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lib/debugobjects.c
35.3 KB
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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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#include <linux/cpu.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 |
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#define ODEBUG_POOL_PERCPU_SIZE 64 |
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#define ODEBUG_BATCH_SIZE 16 |
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#define ODEBUG_CHUNK_SHIFT PAGE_SHIFT #define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT) #define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) |
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/* * We limit the freeing of debug objects via workqueue at a maximum * frequency of 10Hz and about 1024 objects for each freeing operation. * So it is freeing at most 10k debug objects per second. */ #define ODEBUG_FREE_WORK_MAX 1024 #define ODEBUG_FREE_WORK_DELAY DIV_ROUND_UP(HZ, 10) |
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struct debug_bucket { struct hlist_head list; |
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raw_spinlock_t lock; |
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}; |
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/* * Debug object percpu free list * Access is protected by disabling irq */ struct debug_percpu_free { struct hlist_head free_objs; int obj_free; }; static DEFINE_PER_CPU(struct debug_percpu_free, percpu_obj_pool); |
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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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|
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static DEFINE_RAW_SPINLOCK(pool_lock); |
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static HLIST_HEAD(obj_pool); |
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static HLIST_HEAD(obj_to_free); |
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|
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/* * Because of the presence of percpu free pools, obj_pool_free will * under-count those in the percpu free pools. Similarly, obj_pool_used * will over-count those in the percpu free pools. Adjustments will be * made at debug_stats_show(). Both obj_pool_min_free and obj_pool_max_used * can be off. */ |
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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; |
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static bool obj_freeing; |
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/* The number of objs on the global free list */ static int obj_nr_tofree; |
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static int debug_objects_maxchain __read_mostly; |
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static int __maybe_unused debug_objects_maxchecked __read_mostly; |
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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 const struct debug_obj_descr *descr_test __read_mostly; |
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static struct kmem_cache *obj_cache __read_mostly; |
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|
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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); |
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static DECLARE_DELAYED_WORK(debug_obj_work, free_obj_work); |
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|
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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; |
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struct debug_obj *obj; |
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unsigned long flags; |
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|
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if (likely(READ_ONCE(obj_pool_free) >= debug_objects_pool_min_level)) |
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return; |
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|
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/* * Reuse objs from the global free list; they will be reinitialized * when allocating. |
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* * Both obj_nr_tofree and obj_pool_free are checked locklessly; the * READ_ONCE()s pair with the WRITE_ONCE()s in pool_lock critical * sections. |
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*/ |
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while (READ_ONCE(obj_nr_tofree) && (READ_ONCE(obj_pool_free) < obj_pool_min_free)) { |
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raw_spin_lock_irqsave(&pool_lock, flags); /* * Recheck with the lock held as the worker thread might have * won the race and freed the global free list already. */ |
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while (obj_nr_tofree && (obj_pool_free < obj_pool_min_free)) { |
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obj = hlist_entry(obj_to_free.first, typeof(*obj), node); hlist_del(&obj->node); |
