_pool_free--; |
| 152 | if (obj_pool_free < obj_pool_min_free) |
| 153 | obj_pool_min_free = obj_pool_free; |
| 154 | } |
| 155 | spin_unlock(&pool_lock); |
| 156 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 157 | return obj; |
| 158 | } |
| 159 | |
| 160 | /* |
Thomas Gleixner | 337fff8 | 2009-03-16 10:04:53 +0100 | [diff] [blame] | 161 | * workqueue function to free objects. |
| 162 | */ |
| 163 | static void free_obj_work(struct work_struct *work) |
| 164 | { |
| 165 | struct debug_obj *obj; |
| 166 | unsigned long flags; |
| 167 | |
| 168 | spin_lock_irqsave(&pool_lock, flags); |
| 169 | while (obj_pool_free > ODEBUG_POOL_SIZE) { |
| 170 | obj = hlist_entry(obj_pool.first, typeof(*obj), node); |
| 171 | hlist_del(&obj->node); |
| 172 | obj_pool_free--; |
| 173 | /* |
| 174 | * We release pool_lock across kmem_cache_free() to |
| 175 | * avoid contention on pool_lock. |
| 176 | */ |
| 177 | spin_unlock_irqrestore(&pool_lock, flags); |
| 178 | kmem_cache_free(obj_cache, obj); |
| 179 | spin_lock_irqsave(&pool_lock, flags); |
| 180 | } |
| 181 | spin_unlock_irqrestore(&pool_lock, flags); |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * Put the object back into the pool and schedule work to free objects |
| 186 | * if necessary. |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 187 | */ |
| 188 | static void free_object(struct debug_obj *obj) |
| 189 | { |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 190 | unsigned long flags; |
Thomas Gleixner | 337fff8 | 2009-03-16 10:04:53 +0100 | [diff] [blame] | 191 | int sched = 0; |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 192 | |
Thomas Gleixner | 337fff8 | 2009-03-16 10:04:53 +0100 | [diff] [blame] | 193 | spin_lock_irqsave(&pool_lock, flags); |
| 194 | /* |
| 195 | * schedule work when the pool is filled and the cache is |
| 196 | * initialized: |
| 197 | */ |
| 198 | if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache) |
| 199 | sched = !work_pending(&debug_obj_work); |
| 200 | hlist_add_head(&obj->node, &obj_pool); |
| 201 | obj_pool_free++; |
| 202 | obj_pool_used--; |
| 203 | spin_unlock_irqrestore(&pool_lock, flags); |
| 204 | if (sched) |
| 205 | schedule_work(&debug_obj_work); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | /* |
| 209 | * We run out of memory. That means we probably have tons of objects |
| 210 | * allocated. |
| 211 | */ |
| 212 | static void debug_objects_oom(void) |
| 213 | { |
| 214 | struct debug_bucket *db = obj_hash; |
| 215 | struct hlist_node *node, *tmp; |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 216 | HLIST_HEAD(freelist); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 217 | struct debug_obj *obj; |
| 218 | unsigned long flags; |
| 219 | int i; |
| 220 | |
| 221 | printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n"); |
| 222 | |
| 223 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { |
| 224 | spin_lock_irqsave(&db->lock, flags); |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 225 | hlist_move_list(&db->list, &freelist); |
| 226 | spin_unlock_irqrestore(&db->lock, flags); |
| 227 | |
| 228 | /* Now free them */ |
| 229 | hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) { |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 230 | hlist_del(&obj->node); |
| 231 | free_object(obj); |
| 232 | } |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * We use the pfn of the address for the hash. That way we can check |
| 238 | * for freed objects simply by checking the affected bucket. |
| 239 | */ |
| 240 | static struct debug_bucket *get_bucket(unsigned long addr) |
| 241 | { |
| 242 | unsigned long hash; |
| 243 | |
