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lib/debugobjects.c
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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 */ |
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#define pr_fmt(fmt) "ODEBUG: " fmt |
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#include <linux/debugobjects.h> #include <linux/interrupt.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/seq_file.h> #include <linux/debugfs.h> |
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#include <linux/slab.h> |
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#include <linux/hash.h> |
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#include <linux/kmemleak.h> |
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#define ODEBUG_HASH_BITS 14 #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) |
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#define ODEBUG_POOL_SIZE 1024 |
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#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; |
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raw_spinlock_t lock; |
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}; static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; |
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static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; |
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static DEFINE_RAW_SPINLOCK(pool_lock); |
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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; |
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static int debug_objects_enabled __read_mostly = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; |
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static int debug_objects_pool_size __read_mostly = ODEBUG_POOL_SIZE; static int debug_objects_pool_min_level __read_mostly = ODEBUG_POOL_MIN_LEVEL; |
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static struct debug_obj_descr *descr_test __read_mostly; |
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/* |
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* Track numbers of kmem_cache_alloc()/free() calls done. |
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*/ |
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static int debug_objects_allocated; |
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static int debug_objects_freed; |
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static void free_obj_work(struct work_struct *work); static DECLARE_WORK(debug_obj_work, free_obj_work); |
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static int __init enable_object_debug(char *str) { debug_objects_enabled = 1; return 0; } |
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static int __init disable_object_debug(char *str) { debug_objects_enabled = 0; return 0; } |
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early_param("debug_objects", enable_object_debug); |
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early_param("no_debug_objects", disable_object_debug); |
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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", }; |
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static void fill_pool(void) |
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{ gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; struct debug_obj *new; |
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unsigned long flags; |
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|
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if (likely(obj_pool_free >= debug_objects_pool_min_level)) |
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return; |
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if (unlikely(!obj_cache)) |
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return; |
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|
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while (obj_pool_free < debug_objects_pool_min_level) { |
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new = kmem_cache_zalloc(obj_cache, gfp); if (!new) |
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return; |
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|
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raw_spin_lock_irqsave(&pool_lock, flags); |
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hlist_add_head(&new->node, &obj_pool); |
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debug_objects_allocated++; |
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obj_pool_free++; |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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} |
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} /* * Lookup an object in the hash bucket. */ static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) { |
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struct debug_obj *obj; int cnt = 0; |
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hlist_for_each_entry(obj, &b->list, node) { |
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cnt++; if (obj->object == addr) return obj; } if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; return NULL; } /* |