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree - 1); |
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hlist_add_head(&obj->node, &obj_pool); |
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1); |
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} raw_spin_unlock_irqrestore(&pool_lock, flags); } |
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if (unlikely(!obj_cache)) |
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return; |
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|
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while (READ_ONCE(obj_pool_free) < debug_objects_pool_min_level) { |
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struct debug_obj *new[ODEBUG_BATCH_SIZE]; int cnt; |
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|
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for (cnt = 0; cnt < ODEBUG_BATCH_SIZE; cnt++) { new[cnt] = kmem_cache_zalloc(obj_cache, gfp); if (!new[cnt]) break; } if (!cnt) |
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return; |
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|
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raw_spin_lock_irqsave(&pool_lock, flags); |
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while (cnt) { hlist_add_head(&new[--cnt]->node, &obj_pool); debug_objects_allocated++; |
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1); |
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} |
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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 from the hlist */ static struct debug_obj *__alloc_object(struct hlist_head *list) { struct debug_obj *obj = NULL; if (list->first) { obj = hlist_entry(list->first, typeof(*obj), node); hlist_del(&obj->node); } return obj; } /* |
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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 * |
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alloc_object(void *addr, struct debug_bucket *b, const struct debug_obj_descr *descr) |
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{ |
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struct debug_percpu_free *percpu_pool = this_cpu_ptr(&percpu_obj_pool); |
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struct debug_obj *obj; |
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|
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if (likely(obj_cache)) { |
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obj = __alloc_object(&percpu_pool->free_objs); if (obj) { percpu_pool->obj_free--; goto init_obj; } } |
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|
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raw_spin_lock(&pool_lock); obj = __alloc_object(&obj_pool); if (obj) { |
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obj_pool_used++; |
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WRITE_ONCE(obj_pool_free, obj_pool_free - 1); |
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/* * Looking ahead, allocate one batch of debug objects and * put them into the percpu free pool. */ if (likely(obj_cache)) { int i; for (i = 0; i < ODEBUG_BATCH_SIZE; i++) { struct debug_obj *obj2; obj2 = __alloc_object(&obj_pool); if (!obj2) break; hlist_add_head(&obj2->node, &percpu_pool->free_objs); percpu_pool->obj_free++; obj_pool_used++; |
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WRITE_ONCE(obj_pool_free, obj_pool_free - 1); |
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} } |
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if (obj_pool_used > obj_pool_max_used) obj_pool_max_used = obj_pool_used; |
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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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init_obj: if (obj) { obj->object = addr; obj->descr = descr; obj->state = ODEBUG_STATE_NONE; obj->astate = 0; hlist_add_head(&obj->node, &b->list); } |
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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 |
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* debug objects will be delayed if the pool_lock is busy. |
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*/ |
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static void free_obj_work(struct work_struct *work) |
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{ |
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struct hlist_node *tmp; struct debug_obj *obj; |
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unsigned long flags; |
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HLIST_HEAD(tofree); |
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|
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WRITE_ONCE(obj_freeing, false); |
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if (!raw_spin_trylock_irqsave(&pool_lock, flags)) return; |
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|
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if (obj_pool_free >= debug_objects_pool_size) goto free_objs; |