| 244 | hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); |
| 245 | return &obj_hash[hash]; |
| 246 | } |
| 247 | |
| 248 | static void debug_print_object(struct debug_obj *obj, char *msg) |
| 249 | { |
| 250 | static int limit; |
| 251 | |
| 252 | if (limit < 5 && obj->descr != descr_test) { |
| 253 | limit++; |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 254 | WARN(1, KERN_ERR "ODEBUG: %s %s object type: %s\n", msg, |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 255 | obj_states[obj->state], obj->descr->name); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 256 | } |
| 257 | debug_objects_warnings++; |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Try to repair the damage, so we have a better chance to get useful |
| 262 | * debug output. |
| 263 | */ |
| 264 | static void |
| 265 | debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state), |
| 266 | void * addr, enum debug_obj_state state) |
| 267 | { |
| 268 | if (fixup) |
| 269 | debug_objects_fixups += fixup(addr, state); |
| 270 | } |
| 271 | |
| 272 | static void debug_object_is_on_stack(void *addr, int onstack) |
| 273 | { |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 274 | int is_on_stack; |
| 275 | static int limit; |
| 276 | |
| 277 | if (limit > 4) |
| 278 | return; |
| 279 | |
FUJITA Tomonori | 8b05c7e | 2008-07-23 21:26:53 -0700 | [diff] [blame] | 280 | is_on_stack = object_is_on_stack(addr); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 281 | if (is_on_stack == onstack) |
| 282 | return; |
| 283 | |
| 284 | limit++; |
| 285 | if (is_on_stack) |
| 286 | printk(KERN_WARNING |
| 287 | "ODEBUG: object is on stack, but not annotated\n"); |
| 288 | else |
| 289 | printk(KERN_WARNING |
| 290 | "ODEBUG: object is not on stack, but annotated\n"); |
| 291 | WARN_ON(1); |
| 292 | } |
| 293 | |
| 294 | static void |
| 295 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) |
| 296 | { |
| 297 | enum debug_obj_state state; |
| 298 | struct debug_bucket *db; |
| 299 | struct debug_obj *obj; |
| 300 | unsigned long flags; |
| 301 | |
Vegard Nossum | 50db04d | 2008-06-15 00:47:36 +0200 | [diff] [blame] | 302 | fill_pool(); |
| 303 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 304 | db = get_bucket((unsigned long) addr); |
| 305 | |
| 306 | spin_lock_irqsave(&db->lock, flags); |
| 307 | |
| 308 | obj = lookup_object(addr, db); |
| 309 | if (!obj) { |
| 310 | obj = alloc_object(addr, db, descr); |
| 311 | if (!obj) { |
| 312 | debug_objects_enabled = 0; |
| 313 | spin_unlock_irqrestore(&db->lock, flags); |
| 314 | debug_objects_oom(); |
| 315 | return; |
| 316 | } |
| 317 | debug_object_is_on_stack(addr, onstack); |
| 318 | } |
| 319 | |
| 320 | switch (obj->state) { |
| 321 | case ODEBUG_STATE_NONE: |
| 322 | case ODEBUG_STATE_INIT: |
| 323 | case ODEBUG_STATE_INACTIVE: |
| 324 | obj->state = ODEBUG_STATE_INIT; |
| 325 | break; |
| 326 | |
| 327 | case ODEBUG_STATE_ACTIVE: |
| 328 | debug_print_object(obj, "init"); |
| 329 | state = obj->state; |
| 330 | spin_unlock_irqrestore(&db->lock, flags); |
| 331 | debug_object_fixup(descr->fixup_init, addr, state); |
| 332 | return; |
| 333 | |
| 334 | case ODEBUG_STATE_DESTROYED: |
| 335 | debug_print_object(obj, "init"); |
| 336 | break; |
| 337 | default: |
| 338 | break; |
| 339 | } |
| 340 | |
| 341 | spin_unlock_irqrestore(&db->lock, flags); |
| 342 | } |
| 343 | |
| 344 | /** |
| 345 | * debug_object_init - debug checks when an object is initialized |
| 346 | * @addr: address of the object |
| 347 | * @descr: pointer to an object specific debug description structure |
| 348 | */ |
| 349 | void debug_object_init(void *addr, struct debug_obj_descr *descr) |
| 350 | { |