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* Allocate a new object. If the pool is empty, switch off the debugger. |
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* Must be called with interrupts disabled. |
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*/ static struct debug_obj * alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) { struct debug_obj *obj = NULL; |
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|
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raw_spin_lock(&pool_lock); |
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if (obj_pool.first) { obj = hlist_entry(obj_pool.first, typeof(*obj), node); obj->object = addr; obj->descr = descr; obj->state = ODEBUG_STATE_NONE; |
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obj->astate = 0; |
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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; } |
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raw_spin_unlock(&pool_lock); |
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|
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return obj; } /* |
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* workqueue function to free objects. |
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* * To reduce contention on the global pool_lock, the actual freeing of * debug objects will be delayed if the pool_lock is busy. We also free * the objects in a batch of 4 for each lock/unlock cycle. |
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*/ |
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#define ODEBUG_FREE_BATCH 4 |
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static void free_obj_work(struct work_struct *work) |
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{ |
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struct debug_obj *objs[ODEBUG_FREE_BATCH]; |
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unsigned long flags; |
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int i; |
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|
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if (!raw_spin_trylock_irqsave(&pool_lock, flags)) return; while (obj_pool_free >= debug_objects_pool_size + ODEBUG_FREE_BATCH) { for (i = 0; i < ODEBUG_FREE_BATCH; i++) { objs[i] = hlist_entry(obj_pool.first, typeof(*objs[0]), node); hlist_del(&objs[i]->node); } obj_pool_free -= ODEBUG_FREE_BATCH; debug_objects_freed += ODEBUG_FREE_BATCH; |
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/* * We release pool_lock across kmem_cache_free() to * avoid contention on pool_lock. */ |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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for (i = 0; i < ODEBUG_FREE_BATCH; i++) kmem_cache_free(obj_cache, objs[i]); if (!raw_spin_trylock_irqsave(&pool_lock, flags)) return; |
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} |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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} /* * 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; |
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raw_spin_lock_irqsave(&pool_lock, flags); |
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/* * schedule work when the pool is filled and the cache is * initialized: */ |
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if (obj_pool_free > debug_objects_pool_size && obj_cache) |
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sched = 1; |
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hlist_add_head(&obj->node, &obj_pool); obj_pool_free++; obj_pool_used--; |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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if (sched) schedule_work(&debug_obj_work); |
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} /* * 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; |
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struct hlist_node *tmp; |
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HLIST_HEAD(freelist); |
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struct debug_obj *obj; unsigned long flags; int i; |
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pr_warn("Out of memory. ODEBUG disabled "); |
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for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { |
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raw_spin_lock_irqsave(&db->lock, flags); |
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hlist_move_list(&db->list, &freelist); |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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/* Now free them */ |
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hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
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hlist_del(&obj->node); free_object(obj); } |
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} } /* * 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) { |
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struct debug_obj_descr *descr = obj->descr; |
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static int limit; |
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if (limit < 5 && descr != descr_test) { void *hint = descr->debug_hint ? descr->debug_hint(obj->object) : NULL; |