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/* * The objs on the pool list might be allocated before the work is * run, so recheck if pool list it full or not, if not fill pool |
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* list from the global free list. As it is likely that a workload * may be gearing up to use more and more objects, don't free any * of them until the next round. |
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*/ while (obj_nr_tofree && obj_pool_free < debug_objects_pool_size) { obj = hlist_entry(obj_to_free.first, typeof(*obj), node); hlist_del(&obj->node); hlist_add_head(&obj->node, &obj_pool); |
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1); WRITE_ONCE(obj_nr_tofree, obj_nr_tofree - 1); |
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} |
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raw_spin_unlock_irqrestore(&pool_lock, flags); return; |
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|
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free_objs: |
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/* * Pool list is already full and there are still objs on the free * list. Move remaining free objs to a temporary list to free the * memory outside the pool_lock held region. */ if (obj_nr_tofree) { hlist_move_list(&obj_to_free, &tofree); |
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debug_objects_freed += obj_nr_tofree; |
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WRITE_ONCE(obj_nr_tofree, 0); |
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} |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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hlist_for_each_entry_safe(obj, tmp, &tofree, node) { hlist_del(&obj->node); kmem_cache_free(obj_cache, obj); } |
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} |
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static void __free_object(struct debug_obj *obj) |
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{ |
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struct debug_obj *objs[ODEBUG_BATCH_SIZE]; struct debug_percpu_free *percpu_pool; int lookahead_count = 0; |
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unsigned long flags; |
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bool work; |
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|
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local_irq_save(flags); |
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if (!obj_cache) goto free_to_obj_pool; |
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/* * Try to free it into the percpu pool first. */ percpu_pool = this_cpu_ptr(&percpu_obj_pool); |
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if (percpu_pool->obj_free < ODEBUG_POOL_PERCPU_SIZE) { |
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hlist_add_head(&obj->node, &percpu_pool->free_objs); percpu_pool->obj_free++; local_irq_restore(flags); |
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return; |
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} |
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/* * As the percpu pool is full, look ahead and pull out a batch * of objects from the percpu pool and free them as well. */ for (; lookahead_count < ODEBUG_BATCH_SIZE; lookahead_count++) { objs[lookahead_count] = __alloc_object(&percpu_pool->free_objs); if (!objs[lookahead_count]) break; percpu_pool->obj_free--; } free_to_obj_pool: |
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raw_spin_lock(&pool_lock); |
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work = (obj_pool_free > debug_objects_pool_size) && obj_cache && (obj_nr_tofree < ODEBUG_FREE_WORK_MAX); |
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obj_pool_used--; |
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if (work) { |
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree + 1); |
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hlist_add_head(&obj->node, &obj_to_free); |
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if (lookahead_count) { |
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree + lookahead_count); |
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obj_pool_used -= lookahead_count; while (lookahead_count) { hlist_add_head(&objs[--lookahead_count]->node, &obj_to_free); } } |
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if ((obj_pool_free > debug_objects_pool_size) && (obj_nr_tofree < ODEBUG_FREE_WORK_MAX)) { int i; /* * Free one more batch of objects from obj_pool. */ for (i = 0; i < ODEBUG_BATCH_SIZE; i++) { obj = __alloc_object(&obj_pool); hlist_add_head(&obj->node, &obj_to_free); |
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WRITE_ONCE(obj_pool_free, obj_pool_free - 1); WRITE_ONCE(obj_nr_tofree, obj_nr_tofree + 1); |
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} } |
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} else { |
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1); |
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hlist_add_head(&obj->node, &obj_pool); |