| 351 | if (!debug_objects_enabled) |
| 352 | return; |
| 353 | |
| 354 | __debug_object_init(addr, descr, 0); |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * debug_object_init_on_stack - debug checks when an object on stack is |
| 359 | * initialized |
| 360 | * @addr: address of the object |
| 361 | * @descr: pointer to an object specific debug description structure |
| 362 | */ |
| 363 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) |
| 364 | { |
| 365 | if (!debug_objects_enabled) |
| 366 | return; |
| 367 | |
| 368 | __debug_object_init(addr, descr, 1); |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * debug_object_activate - debug checks when an object is activated |
| 373 | * @addr: address of the object |
| 374 | * @descr: pointer to an object specific debug description structure |
| 375 | */ |
| 376 | void debug_object_activate(void *addr, struct debug_obj_descr *descr) |
| 377 | { |
| 378 | enum debug_obj_state state; |
| 379 | struct debug_bucket *db; |
| 380 | struct debug_obj *obj; |
| 381 | unsigned long flags; |
| 382 | |
| 383 | if (!debug_objects_enabled) |
| 384 | return; |
| 385 | |
| 386 | db = get_bucket((unsigned long) addr); |
| 387 | |
| 388 | spin_lock_irqsave(&db->lock, flags); |
| 389 | |
| 390 | obj = lookup_object(addr, db); |
| 391 | if (obj) { |
| 392 | switch (obj->state) { |
| 393 | case ODEBUG_STATE_INIT: |
| 394 | case ODEBUG_STATE_INACTIVE: |
| 395 | obj->state = ODEBUG_STATE_ACTIVE; |
| 396 | break; |
| 397 | |
| 398 | case ODEBUG_STATE_ACTIVE: |
| 399 | debug_print_object(obj, "activate"); |
| 400 | state = obj->state; |
| 401 | spin_unlock_irqrestore(&db->lock, flags); |
| 402 | debug_object_fixup(descr->fixup_activate, addr, state); |
| 403 | return; |
| 404 | |
| 405 | case ODEBUG_STATE_DESTROYED: |
| 406 | debug_print_object(obj, "activate"); |
| 407 | break; |
| 408 | default: |
| 409 | break; |
| 410 | } |
| 411 | spin_unlock_irqrestore(&db->lock, flags); |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | spin_unlock_irqrestore(&db->lock, flags); |
| 416 | /* |
| 417 | * This happens when a static object is activated. We |
| 418 | * let the type specific code decide whether this is |
| 419 | * true or not. |
| 420 | */ |
| 421 | debug_object_fixup(descr->fixup_activate, addr, |
| 422 | ODEBUG_STATE_NOTAVAILABLE); |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * debug_object_deactivate - debug checks when an object is deactivated |
| 427 | * @addr: address of the object |
| 428 | * @descr: pointer to an object specific debug description structure |
| 429 | */ |
| 430 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) |
| 431 | { |
| 432 | struct debug_bucket *db; |
| 433 | struct debug_obj *obj; |
| 434 | unsigned long flags; |
| 435 | |
| 436 | if (!debug_objects_enabled) |
| 437 | return; |
| 438 | |
| 439 | db = get_bucket((unsigned long) addr); |
| 440 | |
| 441 | spin_lock_irqsave(&db->lock, flags); |
| 442 | |
| 443 | obj = lookup_object(addr, db); |
| 444 | if (obj) { |
| 445 | switch (obj->state) { |
| 446 | case ODEBUG_STATE_INIT: |
| 447 | case ODEBUG_STATE_INACTIVE: |
| 448 | case ODEBUG_STATE_ACTIVE: |
| 449 | obj->state = ODEBUG_STATE_INACTIVE; |
| 450 | break; |
| 451 | |
| 452 | case ODEBUG_STATE_DESTROYED: |
| 453 | debug_print_object(obj, "deactivate"); |
| 454 | break; |
| 455 | default: |
| 456 | break; |
| 457 | } |
| 458 | } else { |
| 459 | struct debug_obj o = { .object = addr, |
| 460 | .state = ODEBUG_STATE_NOTAVAILABLE, |
| 461 | .descr = descr }; |
| 462 | |
| 463 | debug_print_object(&o, "deactivate"); |
| 464 | } |
| 465 | |
| 466 | spin_unlock_irqrestore(&db->lock, flags); |
| 467 | } |
| 468 | |
| 469 | /** |
