/* * Generic infrastructure for lifetime debugging of objects. * * Started by Thomas Gleixner * * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de> * * For licencing details see kernel-base/COPYING */#include <linux/debugobjects.h>#include <linux/interrupt.h>#include <linux/sched.h>#include <linux/seq_file.h>#include <linux/debugfs.h>#include <linux/slab.h>#include <linux/hash.h> #define ODEBUG_HASH_BITS 14#define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) #define ODEBUG_POOL_SIZE 512#define ODEBUG_POOL_MIN_LEVEL 256 #define ODEBUG_CHUNK_SHIFT PAGE_SHIFT#define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT)#define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) struct debug_bucket { struct hlist_head list; raw_spinlock_t lock;}; static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; static DEFINE_RAW_SPINLOCK(pool_lock); static HLIST_HEAD(obj_pool); static int obj_pool_min_free = ODEBUG_POOL_SIZE;static int obj_pool_free = ODEBUG_POOL_SIZE;static int obj_pool_used;static int obj_pool_max_used;static struct kmem_cache *obj_cache; static int debug_objects_maxchain __read_mostly;static int debug_objects_fixups __read_mostly;static int debug_objects_warnings __read_mostly;static int debug_objects_enabled __read_mostly = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; static struct debug_obj_descr *descr_test __read_mostly; static void free_obj_work(struct work_struct *work);static DECLARE_WORK(debug_obj_work, free_obj_work); static int __init enable_object_debug(char *str){ debug_objects_enabled = 1; return 0;} static int __init disable_object_debug(char *str){ debug_objects_enabled = 0; return 0;} early_param("debug_objects", enable_object_debug);early_param("no_debug_objects", disable_object_debug); static const char *obj_states[ODEBUG_STATE_MAX] = { [ODEBUG_STATE_NONE] = "none", [ODEBUG_STATE_INIT] = "initialized", [ODEBUG_STATE_INACTIVE] = "inactive", [ODEBUG_STATE_ACTIVE] = "active", [ODEBUG_STATE_DESTROYED] = "destroyed", [ODEBUG_STATE_NOTAVAILABLE] = "not available",}; static int fill_pool(void){ gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; struct debug_obj *new; unsigned long flags; if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL)) return obj_pool_free; if (unlikely(!obj_cache)) return obj_pool_free; while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) { new = kmem_cache_zalloc(obj_cache, gfp); if (!new) return obj_pool_free; raw_spin_lock_irqsave(&pool_lock, flags); hlist_add_head(&new->node, &obj_pool); obj_pool_free++; raw_spin_unlock_irqrestore(&pool_lock, flags); } return obj_pool_free;} /* * Lookup an object in the hash bucket. */static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b){ struct hlist_node *node; struct debug_obj *obj; int cnt = 0; hlist_for_each_entry(obj, node, &b->list, node) { cnt++; if (obj->object == addr) return obj; } if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; return NULL;} /* * Allocate a new object. If the pool is empty, switch off the debugger. * Must be called with interrupts disabled. */static struct debug_obj *alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr){ struct debug_obj *obj = NULL; raw_spin_lock(&pool_lock); if (obj_pool.first) { obj = hlist_entry(obj_pool.first, typeof(*obj), node); obj->object = addr; obj->descr = descr; obj->state = ODEBUG_STATE_NONE; obj->astate = 0; hlist_del(&obj->node); hlist_add_head(&obj->node, &b->list); obj_pool_used++; if (obj_pool_used > obj_pool_max_used) obj_pool_max_used = obj_pool_used; obj_pool_free--; if (obj_pool_free < obj_pool_min_free) obj_pool_min_free = obj_pool_free; } raw_spin_unlock(&pool_lock); return obj;} /* * workqueue function to free objects. */static void free_obj_work(struct work_struct *work){ struct debug_obj *obj; unsigned long flags; raw_spin_lock_irqsave(&pool_lock, flags); while (obj_pool_free > ODEBUG_POOL_SIZE) { obj = hlist_entry(obj_pool.first, typeof(*obj), node); hlist_del(&obj->node); obj_pool_free--; /* * We release pool_lock across kmem_cache_free() to * avoid contention on pool_lock. */ raw_spin_unlock_irqrestore(&pool_lock, flags); kmem_cache_free(obj_cache, obj); raw_spin_lock_irqsave(&pool_lock, flags); } raw_spin_unlock_irqrestore(&pool_lock, flags);} /* * Put the object back into the pool and schedule work to free objects * if necessary. */static void free_object(struct debug_obj *obj){ unsigned long flags; int sched = 0; raw_spin_lock_irqsave(&pool_lock, flags); /* * schedule work when the pool is filled and the cache is * initialized: */ if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache) sched = keventd_up() && !work_pending(&debug_obj_work); hlist_add_head(&obj->node, &obj_pool); obj_pool_free++; obj_pool_used--; raw_spin_unlock_irqrestore(&pool_lock, flags); if (sched) schedule_work(&debug_obj_work);} /* * We run out of memory. That means we probably have tons of objects * allocated. */static void