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if (lookahead_count) { |
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WRITE_ONCE(obj_pool_free, obj_pool_free + lookahead_count); |
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obj_pool_used -= lookahead_count; while (lookahead_count) { hlist_add_head(&objs[--lookahead_count]->node, &obj_pool); } } |
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} |
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raw_spin_unlock(&pool_lock); local_irq_restore(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) { |
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__free_object(obj); |
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if (!READ_ONCE(obj_freeing) && READ_ONCE(obj_nr_tofree)) { |
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WRITE_ONCE(obj_freeing, true); schedule_delayed_work(&debug_obj_work, ODEBUG_FREE_WORK_DELAY); } |
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} |
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#ifdef CONFIG_HOTPLUG_CPU static int object_cpu_offline(unsigned int cpu) { struct debug_percpu_free *percpu_pool; struct hlist_node *tmp; struct debug_obj *obj; /* Remote access is safe as the CPU is dead already */ percpu_pool = per_cpu_ptr(&percpu_obj_pool, cpu); hlist_for_each_entry_safe(obj, tmp, &percpu_pool->free_objs, node) { hlist_del(&obj->node); kmem_cache_free(obj_cache, obj); } percpu_pool->obj_free = 0; return 0; } #endif |
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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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454 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc5 debugobjects: fix... |
455 456 |
/* Now free them */ |
b67bfe0d4 hlist: drop the n... |
457 |
hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
3ac7fe5a4 infrastructure to... |
458 459 460 |
hlist_del(&obj->node); free_object(obj); } |
3ac7fe5a4 infrastructure to... |
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 |
} } /* * 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) { |
aedcade6f debugobjects: All... |
478 |
const struct debug_obj_descr *descr = obj->descr; |
3ac7fe5a4 infrastructure to... |
479 |
static int limit; |
997772884 debugobjects: Add... |
480 481 482 |
if (limit < 5 && descr != descr_test) { void *hint = descr->debug_hint ? descr->debug_hint(obj->object) : NULL; |
3ac7fe5a4 infrastructure to... |
483 |
limit++; |
a5d8e467f Debugobjects tran... |
484 |
WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
997772884 debugobjects: Add... |
485 486 |
"object type: %s hint: %pS ", |
a5d8e467f Debugobjects tran... |
487 |
msg, obj_states[obj->state], obj->astate, |
997772884 debugobjects: Add... |
488 |
descr->name, hint); |
3ac7fe5a4 infrastructure to... |
489 490 491 492 493 494 495 496 |
} debug_objects_warnings++; } /* * Try to repair the damage, so we have a better chance to get useful * debug output. */ |
b1e4d9d82 debugobjects: mak... |
497 498 |
static bool debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), |
3ac7fe5a4 infrastructure to... |
499 500 |
void * addr, enum debug_obj_state state) { |
b1e4d9d82 debugobjects: mak... |
501 502 503 504 505 |
if (fixup && fixup(addr, state)) { debug_objects_fixups++; return true; } return false; |
3ac7fe5a4 infrastructure to... |
506 507 508 509 |
} static void debug_object_is_on_stack(void *addr, int onstack) { |
3ac7fe5a4 infrastructure to... |
510 511 512 513 514 |
int is_on_stack; static int limit; if (limit > 4) return; |
8b05c7e6e add a helper func... |
515 |
is_on_stack = object_is_on_stack(addr); |
3ac7fe5a4 infrastructure to... |
516 517 518 519 520 |
if (is_on_stack == onstack) return; limit++; if (is_on_stack) |
fc91a3c4c debugobjects: Mak... |
521 522 523 |
pr_warn("object %p is on stack %p, but NOT annotated. ", addr, task_stack_page(current)); |
3ac7fe5a4 infrastructure to... |
524 |
else |
fc91a3c4c debugobjects: Mak... |
525 526 527 |
pr_warn("object %p is NOT on stack %p, but annotated. ", addr, task_stack_page(current)); |
3ac7fe5a4 infrastructure to... |
528 529 530 531 |
WARN_ON(1); } static void |
aedcade6f debugobjects: All... |
532 |
__debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack) |
3ac7fe5a4 infrastructure to... |
533 534 |
{ enum debug_obj_state state; |
d5f34153e debugobjects: Mov... |
535 |
bool check_stack = false; |
3ac7fe5a4 infrastructure to... |
536 537 538 |
struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
50db04dd9 debugobjects: fix... |
539 |
fill_pool(); |
3ac7fe5a4 infrastructure to... |
540 |
db = get_bucket((unsigned long) addr); |
aef9cb052 debugobjects: Con... |
541 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
542 543 544 545 546 547 |
obj = lookup_object(addr, db); if (!obj) { obj = alloc_object(addr, db, descr); if (!obj) { debug_objects_enabled = 0; |
aef9cb052 debugobjects: Con... |
548 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
549 550 551 |
debug_objects_oom(); return; } |
d5f34153e debugobjects: Mov... |
552 |
check_stack = true; |
3ac7fe5a4 infrastructure to... |