| 470 | * debug_object_destroy - debug checks when an object is destroyed |
| 471 | * @addr: address of the object |
| 472 | * @descr: pointer to an object specific debug description structure |
| 473 | */ |
| 474 | void debug_object_destroy(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_NONE: |
| 494 | case ODEBUG_STATE_INIT: |
| 495 | case ODEBUG_STATE_INACTIVE: |
| 496 | obj->state = ODEBUG_STATE_DESTROYED; |
| 497 | break; |
| 498 | case ODEBUG_STATE_ACTIVE: |
| 499 | debug_print_object(obj, "destroy"); |
| 500 | state = obj->state; |
| 501 | spin_unlock_irqrestore(&db->lock, flags); |
| 502 | debug_object_fixup(descr->fixup_destroy, addr, state); |
| 503 | return; |
| 504 | |
| 505 | case ODEBUG_STATE_DESTROYED: |
| 506 | debug_print_object(obj, "destroy"); |
| 507 | break; |
| 508 | default: |
| 509 | break; |
| 510 | } |
| 511 | out_unlock: |
| 512 | spin_unlock_irqrestore(&db->lock, flags); |
| 513 | } |
| 514 | |
| 515 | /** |
| 516 | * debug_object_free - debug checks when an object is freed |
| 517 | * @addr: address of the object |
| 518 | * @descr: pointer to an object specific debug description structure |
| 519 | */ |
| 520 | void debug_object_free(void *addr, struct debug_obj_descr *descr) |
| 521 | { |
| 522 | enum debug_obj_state state; |
| 523 | struct debug_bucket *db; |
| 524 | struct debug_obj *obj; |
| 525 | unsigned long flags; |
| 526 | |
| 527 | if (!debug_objects_enabled) |
| 528 | return; |
| 529 | |
| 530 | db = get_bucket((unsigned long) addr); |
| 531 | |
| 532 | spin_lock_irqsave(&db->lock, flags); |
| 533 | |
| 534 | obj = lookup_object(addr, db); |
| 535 | if (!obj) |
| 536 | goto out_unlock; |
| 537 | |
| 538 | switch (obj->state) { |
| 539 | case ODEBUG_STATE_ACTIVE: |
| 540 | debug_print_object(obj, "free"); |
| 541 | state = obj->state; |
| 542 | spin_unlock_irqrestore(&db->lock, flags); |
| 543 | debug_object_fixup(descr->fixup_free, addr, state); |
| 544 | return; |
| 545 | default: |
| 546 | hlist_del(&obj->node); |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 547 | spin_unlock_irqrestore(&db->lock, flags); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 548 | free_object(obj); |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 549 | return; |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 550 | } |
| 551 | out_unlock: |
| 552 | spin_unlock_irqrestore(&db->lock, flags); |
| 553 | } |
| 554 | |
| 555 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
| 556 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) |
| 557 | { |
| 558 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; |
| 559 | struct hlist_node *node, *tmp; |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 560 | HLIST_HEAD(freelist); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 561 | struct debug_obj_descr *descr; |
| 562 | enum debug_obj_state state; |
| 563 | struct debug_bucket *db; |
| 564 | struct debug_obj *obj; |
| 565 | int cnt; |
| 566 | |
| 567 | saddr = (unsigned long) address; |
| 568 | eaddr = saddr + size; |
| 569 | paddr = saddr & ODEBUG_CHUNK_MASK; |
| 570 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); |
| 571 | chunks >>= ODEBUG_CHUNK_SHIFT; |
| 572 | |
| 573 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { |
| 574 | db = get_bucket(paddr); |
| 575 | |
| 576 | repeat: |
| 577 | cnt = 0; |
| 578 | spin_lock_irqsave(&db->lock, flags); |
| 579 | hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) { |
| 580 | cnt++; |
| 581 | oaddr = (unsigned long) obj->object; |
| 582 | if (oaddr < saddr || oaddr >= eaddr) |
| 583 | continue; |
| 584 | |
| 585 | switch (obj->state) { |
| 586 | case ODEBUG_STATE_ACTIVE: |
| 587 | debug_print_object(obj, "free"); |