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limit++; |
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WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
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"object type: %s hint: %pS ", |
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msg, obj_states[obj->state], obj->astate, |
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descr->name, hint); |
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} debug_objects_warnings++; } /* * Try to repair the damage, so we have a better chance to get useful * debug output. */ |
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static bool debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), |
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void * addr, enum debug_obj_state state) { |
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if (fixup && fixup(addr, state)) { debug_objects_fixups++; return true; } return false; |
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} static void debug_object_is_on_stack(void *addr, int onstack) { |
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int is_on_stack; static int limit; if (limit > 4) return; |
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is_on_stack = object_is_on_stack(addr); |
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if (is_on_stack == onstack) return; limit++; if (is_on_stack) |
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pr_warn("object %p is on stack %p, but NOT annotated. ", addr, task_stack_page(current)); |
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else |
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pr_warn("object %p is NOT on stack %p, but annotated. ", addr, task_stack_page(current)); |
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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; |
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fill_pool(); |
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db = get_bucket((unsigned long) addr); |
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raw_spin_lock_irqsave(&db->lock, flags); |
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obj = lookup_object(addr, db); if (!obj) { obj = alloc_object(addr, db, descr); if (!obj) { debug_objects_enabled = 0; |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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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; |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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debug_object_fixup(descr->fixup_init, addr, state); return; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "init"); break; default: break; } |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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} /** * 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); } |
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EXPORT_SYMBOL_GPL(debug_object_init); |
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/** * 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); } |
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EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
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/** * debug_object_activate - debug checks when an object is activated * @addr: address of the object * @descr: pointer to an object specific debug description structure |
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* Returns 0 for success, -EINVAL for check failed. |
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*/ |
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int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
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{ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
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int ret; |
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struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; |
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if (!debug_objects_enabled) |
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return 0; |
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db = get_bucket((unsigned long) addr); |
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raw_spin_lock_irqsave(&db->lock, flags); |
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obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_ACTIVE; |
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ret = 0; |
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break; case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "activate"); state = obj->state; |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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ret = debug_object_fixup(descr->fixup_activate, addr, state); |
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return ret ? 0 : -EINVAL; |
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case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "activate"); |
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ret = -EINVAL; |
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break; default: |