553 554 555 556 557 558 559 560 561 562 |
} 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: |
3ac7fe5a4 infrastructure to... |
563 |
state = obj->state; |
aef9cb052 debugobjects: Con... |
564 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
565 |
debug_print_object(obj, "init"); |
3ac7fe5a4 infrastructure to... |
566 567 568 569 |
debug_object_fixup(descr->fixup_init, addr, state); return; case ODEBUG_STATE_DESTROYED: |
d5f34153e debugobjects: Mov... |
570 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
571 |
debug_print_object(obj, "init"); |
d5f34153e debugobjects: Mov... |
572 |
return; |
3ac7fe5a4 infrastructure to... |
573 574 575 |
default: break; } |
aef9cb052 debugobjects: Con... |
576 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
577 578 |
if (check_stack) debug_object_is_on_stack(addr, onstack); |
3ac7fe5a4 infrastructure to... |
579 580 581 582 583 584 585 |
} /** * debug_object_init - debug checks when an object is initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */ |
aedcade6f debugobjects: All... |
586 |
void debug_object_init(void *addr, const struct debug_obj_descr *descr) |
3ac7fe5a4 infrastructure to... |
587 588 589 590 591 592 |
{ if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 0); } |
f8ff04e2b lib/debugobjects:... |
593 |
EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a4 infrastructure to... |
594 595 596 597 598 599 600 |
/** * 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 */ |
aedcade6f debugobjects: All... |
601 |
void debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr) |
3ac7fe5a4 infrastructure to... |
602 603 604 605 606 607 |
{ if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 1); } |
f8ff04e2b lib/debugobjects:... |
608 |
EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a4 infrastructure to... |
609 610 611 612 613 |
/** * debug_object_activate - debug checks when an object is activated * @addr: address of the object * @descr: pointer to an object specific debug description structure |
b778ae253 debugobjects: Mak... |
614 |
* Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a4 infrastructure to... |
615 |
*/ |
aedcade6f debugobjects: All... |
616 |
int debug_object_activate(void *addr, const struct debug_obj_descr *descr) |
3ac7fe5a4 infrastructure to... |
617 618 619 620 621 |
{ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
b778ae253 debugobjects: Mak... |
622 |
int ret; |
feac18dda debugobjects: Be ... |
623 624 625 |
struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; |
3ac7fe5a4 infrastructure to... |
626 627 |
if (!debug_objects_enabled) |
b778ae253 debugobjects: Mak... |
628 |
return 0; |
3ac7fe5a4 infrastructure to... |
629 630 |
db = get_bucket((unsigned long) addr); |
aef9cb052 debugobjects: Con... |
631 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
632 633 634 |
obj = lookup_object(addr, db); if (obj) { |
d5f34153e debugobjects: Mov... |
635 |
bool print_object = false; |
3ac7fe5a4 infrastructure to... |
636 637 638 639 |
switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_ACTIVE; |
b778ae253 debugobjects: Mak... |
640 |
ret = 0; |
3ac7fe5a4 infrastructure to... |
641 642 643 |
break; case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4 infrastructure to... |
644 |
state = obj->state; |
aef9cb052 debugobjects: Con... |
645 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
646 |
debug_print_object(obj, "activate"); |
b778ae253 debugobjects: Mak... |
647 |
ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78bd debugobjects: cor... |
648 |
return ret ? 0 : -EINVAL; |
3ac7fe5a4 infrastructure to... |
649 650 |
case ODEBUG_STATE_DESTROYED: |
d5f34153e debugobjects: Mov... |
651 |
print_object = true; |
b778ae253 debugobjects: Mak... |
652 |
ret = -EINVAL; |
3ac7fe5a4 infrastructure to... |
653 654 |
break; default: |
b778ae253 debugobjects: Mak... |
655 |
ret = 0; |
3ac7fe5a4 infrastructure to... |
656 657 |
break; } |
aef9cb052 debugobjects: Con... |
658 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
659 660 |
if (print_object) debug_print_object(obj, "activate"); |
b778ae253 debugobjects: Mak... |
661 |
return ret; |
3ac7fe5a4 infrastructure to... |
662 |
} |
aef9cb052 debugobjects: Con... |
663 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
664 |
|
3ac7fe5a4 infrastructure to... |
665 |
/* |
b9fdac7f6 debugobjects: ins... |
666 667 668 669 670 |
* 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. |
3ac7fe5a4 infrastructure to... |
671 |
*/ |
b9fdac7f6 debugobjects: ins... |
672 673 674 675 676 |
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 { |
feac18dda debugobjects: Be ... |
677 |
debug_print_object(&o, "activate"); |
b9fdac7f6 debugobjects: ins... |
678 679 680 |
ret = debug_object_fixup(descr->fixup_activate, addr, ODEBUG_STATE_NOTAVAILABLE); return ret ? 0 : -EINVAL; |
b778ae253 debugobjects: Mak... |
681 682 |
} return 0; |
3ac7fe5a4 infrastructure to... |
683 |
} |
f8ff04e2b lib/debugobjects:... |
684 |
EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a4 infrastructure to... |
685 686 687 688 689 690 |