| 588 | descr = obj->descr; |
| 589 | state = obj->state; |
| 590 | spin_unlock_irqrestore(&db->lock, flags); |
| 591 | debug_object_fixup(descr->fixup_free, |
| 592 | (void *) oaddr, state); |
| 593 | goto repeat; |
| 594 | default: |
| 595 | hlist_del(&obj->node); |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 596 | hlist_add_head(&obj->node, &freelist); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 597 | break; |
| 598 | } |
| 599 | } |
| 600 | spin_unlock_irqrestore(&db->lock, flags); |
Vegard Nossum | 673d62cc | 2008-08-31 23:39:21 +0200 | [diff] [blame] | 601 | |
| 602 | /* Now free them */ |
| 603 | hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) { |
| 604 | hlist_del(&obj->node); |
| 605 | free_object(obj); |
| 606 | } |
| 607 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 608 | if (cnt > debug_objects_maxchain) |
| 609 | debug_objects_maxchain = cnt; |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | void debug_check_no_obj_freed(const void *address, unsigned long size) |
| 614 | { |
| 615 | if (debug_objects_enabled) |
| 616 | __debug_check_no_obj_freed(address, size); |
| 617 | } |
| 618 | #endif |
| 619 | |
| 620 | #ifdef CONFIG_DEBUG_FS |
| 621 | |
| 622 | static int debug_stats_show(struct seq_file *m, void *v) |
| 623 | { |
| 624 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); |
| 625 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); |
| 626 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); |
| 627 | seq_printf(m, "pool_free :%d\n", obj_pool_free); |
| 628 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); |
| 629 | seq_printf(m, "pool_used :%d\n", obj_pool_used); |
| 630 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | static int debug_stats_open(struct inode *inode, struct file *filp) |
| 635 | { |
| 636 | return single_open(filp, debug_stats_show, NULL); |
| 637 | } |
| 638 | |
| 639 | static const struct file_operations debug_stats_fops = { |
| 640 | .open = debug_stats_open, |
| 641 | .read = seq_read, |
| 642 | .llseek = seq_lseek, |
| 643 | .release = single_release, |
| 644 | }; |
| 645 | |
| 646 | static int __init debug_objects_init_debugfs(void) |
| 647 | { |
| 648 | struct dentry *dbgdir, *dbgstats; |
| 649 | |
| 650 | if (!debug_objects_enabled) |
| 651 | return 0; |
| 652 | |
| 653 | dbgdir = debugfs_create_dir("debug_objects", NULL); |
| 654 | if (!dbgdir) |
| 655 | return -ENOMEM; |
| 656 | |
| 657 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, |
| 658 | &debug_stats_fops); |
| 659 | if (!dbgstats) |
| 660 | goto err; |
| 661 | |
| 662 | return 0; |
| 663 | |
| 664 | err: |
| 665 | debugfs_remove(dbgdir); |
| 666 | |
| 667 | return -ENOMEM; |
| 668 | } |
| 669 | __initcall(debug_objects_init_debugfs); |
| 670 | |
| 671 | #else |
| 672 | static inline void debug_objects_init_debugfs(void) { } |
| 673 | #endif |
| 674 | |
| 675 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST |
| 676 | |
| 677 | /* Random data structure for the self test */ |
| 678 | struct self_test { |
| 679 | unsigned long dummy1[6]; |
| 680 | int static_init; |
| 681 | unsigned long dummy2[3]; |
| 682 | }; |
| 683 | |
| 684 | static __initdata struct debug_obj_descr descr_type_test; |
| 685 | |
| 686 | /* |
| 687 | * fixup_init is called when: |
| 688 | * - an active object is initialized |
| 689 | */ |
| 690 | static int __init fixup_init(void *addr, enum debug_obj_state state) |
| 691 | { |
| 692 | struct self_test *obj = addr; |
| 693 | |
| 694 | switch (state) { |
| 695 | case ODEBUG_STATE_ACTIVE: |
| 696 | debug_object_deactivate(obj, &descr_type_test); |
| 697 | debug_object_init(obj, &descr_type_test); |
| 698 | return 1; |
| 699 | default: |