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ret = 0; |
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break; } |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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return ret; |
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} |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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/* |
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* We are here when a static object is activated. We * let the type specific code confirm whether this is * true or not. if true, we just make sure that the * static object is tracked in the object tracker. If * not, this must be a bug, so we try to fix it up. |
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*/ |
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if (descr->is_static_object && descr->is_static_object(addr)) { /* track this static object */ debug_object_init(addr, descr); debug_object_activate(addr, descr); } else { |
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debug_print_object(&o, "activate"); |
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ret = debug_object_fixup(descr->fixup_activate, addr, ODEBUG_STATE_NOTAVAILABLE); return ret ? 0 : -EINVAL; |
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} return 0; |
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} |
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EXPORT_SYMBOL_GPL(debug_object_activate); |
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/** * 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); |
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raw_spin_lock_irqsave(&db->lock, flags); |
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obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: case ODEBUG_STATE_ACTIVE: |
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if (!obj->astate) obj->state = ODEBUG_STATE_INACTIVE; else debug_print_object(obj, "deactivate"); |
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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"); } |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(debug_object_deactivate); |
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/** * 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); |
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raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
532 533 534 535 536 537 538 539 540 541 542 543 544 545 |
obj = lookup_object(addr, db); if (!obj) goto out_unlock; switch (obj->state) { case ODEBUG_STATE_NONE: case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_DESTROYED; break; case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "destroy"); state = obj->state; |
aef9cb052 debugobjects: Con... |
546 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
547 548 549 550 551 552 553 554 555 556 |
debug_object_fixup(descr->fixup_destroy, addr, state); return; case ODEBUG_STATE_DESTROYED: debug_print_object(obj, "destroy"); break; default: break; } out_unlock: |
aef9cb052 debugobjects: Con... |
557 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
558 |
} |
f8ff04e2b lib/debugobjects:... |
559 |
EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a4 infrastructure to... |
560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 |
/** * debug_object_free - debug checks when an object is freed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_free(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); |
aef9cb052 debugobjects: Con... |
577 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
578 579 580 581 582 583 584 585 586 |
obj = lookup_object(addr, db); if (!obj) goto out_unlock; switch (obj->state) { case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "free"); state = obj->state; |
aef9cb052 debugobjects: Con... |
587 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
588 589 590 591 |
debug_object_fixup(descr->fixup_free, addr, state); return; default: hlist_del(&obj->node); |
aef9cb052 debugobjects: Con... |
592 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
593 |
free_object(obj); |
673d62cc5 debugobjects: fix... |
594 |
return; |
3ac7fe5a4 infrastructure to... |
595 596 |
} out_unlock: |
aef9cb052 debugobjects: Con... |
597 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
598 |
} |
f8ff04e2b lib/debugobjects:... |
599 |
EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a4 infrastructure to... |
600 |
|
a5d8e467f Debugobjects tran... |
601 |
/** |
b84d435cc debugobjects: Ext... |
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 |
* debug_object_assert_init - debug checks when object should be init-ed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_assert_init(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) { struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; raw_spin_unlock_irqrestore(&db->lock, flags); /* |
b9fdac7f6 debugobjects: ins... |
627 628 629 |
* Maybe the object is static, and we let the type specific * code confirm. Track this static object if true, else invoke * fixup. |
b84d435cc debugobjects: Ext... |
630 |
*/ |
b9fdac7f6 debugobjects: ins... |
631 632 633 634 |
if (descr->is_static_object && descr->is_static_object(addr)) { /* Track this static object */ debug_object_init(addr, descr); } else { |