/** * debug_object_deactivate - debug checks when an object is deactivated * @addr: address of the object * @descr: pointer to an object specific debug description structure */ |
aedcade6f debugobjects: All... |
691 |
void debug_object_deactivate(void *addr, const struct debug_obj_descr *descr) |
3ac7fe5a4 infrastructure to... |
692 693 694 695 |
{ struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
d5f34153e debugobjects: Mov... |
696 |
bool print_object = false; |
3ac7fe5a4 infrastructure to... |
697 698 699 700 701 |
if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); |
aef9cb052 debugobjects: Con... |
702 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
703 704 705 706 707 708 709 |
obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: case ODEBUG_STATE_ACTIVE: |
a5d8e467f Debugobjects tran... |
710 711 712 |
if (!obj->astate) obj->state = ODEBUG_STATE_INACTIVE; else |
d5f34153e debugobjects: Mov... |
713 |
print_object = true; |
3ac7fe5a4 infrastructure to... |
714 715 716 |
break; case ODEBUG_STATE_DESTROYED: |
d5f34153e debugobjects: Mov... |
717 |
print_object = true; |
3ac7fe5a4 infrastructure to... |
718 719 720 721 |
break; default: break; } |
d5f34153e debugobjects: Mov... |
722 723 724 725 |
} raw_spin_unlock_irqrestore(&db->lock, flags); if (!obj) { |
3ac7fe5a4 infrastructure to... |
726 727 728 729 730 |
struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "deactivate"); |
d5f34153e debugobjects: Mov... |
731 732 |
} else if (print_object) { debug_print_object(obj, "deactivate"); |
3ac7fe5a4 infrastructure to... |
733 |
} |
3ac7fe5a4 infrastructure to... |
734 |
} |
f8ff04e2b lib/debugobjects:... |
735 |
EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a4 infrastructure to... |
736 737 738 739 740 741 |
/** * debug_object_destroy - debug checks when an object is destroyed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ |
aedcade6f debugobjects: All... |
742 |
void debug_object_destroy(void *addr, const struct debug_obj_descr *descr) |
3ac7fe5a4 infrastructure to... |
743 744 745 746 747 |
{ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
d5f34153e debugobjects: Mov... |
748 |
bool print_object = false; |
3ac7fe5a4 infrastructure to... |
749 750 751 752 753 |
if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); |
aef9cb052 debugobjects: Con... |
754 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
755 756 757 758 759 760 761 762 763 764 765 766 |
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: |
3ac7fe5a4 infrastructure to... |
767 |
state = obj->state; |
aef9cb052 debugobjects: Con... |
768 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
769 |
debug_print_object(obj, "destroy"); |
3ac7fe5a4 infrastructure to... |
770 771 772 773 |
debug_object_fixup(descr->fixup_destroy, addr, state); return; case ODEBUG_STATE_DESTROYED: |
d5f34153e debugobjects: Mov... |
774 |
print_object = true; |
3ac7fe5a4 infrastructure to... |
775 776 777 778 779 |
break; default: break; } out_unlock: |
aef9cb052 debugobjects: Con... |
780 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
781 782 |
if (print_object) debug_print_object(obj, "destroy"); |
3ac7fe5a4 infrastructure to... |
783 |
} |
f8ff04e2b lib/debugobjects:... |
784 |
EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a4 infrastructure to... |
785 786 787 788 789 790 |
/** * debug_object_free - debug checks when an object is freed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ |
aedcade6f debugobjects: All... |
791 |
void debug_object_free(void *addr, const struct debug_obj_descr *descr) |
3ac7fe5a4 infrastructure to... |
792 793 794 795 796 797 798 799 800 801 |
{ 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... |
802 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
803 804 805 806 807 808 809 |
obj = lookup_object(addr, db); if (!obj) goto out_unlock; switch (obj->state) { case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4 infrastructure to... |
810 |
state = obj->state; |
aef9cb052 debugobjects: Con... |
811 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
812 |
debug_print_object(obj, "free"); |
3ac7fe5a4 infrastructure to... |
813 814 815 816 |
debug_object_fixup(descr->fixup_free, addr, state); return; default: hlist_del(&obj->node); |
aef9cb052 debugobjects: Con... |
817 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
818 |
free_object(obj); |
673d62cc5 debugobjects: fix... |
819 |
return; |
3ac7fe5a4 infrastructure to... |
820 821 |
} out_unlock: |
aef9cb052 debugobjects: Con... |
822 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
823 |
} |
f8ff04e2b lib/debugobjects:... |
824 |
EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a4 infrastructure to... |
825 |
|
a5d8e467f Debugobjects tran... |
826 |
/** |
b84d435cc debugobjects: Ext... |
827 828 829 830 |
* 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 */ |
aedcade6f debugobjects: All... |
831 |
void debug_object_assert_init(void *addr, const struct debug_obj_descr *descr) |
b84d435cc debugobjects: Ext... |
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 |