| 700 | return 0; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * fixup_activate is called when: |
| 706 | * - an active object is activated |
| 707 | * - an unknown object is activated (might be a statically initialized object) |
| 708 | */ |
| 709 | static int __init fixup_activate(void *addr, enum debug_obj_state state) |
| 710 | { |
| 711 | struct self_test *obj = addr; |
| 712 | |
| 713 | switch (state) { |
| 714 | case ODEBUG_STATE_NOTAVAILABLE: |
| 715 | if (obj->static_init == 1) { |
| 716 | debug_object_init(obj, &descr_type_test); |
| 717 | debug_object_activate(obj, &descr_type_test); |
| 718 | /* |
| 719 | * Real code should return 0 here ! This is |
| 720 | * not a fixup of some bad behaviour. We |
| 721 | * merily call the debug_init function to keep |
| 722 | * track of the object. |
| 723 | */ |
| 724 | return 1; |
| 725 | } else { |
| 726 | /* Real code needs to emit a warning here */ |
| 727 | } |
| 728 | return 0; |
| 729 | |
| 730 | case ODEBUG_STATE_ACTIVE: |
| 731 | debug_object_deactivate(obj, &descr_type_test); |
| 732 | debug_object_activate(obj, &descr_type_test); |
| 733 | return 1; |
| 734 | |
| 735 | default: |
| 736 | return 0; |
| 737 | } |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * fixup_destroy is called when: |
| 742 | * - an active object is destroyed |
| 743 | */ |
| 744 | static int __init fixup_destroy(void *addr, enum debug_obj_state state) |
| 745 | { |
| 746 | struct self_test *obj = addr; |
| 747 | |
| 748 | switch (state) { |
| 749 | case ODEBUG_STATE_ACTIVE: |
| 750 | debug_object_deactivate(obj, &descr_type_test); |
| 751 | debug_object_destroy(obj, &descr_type_test); |
| 752 | return 1; |
| 753 | default: |
| 754 | return 0; |
| 755 | } |
| 756 | } |
| 757 | |
| 758 | /* |
| 759 | * fixup_free is called when: |
| 760 | * - an active object is freed |
| 761 | */ |
| 762 | static int __init fixup_free(void *addr, enum debug_obj_state state) |
| 763 | { |
| 764 | struct self_test *obj = addr; |
| 765 | |
| 766 | switch (state) { |
| 767 | case ODEBUG_STATE_ACTIVE: |
| 768 | debug_object_deactivate(obj, &descr_type_test); |
| 769 | debug_object_free(obj, &descr_type_test); |
| 770 | return 1; |
| 771 | default: |
| 772 | return 0; |
| 773 | } |
| 774 | } |
| 775 | |
| 776 | static int |
| 777 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
| 778 | { |
| 779 | struct debug_bucket *db; |
| 780 | struct debug_obj *obj; |
| 781 | unsigned long flags; |
| 782 | int res = -EINVAL; |
| 783 | |
| 784 | db = get_bucket((unsigned long) addr); |
| 785 | |
| 786 | spin_lock_irqsave(&db->lock, flags); |
| 787 | |
| 788 | obj = lookup_object(addr, db); |
| 789 | if (!obj && state != ODEBUG_STATE_NONE) { |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 790 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 791 | goto out; |
| 792 | } |
| 793 | if (obj && obj->state != state) { |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 794 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 795 | obj->state, state); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 796 | goto out; |
| 797 | } |
| 798 | if (fixups != debug_objects_fixups) { |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 799 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 800 | fixups, debug_objects_fixups); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 801 | goto out; |
| 802 | } |
| 803 | if (warnings != debug_objects_warnings) { |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 804 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 805 | warnings, debug_objects_warnings); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 806 | goto out; |
| 807 | } |