b84d435cc debugobjects: Ext... |
635 |
debug_print_object(&o, "assert_init"); |
b9fdac7f6 debugobjects: ins... |
636 637 638 |
debug_object_fixup(descr->fixup_assert_init, addr, ODEBUG_STATE_NOTAVAILABLE); } |
b84d435cc debugobjects: Ext... |
639 640 641 642 643 |
return; } raw_spin_unlock_irqrestore(&db->lock, flags); } |
f8ff04e2b lib/debugobjects:... |
644 |
EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435cc debugobjects: Ext... |
645 646 |
/** |
a5d8e467f Debugobjects tran... |
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 |
* debug_object_active_state - debug checks object usage state machine * @addr: address of the object * @descr: pointer to an object specific debug description structure * @expect: expected state * @next: state to move to if expected state is found */ void debug_object_active_state(void *addr, struct debug_obj_descr *descr, unsigned int expect, unsigned int next) { 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_ACTIVE: if (obj->astate == expect) obj->astate = next; else debug_print_object(obj, "active_state"); break; default: debug_print_object(obj, "active_state"); break; } } else { struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "active_state"); } raw_spin_unlock_irqrestore(&db->lock, flags); } |
f8ff04e2b lib/debugobjects:... |
692 |
EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467f Debugobjects tran... |
693 |
|
3ac7fe5a4 infrastructure to... |
694 695 696 697 |
#ifdef CONFIG_DEBUG_OBJECTS_FREE static void __debug_check_no_obj_freed(const void *address, unsigned long size) { unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; |
b67bfe0d4 hlist: drop the n... |
698 |
struct hlist_node *tmp; |
673d62cc5 debugobjects: fix... |
699 |
HLIST_HEAD(freelist); |
3ac7fe5a4 infrastructure to... |
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 |
struct debug_obj_descr *descr; enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; int cnt; saddr = (unsigned long) address; eaddr = saddr + size; paddr = saddr & ODEBUG_CHUNK_MASK; chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); chunks >>= ODEBUG_CHUNK_SHIFT; for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { db = get_bucket(paddr); repeat: cnt = 0; |
aef9cb052 debugobjects: Con... |
717 |
raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d4 hlist: drop the n... |
718 |
hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a4 infrastructure to... |
719 720 721 722 723 724 725 726 727 728 |
cnt++; oaddr = (unsigned long) obj->object; if (oaddr < saddr || oaddr >= eaddr) continue; switch (obj->state) { case ODEBUG_STATE_ACTIVE: debug_print_object(obj, "free"); descr = obj->descr; state = obj->state; |
aef9cb052 debugobjects: Con... |
729 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
730 731 732 733 734 |
debug_object_fixup(descr->fixup_free, (void *) oaddr, state); goto repeat; default: hlist_del(&obj->node); |
673d62cc5 debugobjects: fix... |
735 |
hlist_add_head(&obj->node, &freelist); |
3ac7fe5a4 infrastructure to... |
736 737 738 |
break; } } |
aef9cb052 debugobjects: Con... |
739 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc5 debugobjects: fix... |
740 741 |
/* Now free them */ |
b67bfe0d4 hlist: drop the n... |
742 |
hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
673d62cc5 debugobjects: fix... |
743 744 745 |
hlist_del(&obj->node); free_object(obj); } |
3ac7fe5a4 infrastructure to... |
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 |
if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; } } void debug_check_no_obj_freed(const void *address, unsigned long size) { if (debug_objects_enabled) __debug_check_no_obj_freed(address, size); } #endif #ifdef CONFIG_DEBUG_FS static int debug_stats_show(struct seq_file *m, void *v) { seq_printf(m, "max_chain :%d ", debug_objects_maxchain); seq_printf(m, "warnings :%d ", debug_objects_warnings); seq_printf(m, "fixups :%d ", debug_objects_fixups); seq_printf(m, "pool_free :%d ", obj_pool_free); seq_printf(m, "pool_min_free :%d ", obj_pool_min_free); seq_printf(m, "pool_used :%d ", obj_pool_used); seq_printf(m, "pool_max_used :%d ", obj_pool_max_used); |
0cad93c34 debugobjects: Imp... |
776 777 778 779 |
seq_printf(m, "objs_allocated:%d ", debug_objects_allocated); seq_printf(m, "objs_freed :%d ", debug_objects_freed); |
3ac7fe5a4 infrastructure to... |
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 |
return 0; } static int debug_stats_open(struct inode *inode, struct file *filp) { return single_open(filp, debug_stats_show, NULL); } static const struct file_operations debug_stats_fops = { .open = debug_stats_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __init debug_objects_init_debugfs(void) { struct dentry *dbgdir, *dbgstats; if (!debug_objects_enabled) return 0; dbgdir = debugfs_create_dir("debug_objects", NULL); if (!dbgdir) return -ENOMEM; dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, &debug_stats_fops); if (!dbgstats) goto err; return 0; err: debugfs_remove(dbgdir); return -ENOMEM; } __initcall(debug_objects_init_debugfs); #else static inline void debug_objects_init_debugfs(void) { } #endif #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST /* Random data structure for the self test */ struct self_test { unsigned long dummy1[6]; int static_init; unsigned long dummy2[3]; }; static __initdata struct debug_obj_descr descr_type_test; |