debug_objects_oom(void){ struct debug_bucket *db = obj_hash; struct hlist_node *node, *tmp; HLIST_HEAD(freelist); struct debug_obj *obj; unsigned long flags; int i; printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n"); for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { raw_spin_lock_irqsave(&db->lock, flags); hlist_move_list(&db->list, &freelist); raw_spin_unlock_irqrestore(&db->lock, flags); /* Now free them */ hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) { hlist_del(&obj->node); free_object(obj); } }} /* * We use the pfn of the address for the hash. That way we can check * for freed objects simply by checking the affected bucket. */static struct debug_bucket *get_bucket(unsigned long addr){ unsigned long hash; hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); return &obj_hash[hash];} static void debug_print_object(struct debug_obj *obj, char *msg){ struct debug_obj_descr *descr = obj->descr; static int limit; if (limit < 5 && descr != descr_test) { void *hint = descr->debug_hint ? descr->debug_hint(obj->object) : NULL; limit++; WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " "object type: %s hint: %pS\n", msg, obj_states[obj->state], obj->astate, descr->name, hint); } debug_objects_warnings++;} /* * Try to repair the damage, so we have a better chance to get useful * debug output. */static voiddebug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state), void * addr, enum debug_obj_state state){ if (fixup) debug_objects_fixups += fixup(addr, state);} static void debug_object_is_on_stack(void *addr, int onstack){ int is_on_stack; static int limit; if (limit > 4) return; is_on_stack = object_is_on_stack(addr); if (is_on_stack == onstack) return; limit++; if (is_on_stack) printk(KERN_WARNING "ODEBUG: object is on stack, but not annotated\n"); else printk(KERN_WARNING "ODEBUG: object is not on stack, but annotated\n"); WARN_ON(1);} static void__debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack){ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; fill_pool(); db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (!obj) { obj = alloc_object(addr, db, descr); if (!obj) { debug_objects_enabled = 0; raw_spin_unlock_irqrestore(&db->lock, flags); debug_objects_oom(); return; } debug_object_is_on_stack(addr, onstack); } switch (obj->state) { case ODEBUG_STATE_NONE: case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_INIT; break; case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "init"); state = obj->state; raw_spin_unlock_irqrestore(&db->lock, flags); debug_object_fixup(descr->fixup_init, addr, state); return; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "init"); break; default: break; } raw_spin_unlock_irqrestore(&db->lock, flags);} /** * debug_object_init - debug checks when an object is initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */void debug_object_init(void *addr, struct debug_obj_descr *descr){ if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 0);} /** * debug_object_init_on_stack - debug checks when an object on stack is * initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr){ if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 1);} /** * debug_object_activate - debug checks when an object is activated * @addr: address of the object * @descr: pointer to an object specific debug description structure */void debug_object_activate(void *addr, struct debug_obj_descr *descr){ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_ACTIVE; break; case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "activate"); state = obj->state; raw_spin_unlock_irqrestore(&db->lock, flags); debug_object_fixup(descr->fixup_activate, addr, state); return; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "activate"); break; default: break; } raw_spin_unlock_irqrestore(&db->lock, flags); return; } raw_spin_unlock_irqrestore(&db->lock, flags); /* * This happens when a static object is activated. We * let the type specific code decide whether this is * true or not. */ debug_object_fixup(descr->fixup_activate, addr, ODEBUG_STATE_NOTAVAILABLE);} /** * debug_object_deactivate - debug checks when an object is deactivated * @addr: address of the object * @descr: pointer to an object specific debug description structure */void debug_object_deactivate(void *addr, struct debug_obj_descr *descr){ struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: case ODEBUG_STATE_ACTIVE: if (!obj->astate) obj->state = ODEBUG_STATE_INACTIVE; else debug_print_object(obj, "deactivate"); break; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "deactivate"); break; default: break; } } else { struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "deactivate"); } raw_spin_unlock_irqrestore(&db->lock, flags);} /** * debug_object_destroy - debug checks when an object is destroyed * @addr: address of the object * @descr: pointer to an object specific debug description structure */void debug_object_destroy(void *addr, struct debug_obj_descr *descr){ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (!obj) goto out_unlock;Lines 1–500 of 1052. 