| 808 | res = 0; |
| 809 | out: |
| 810 | spin_unlock_irqrestore(&db->lock, flags); |
| 811 | if (res) |
| 812 | debug_objects_enabled = 0; |
| 813 | return res; |
| 814 | } |
| 815 | |
| 816 | static __initdata struct debug_obj_descr descr_type_test = { |
| 817 | .name = "selftest", |
| 818 | .fixup_init = fixup_init, |
| 819 | .fixup_activate = fixup_activate, |
| 820 | .fixup_destroy = fixup_destroy, |
| 821 | .fixup_free = fixup_free, |
| 822 | }; |
| 823 | |
| 824 | static __initdata struct self_test obj = { .static_init = 0 }; |
| 825 | |
| 826 | static void __init debug_objects_selftest(void) |
| 827 | { |
| 828 | int fixups, oldfixups, warnings, oldwarnings; |
| 829 | unsigned long flags; |
| 830 | |
| 831 | local_irq_save(flags); |
| 832 | |
| 833 | fixups = oldfixups = debug_objects_fixups; |
| 834 | warnings = oldwarnings = debug_objects_warnings; |
| 835 | descr_test = &descr_type_test; |
| 836 | |
| 837 | debug_object_init(&obj, &descr_type_test); |
| 838 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) |
| 839 | goto out; |
| 840 | debug_object_activate(&obj, &descr_type_test); |
| 841 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
| 842 | goto out; |
| 843 | debug_object_activate(&obj, &descr_type_test); |
| 844 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) |
| 845 | goto out; |
| 846 | debug_object_deactivate(&obj, &descr_type_test); |
| 847 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) |
| 848 | goto out; |
| 849 | debug_object_destroy(&obj, &descr_type_test); |
| 850 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) |
| 851 | goto out; |
| 852 | debug_object_init(&obj, &descr_type_test); |
| 853 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) |
| 854 | goto out; |
| 855 | debug_object_activate(&obj, &descr_type_test); |
| 856 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) |
| 857 | goto out; |
| 858 | debug_object_deactivate(&obj, &descr_type_test); |
| 859 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) |
| 860 | goto out; |
| 861 | debug_object_free(&obj, &descr_type_test); |
| 862 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) |
| 863 | goto out; |
| 864 | |
| 865 | obj.static_init = 1; |
| 866 | debug_object_activate(&obj, &descr_type_test); |
| 867 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, warnings)) |
| 868 | goto out; |
| 869 | debug_object_init(&obj, &descr_type_test); |
| 870 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) |
| 871 | goto out; |
| 872 | debug_object_free(&obj, &descr_type_test); |
| 873 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) |
| 874 | goto out; |
| 875 | |
| 876 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
| 877 | debug_object_init(&obj, &descr_type_test); |
| 878 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) |
| 879 | goto out; |
| 880 | debug_object_activate(&obj, &descr_type_test); |
| 881 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
| 882 | goto out; |
| 883 | __debug_check_no_obj_freed(&obj, sizeof(obj)); |
| 884 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) |
| 885 | goto out; |
| 886 | #endif |
| 887 | printk(KERN_INFO "ODEBUG: selftest passed\n"); |
| 888 | |
| 889 | out: |
| 890 | debug_objects_fixups = oldfixups; |
| 891 | debug_objects_warnings = oldwarnings; |
| 892 | descr_test = NULL; |
| 893 | |
| 894 | local_irq_restore(flags); |
| 895 | } |
| 896 | #else |
| 897 | static inline void debug_objects_selftest(void) { } |
| 898 | #endif |
| 899 | |
| 900 | /* |
| 901 | * Called during early boot to initialize the hash buckets and link |
| 902 | * the static object pool objects into the poll list. After this call |