b9fdac7f6 debugobjects: ins... |
834 835 836 837 838 839 |
static bool __init is_static_object(void *addr) { struct self_test *obj = addr; return obj->static_init; } |
3ac7fe5a4 infrastructure to... |
840 841 842 843 |
/* * fixup_init is called when: * - an active object is initialized */ |
b1e4d9d82 debugobjects: mak... |
844 |
static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
845 846 847 848 849 850 851 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_init(obj, &descr_type_test); |
b1e4d9d82 debugobjects: mak... |
852 |
return true; |
3ac7fe5a4 infrastructure to... |
853 |
default: |
b1e4d9d82 debugobjects: mak... |
854 |
return false; |
3ac7fe5a4 infrastructure to... |
855 856 857 858 859 860 |
} } /* * fixup_activate is called when: * - an active object is activated |
b9fdac7f6 debugobjects: ins... |
861 |
* - an unknown non-static object is activated |
3ac7fe5a4 infrastructure to... |
862 |
*/ |
b1e4d9d82 debugobjects: mak... |
863 |
static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
864 865 866 867 868 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_NOTAVAILABLE: |
b1e4d9d82 debugobjects: mak... |
869 |
return true; |
3ac7fe5a4 infrastructure to... |
870 871 872 |
case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_activate(obj, &descr_type_test); |
b1e4d9d82 debugobjects: mak... |
873 |
return true; |
3ac7fe5a4 infrastructure to... |
874 875 |
default: |
b1e4d9d82 debugobjects: mak... |
876 |
return false; |
3ac7fe5a4 infrastructure to... |
877 878 879 880 881 882 883 |
} } /* * fixup_destroy is called when: * - an active object is destroyed */ |
b1e4d9d82 debugobjects: mak... |
884 |
static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
885 886 887 888 889 890 891 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_destroy(obj, &descr_type_test); |
b1e4d9d82 debugobjects: mak... |
892 |
return true; |
3ac7fe5a4 infrastructure to... |
893 |
default: |
b1e4d9d82 debugobjects: mak... |
894 |
return false; |
3ac7fe5a4 infrastructure to... |
895 896 897 898 899 900 901 |
} } /* * fixup_free is called when: * - an active object is freed */ |
b1e4d9d82 debugobjects: mak... |
902 |
static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
903 904 905 906 907 908 909 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_free(obj, &descr_type_test); |
b1e4d9d82 debugobjects: mak... |
910 |
return true; |
3ac7fe5a4 infrastructure to... |
911 |
default: |
b1e4d9d82 debugobjects: mak... |
912 |
return false; |
3ac7fe5a4 infrastructure to... |
913 914 |
} } |
1fb2f77c0 debugobjects: Sec... |
915 |
static int __init |
3ac7fe5a4 infrastructure to... |
916 917 918 919 920 921 922 923 |
check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; int res = -EINVAL; db = get_bucket((unsigned long) addr); |
aef9cb052 debugobjects: Con... |
924 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
925 926 927 |
obj = lookup_object(addr, db); if (!obj && state != ODEBUG_STATE_NONE) { |
5cd2b459d Use WARN() in lib/ |
928 929 |
WARN(1, KERN_ERR "ODEBUG: selftest object not found "); |
3ac7fe5a4 infrastructure to... |
930 931 932 |
goto out; } if (obj && obj->state != state) { |
5cd2b459d Use WARN() in lib/ |
933 934 |
WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d ", |
3ac7fe5a4 infrastructure to... |
935 |
obj->state, state); |
3ac7fe5a4 infrastructure to... |
936 937 938 |
goto out; } if (fixups != debug_objects_fixups) { |
5cd2b459d Use WARN() in lib/ |
939 940 |
WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d ", |
3ac7fe5a4 infrastructure to... |
941 |
fixups, debug_objects_fixups); |
3ac7fe5a4 infrastructure to... |
942 943 944 |
goto out; } if (warnings != debug_objects_warnings) { |
5cd2b459d Use WARN() in lib/ |
945 946 |
WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d ", |
3ac7fe5a4 infrastructure to... |
947 |
warnings, debug_objects_warnings); |
3ac7fe5a4 infrastructure to... |
948 949 950 951 |
goto out; } res = 0; out: |
aef9cb052 debugobjects: Con... |
952 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
953 954 955 956 957 958 959 |
if (res) debug_objects_enabled = 0; return res; } static __initdata struct debug_obj_descr descr_type_test = { .name = "selftest", |
b9fdac7f6 debugobjects: ins... |
960 |
.is_static_object = is_static_object, |
3ac7fe5a4 infrastructure to... |
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 |
.fixup_init = fixup_init, .fixup_activate = fixup_activate, .fixup_destroy = fixup_destroy, .fixup_free = fixup_free, }; static __initdata struct self_test obj = { .static_init = 0 }; static void __init debug_objects_selftest(void) { int fixups, oldfixups, warnings, oldwarnings; unsigned long flags; local_irq_save(flags); fixups = oldfixups = debug_objects_fixups; warnings = oldwarnings = debug_objects_warnings; descr_test = &descr_type_test; debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) goto out; debug_object_deactivate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) goto out; debug_object_destroy(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) goto out; debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) goto out; debug_object_deactivate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) goto out; debug_object_free(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) goto out; obj.static_init = 1; debug_object_activate(&obj, &descr_type_test); |