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/* * Generic infrastructure for lifetime debugging of objects. * * Started by Thomas Gleixner * * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de> * * For licencing details see kernel-base/COPYING */ #include <linux/debugobjects.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/seq_file.h> #include <linux/debugfs.h> #include <linux/slab.h> #include <linux/hash.h> #define ODEBUG_HASH_BITS 14 #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) #define ODEBUG_POOL_SIZE 512 #define ODEBUG_POOL_MIN_LEVEL 256 #define ODEBUG_CHUNK_SHIFT PAGE_SHIFT #define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT) #define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) struct debug_bucket { struct hlist_head list; raw_spinlock_t lock; }; static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; static DEFINE_RAW_SPINLOCK(pool_lock); static HLIST_HEAD(obj_pool); static int obj_pool_min_free = ODEBUG_POOL_SIZE; static int obj_pool_free = ODEBUG_POOL_SIZE; static int obj_pool_used; static int obj_pool_max_used; static struct kmem_cache *obj_cache; static int debug_objects_maxchain __read_mostly; static int debug_objects_fixups __read_mostly; static int debug_objects_warnings __read_mostly; static int debug_objects_enabled __read_mostly = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; static struct debug_obj_descr *descr_test __read_mostly; static void free_obj_work(struct work_struct *work); static DECLARE_WORK(debug_obj_work, free_obj_work); static int __init enable_object_debug(char *str) { debug_objects_enabled = 1; return 0; } static int __init disable_object_debug(char *str) { debug_objects_enabled = 0; return 0; } early_param("debug_objects", enable_object_debug); early_param("no_debug_objects", disable_object_debug); static const char *obj_states[ODEBUG_STATE_MAX] = { [ODEBUG_STATE_NONE] = "none", [ODEBUG_STATE_INIT] = "initialized", [ODEBUG_STATE_INACTIVE] = "inactive", [ODEBUG_STATE_ACTIVE] = "active", [ODEBUG_STATE_DESTROYED] = "destroyed", [ODEBUG_STATE_NOTAVAILABLE] = "not available", }; static int fill_pool(void) { gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; struct debug_obj *new; unsigned long flags; if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL)) return obj_pool_free; if (unlikely(!obj_cache)) return obj_pool_free; while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) { new = kmem_cache_zalloc(obj_cache, gfp); if (!new) return obj_pool_free; raw_spin_lock_irqsave(&pool_lock, flags); hlist_add_head(&new->node, &obj_pool); obj_pool_free++; raw_spin_unlock_irqrestore(&pool_lock, flags); } return obj_pool_free; } /* * Lookup an object in the hash bucket. */ static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) { struct hlist_node *node; struct debug_obj *obj; int cnt = 0; hlist_for_each_entry(obj, node, &b->list, node) { cnt++; if (obj->object == addr) return obj; } if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; return NULL; } /* * Allocate a new object. If the pool is empty, switch off the debugger. * Must be called with interrupts disabled. */ static struct debug_obj * alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) { struct debug_obj *obj = NULL; raw_spin_lock(&pool_lock); if (obj_pool.first) { obj = hlist_entry(obj_pool.first, typeof(*obj), node); obj->object = addr; obj->descr = descr; obj->state = ODEBUG_STATE_NONE; obj->astate = 0; hlist_del(&obj->node); hlist_add_head(&obj->node, &b->list); obj_pool_used++; if (obj_pool_used > obj_pool_max_used) obj_pool_max_used = obj_pool_used; obj_pool_free--; if (obj_pool_free < obj_pool_min_free) obj_pool_min_free = obj_pool_free; } raw_spin_unlock(&pool_lock); return obj; } /* * workqueue function to free objects. */ static void free_obj_work(struct work_struct *work) { struct debug_obj *obj; unsigned long flags; raw_spin_lock_irqsave(&pool_lock, flags); while (obj_pool_free > ODEBUG_POOL_SIZE) { obj = hlist_entry(obj_pool.first, typeof(*obj), node); hlist_del(&obj->node); obj_pool_free--; /* * We release pool_lock across kmem_cache_free() to * avoid contention on pool_lock. */ raw_spin_unlock_irqrestore(&pool_lock, flags); kmem_cache_free(obj_cache, obj); raw_spin_lock_irqsave(&pool_lock, flags); } raw_spin_unlock_irqrestore(&pool_lock, flags); } /* * Put the object back into the pool and schedule work to free objects * if necessary. */ static void free_object(struct debug_obj *obj) { unsigned long flags; int sched = 0; raw_spin_lock_irqsave(&pool_lock, flags); /* * schedule work when the pool is filled and the cache is * initialized: */ if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache) sched = keventd_up() && !work_pending(&debug_obj_work); hlist_add_head(&obj->node, &obj_pool); obj_pool_free++; obj_pool_used--; raw_spin_unlock_irqrestore(&pool_lock, flags); if (sched) schedule_work(&debug_obj_work); } /* * We run out of memory. That means we probably have tons of objects * allocated. */ static void debug_objects_oom(void) { struct debug_bucket *db = obj_hash; struct hlist_node *node, *tmp; HLIST_HEAD(freelist); struct debug_obj *obj; unsigned long flags; int i; printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n"); for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { raw_spin_lock_irqsave(&db->lock, flags); hlist_move_list(&db->list, &freelist); raw_spin_unlock_irqrestore(&db->lock, flags); /* Now free them */ hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) { hlist_del(&obj->node); free_object(obj); } } } /* * We use the pfn of the address for the hash. That way we can check * for freed objects simply by checking the affected bucket. */ static struct debug_bucket *get_bucket(unsigned long addr) { unsigned long hash; hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); return &obj_hash[hash]; } static void debug_print_object(struct debug_obj *obj, char *msg) { struct debug_obj_descr *descr = obj->descr; static int limit; if (limit < 5 && descr != descr_test) { void *hint = descr->debug_hint ? descr->debug_hint(obj->object) : NULL; limit++; WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " "object type: %s hint: %pS\n", msg, obj_states[obj->state], obj->astate, descr->name, hint); } debug_objects_warnings++; } /* * Try to repair the damage, so we have a better chance to get useful * debug output. */ static void debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state), void * addr, enum debug_obj_state state) { if (fixup) debug_objects_fixups += fixup(addr, state); } static void debug_object_is_on_stack(void *addr, int onstack) { int is_on_stack; static int limit; if (limit > 4) return; is_on_stack = object_is_on_stack(addr); if (is_on_stack == onstack) return; limit++; if (is_on_stack) printk(KERN_WARNING "ODEBUG: object is on stack, but not annotated\n"); else printk(KERN_WARNING "ODEBUG: object is not on stack, but annotated\n"); WARN_ON(1); } static void __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) { enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; fill_pool(); db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (!obj) { obj = alloc_object(addr, db, descr); if (!obj) { debug_objects_enabled = 0; raw_spin_unlock_irqrestore(&db->lock, flags); debug_objects_oom(); return; } debug_object_is_on_stack(addr, onstack); } switch (obj->state) { case ODEBUG_STATE_NONE: case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_INIT; break; case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "init"); state = obj->state; raw_spin_unlock_irqrestore(&db->lock, flags); debug_object_fixup(descr->fixup_init, addr, state); return; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "init"); break; default: break; } raw_spin_unlock_irqrestore(&db->lock, flags); } /** * debug_object_init - debug checks when an object is initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_init(void *addr, struct debug_obj_descr *descr) { if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 0); } /** * debug_object_init_on_stack - debug checks when an object on stack is * initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 1); } /** * debug_object_activate - debug checks when an object is activated * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_activate(void *addr, struct debug_obj_descr *descr) { enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_ACTIVE; break; case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "activate"); state = obj->state; raw_spin_unlock_irqrestore(&db->lock, flags); debug_object_fixup(descr->fixup_activate, addr, state); return; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "activate"); break; default: break; } raw_spin_unlock_irqrestore(&db->lock, flags); return; } raw_spin_unlock_irqrestore(&db->lock, flags); /* * This happens when a static object is activated. We * let the type specific code decide whether this is * true or not. */ debug_object_fixup(descr->fixup_activate, addr, ODEBUG_STATE_NOTAVAILABLE); } /** * debug_object_deactivate - debug checks when an object is deactivated * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: case ODEBUG_STATE_ACTIVE: if (!obj->astate) obj->state = ODEBUG_STATE_INACTIVE; else debug_print_object(obj, "deactivate"); break; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "deactivate"); break; default: break; } } else { struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "deactivate"); } raw_spin_unlock_irqrestore(&db->lock, flags); } /** * debug_object_destroy - debug checks when an object is destroyed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_destroy(void *addr, struct debug_obj_descr *descr) { enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (!obj) goto out_unlock;