| 903 | * the object tracker is fully operational. |
| 904 | */ |
| 905 | void __init debug_objects_early_init(void) |
| 906 | { |
| 907 | int i; |
| 908 | |
| 909 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) |
| 910 | spin_lock_init(&obj_hash[i].lock); |
| 911 | |
| 912 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) |
| 913 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); |
| 914 | } |
| 915 | |
| 916 | /* |
Thomas Gleixner | 1be1cb7 | 2009-03-16 18:53:18 +0100 | [diff] [blame] | 917 | * Convert the statically allocated objects to dynamic ones: |
| 918 | */ |
| 919 | static int debug_objects_replace_static_objects(void) |
| 920 | { |
| 921 | struct debug_bucket *db = obj_hash; |
| 922 | struct hlist_node *node, *tmp; |
| 923 | struct debug_obj *obj, *new; |
| 924 | HLIST_HEAD(objects); |
| 925 | int i, cnt = 0; |
| 926 | |
| 927 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { |
| 928 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); |
| 929 | if (!obj) |
| 930 | goto free; |
| 931 | hlist_add_head(&obj->node, &objects); |
| 932 | } |
| 933 | |
| 934 | /* |
| 935 | * When debug_objects_mem_init() is called we know that only |
| 936 | * one CPU is up, so disabling interrupts is enough |
| 937 | * protection. This avoids the lockdep hell of lock ordering. |
| 938 | */ |
| 939 | local_irq_disable(); |
| 940 | |
| 941 | /* Remove the statically allocated objects from the pool */ |
| 942 | hlist_for_each_entry_safe(obj, node, tmp, &obj_pool, node) |
| 943 | hlist_del(&obj->node); |
| 944 | /* Move the allocated objects to the pool */ |
| 945 | hlist_move_list(&objects, &obj_pool); |
| 946 | |
| 947 | /* Replace the active object references */ |
| 948 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { |
| 949 | hlist_move_list(&db->list, &objects); |
| 950 | |
| 951 | hlist_for_each_entry(obj, node, &objects, node) { |
| 952 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
| 953 | hlist_del(&new->node); |
| 954 | /* copy object data */ |
| 955 | *new = *obj; |
| 956 | hlist_add_head(&new->node, &db->list); |
| 957 | cnt++; |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | printk(KERN_DEBUG "ODEBUG: %d of %d active objects replaced\n", cnt, |
| 962 | obj_pool_used); |
| 963 | local_irq_enable(); |
| 964 | return 0; |
| 965 | free: |
| 966 | hlist_for_each_entry_safe(obj, node, tmp, &objects, node) { |
| 967 | hlist_del(&obj->node); |
| 968 | kmem_cache_free(obj_cache, obj); |
| 969 | } |
| 970 | return -ENOMEM; |
| 971 | } |
| 972 | |
| 973 | /* |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 974 | * Called after the kmem_caches are functional to setup a dedicated |
| 975 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag |
| 976 | * prevents that the debug code is called on kmem_cache_free() for the |
| 977 | * debug tracker objects to avoid recursive calls. |
| 978 | */ |
| 979 | void __init debug_objects_mem_init(void) |
| 980 | { |
| 981 | if (!debug_objects_enabled) |
| 982 | return; |
| 983 | |
| 984 | obj_cache = kmem_cache_create("debug_objects_cache", |
| 985 | sizeof (struct debug_obj), 0, |
| 986 | SLAB_DEBUG_OBJECTS, NULL); |
| 987 | |
Thomas Gleixner | 1be1cb7 | 2009-03-16 18:53:18 +0100 | [diff] [blame] | 988 | if (!obj_cache || debug_objects_replace_static_objects()) { |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 989 | debug_objects_enabled = 0; |
Thomas Gleixner | 1be1cb7 | 2009-03-16 18:53:18 +0100 | [diff] [blame] | 990 | if (obj_cache) |
| 991 | kmem_cache_destroy(obj_cache); |
| 992 | printk(KERN_WARNING "ODEBUG: out of memory.\n"); |
| 993 | } else |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 994 | debug_objects_selftest(); |
| 995 | } |