9f78ff005 debugobjects: Fix... |
1010 |
if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a4 infrastructure to... |
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
goto out; debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) goto out; debug_object_free(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) goto out; #ifdef CONFIG_DEBUG_OBJECTS_FREE debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) goto out; __debug_check_no_obj_freed(&obj, sizeof(obj)); if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) goto out; #endif |
719e48439 lib/debugobjects.... |
1030 1031 |
pr_info("selftest passed "); |
3ac7fe5a4 infrastructure to... |
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 |
out: debug_objects_fixups = oldfixups; debug_objects_warnings = oldwarnings; descr_test = NULL; local_irq_restore(flags); } #else static inline void debug_objects_selftest(void) { } #endif /* * Called during early boot to initialize the hash buckets and link * the static object pool objects into the poll list. After this call * the object tracker is fully operational. */ void __init debug_objects_early_init(void) { int i; for (i = 0; i < ODEBUG_HASH_SIZE; i++) |
aef9cb052 debugobjects: Con... |
1054 |
raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a4 infrastructure to... |
1055 1056 1057 1058 1059 1060 |
for (i = 0; i < ODEBUG_POOL_SIZE; i++) hlist_add_head(&obj_static_pool[i].node, &obj_pool); } /* |
1be1cb7b4 debugobjects: rep... |
1061 1062 |
* Convert the statically allocated objects to dynamic ones: */ |
1fb2f77c0 debugobjects: Sec... |
1063 |
static int __init debug_objects_replace_static_objects(void) |
1be1cb7b4 debugobjects: rep... |
1064 1065 |
{ struct debug_bucket *db = obj_hash; |
b67bfe0d4 hlist: drop the n... |
1066 |
struct hlist_node *tmp; |
1be1cb7b4 debugobjects: rep... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 |
struct debug_obj *obj, *new; HLIST_HEAD(objects); int i, cnt = 0; for (i = 0; i < ODEBUG_POOL_SIZE; i++) { obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); if (!obj) goto free; hlist_add_head(&obj->node, &objects); } /* * When debug_objects_mem_init() is called we know that only * one CPU is up, so disabling interrupts is enough * protection. This avoids the lockdep hell of lock ordering. */ local_irq_disable(); /* Remove the statically allocated objects from the pool */ |
b67bfe0d4 hlist: drop the n... |
1086 |
hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b4 debugobjects: rep... |
1087 1088 1089 1090 1091 1092 1093 |
hlist_del(&obj->node); /* Move the allocated objects to the pool */ hlist_move_list(&objects, &obj_pool); /* Replace the active object references */ for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { hlist_move_list(&db->list, &objects); |
b67bfe0d4 hlist: drop the n... |
1094 |
hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b4 debugobjects: rep... |
1095 1096 1097 1098 1099 1100 1101 1102 |
new = hlist_entry(obj_pool.first, typeof(*obj), node); hlist_del(&new->node); /* copy object data */ *new = *obj; hlist_add_head(&new->node, &db->list); cnt++; } } |
765a5e0cb debugobjects: pri... |
1103 |
local_irq_enable(); |
1be1cb7b4 debugobjects: rep... |
1104 |
|
c0f35cc0b lib/debugobjects.... |
1105 1106 1107 |
pr_debug("%d of %d active objects replaced ", cnt, obj_pool_used); |
1be1cb7b4 debugobjects: rep... |
1108 1109 |
return 0; free: |
b67bfe0d4 hlist: drop the n... |
1110 |
hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b4 debugobjects: rep... |
1111 1112 1113 1114 1115 1116 1117 |
hlist_del(&obj->node); kmem_cache_free(obj_cache, obj); } return -ENOMEM; } /* |
3ac7fe5a4 infrastructure to... |
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 |
* Called after the kmem_caches are functional to setup a dedicated * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag * prevents that the debug code is called on kmem_cache_free() for the * debug tracker objects to avoid recursive calls. */ void __init debug_objects_mem_init(void) { if (!debug_objects_enabled) return; obj_cache = kmem_cache_create("debug_objects_cache", sizeof (struct debug_obj), 0, |
225b11374 debugobjects: avo... |
1130 1131 |
SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, NULL); |
3ac7fe5a4 infrastructure to... |
1132 |
|
1be1cb7b4 debugobjects: rep... |
1133 |
if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a4 infrastructure to... |
1134 |
debug_objects_enabled = 0; |
1be1cb7b4 debugobjects: rep... |
1135 1136 |
if (obj_cache) kmem_cache_destroy(obj_cache); |
719e48439 lib/debugobjects.... |
1137 1138 |
pr_warn("out of memory. "); |
1be1cb7b4 debugobjects: rep... |
1139 |
} else |
3ac7fe5a4 infrastructure to... |
1140 |
debug_objects_selftest(); |
97dd552eb debugobjects: Sca... |
1141 1142 1143 1144 1145 1146 1147 |
/* * Increase the thresholds for allocating and freeing objects * according to the number of possible CPUs available in the system. */ debug_objects_pool_size += num_possible_cpus() * 32; debug_objects_pool_min_level += num_possible_cpus() * 4; |
3ac7fe5a4 infrastructure to... |
1148 |
} |