{ 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... |
852 853 854 |
* 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... |
855 |
*/ |
b9fdac7f6 debugobjects: ins... |
856 857 858 859 |
if (descr->is_static_object && descr->is_static_object(addr)) { /* Track this static object */ debug_object_init(addr, descr); } else { |
b84d435cc debugobjects: Ext... |
860 |
debug_print_object(&o, "assert_init"); |
b9fdac7f6 debugobjects: ins... |
861 862 863 |
debug_object_fixup(descr->fixup_assert_init, addr, ODEBUG_STATE_NOTAVAILABLE); } |
b84d435cc debugobjects: Ext... |
864 865 866 867 868 |
return; } raw_spin_unlock_irqrestore(&db->lock, flags); } |
f8ff04e2b lib/debugobjects:... |
869 |
EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435cc debugobjects: Ext... |
870 871 |
/** |
a5d8e467f Debugobjects tran... |
872 873 874 875 876 877 878 |
* 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 |
aedcade6f debugobjects: All... |
879 |
debug_object_active_state(void *addr, const struct debug_obj_descr *descr, |
a5d8e467f Debugobjects tran... |
880 881 882 883 884 |
unsigned int expect, unsigned int next) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
d5f34153e debugobjects: Mov... |
885 |
bool print_object = false; |
a5d8e467f Debugobjects tran... |
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 |
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 |
d5f34153e debugobjects: Mov... |
901 |
print_object = true; |
a5d8e467f Debugobjects tran... |
902 903 904 |
break; default: |
d5f34153e debugobjects: Mov... |
905 |
print_object = true; |
a5d8e467f Debugobjects tran... |
906 907 |
break; } |
d5f34153e debugobjects: Mov... |
908 909 910 911 |
} raw_spin_unlock_irqrestore(&db->lock, flags); if (!obj) { |
a5d8e467f Debugobjects tran... |
912 913 914 915 916 |
struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "active_state"); |
d5f34153e debugobjects: Mov... |
917 918 |
} else if (print_object) { debug_print_object(obj, "active_state"); |
a5d8e467f Debugobjects tran... |
919 |
} |
a5d8e467f Debugobjects tran... |
920 |
} |
f8ff04e2b lib/debugobjects:... |
921 |
EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467f Debugobjects tran... |
922 |
|
3ac7fe5a4 infrastructure to... |
923 924 925 926 |
#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; |
aedcade6f debugobjects: All... |
927 |
const struct debug_obj_descr *descr; |
3ac7fe5a4 infrastructure to... |
928 929 |
enum debug_obj_state state; struct debug_bucket *db; |
1ea9b98b0 debugobjects: Use... |
930 |
struct hlist_node *tmp; |
3ac7fe5a4 infrastructure to... |
931 |
struct debug_obj *obj; |
bd9dcd046 debugobjects: Exp... |
932 |
int cnt, objs_checked = 0; |
3ac7fe5a4 infrastructure to... |
933 934 935 936 937 938 939 940 941 942 943 944 |
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... |
945 |
raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d4 hlist: drop the n... |
946 |
hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a4 infrastructure to... |
947 948 949 950 951 952 953 |
cnt++; oaddr = (unsigned long) obj->object; if (oaddr < saddr || oaddr >= eaddr) continue; switch (obj->state) { case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4 infrastructure to... |
954 955 |
descr = obj->descr; state = obj->state; |
aef9cb052 debugobjects: Con... |
956 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e debugobjects: Mov... |
957 |
debug_print_object(obj, "free"); |
3ac7fe5a4 infrastructure to... |
958 959 960 961 962 |
debug_object_fixup(descr->fixup_free, (void *) oaddr, state); goto repeat; default: hlist_del(&obj->node); |
a7344a68a debugobjects: Les... |
963 |
__free_object(obj); |
3ac7fe5a4 infrastructure to... |
964 965 966 |
break; } } |
aef9cb052 debugobjects: Con... |
967 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc5 debugobjects: fix... |
968 |
|
3ac7fe5a4 infrastructure to... |
969 970 |
if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; |
bd9dcd046 debugobjects: Exp... |
971 972 |
objs_checked += cnt; |
3ac7fe5a4 infrastructure to... |
973 |
} |
bd9dcd046 debugobjects: Exp... |
974 975 976 |
if (objs_checked > debug_objects_maxchecked) debug_objects_maxchecked = objs_checked; |
1ea9b98b0 debugobjects: Use... |
977 978 |
/* Schedule work to actually kmem_cache_free() objects */ |
35fd7a637 debugobjects: Fix... |
979 |
if (!READ_ONCE(obj_freeing) && READ_ONCE(obj_nr_tofree)) { |
a7344a68a debugobjects: Les... |
980 981 982 |
WRITE_ONCE(obj_freeing, true); schedule_delayed_work(&debug_obj_work, ODEBUG_FREE_WORK_DELAY); } |
3ac7fe5a4 infrastructure to... |
983 984 985 986 987 988 989 990 991 992 993 994 995 |
} 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) { |
d86998b17 debugobjects: Add... |
996 997 998 999 |
int cpu, obj_percpu_free = 0; for_each_possible_cpu(cpu) obj_percpu_free += per_cpu(percpu_obj_pool.obj_free, cpu); |
3ac7fe5a4 infrastructure to... |
1000 1001 |
seq_printf(m, "max_chain :%d ", debug_objects_maxchain); |
bd9dcd046 debugobjects: Exp... |
1002 1003 |
seq_printf(m, "max_checked :%d ", debug_objects_maxchecked); |
3ac7fe5a4 infrastructure to... |
1004 1005 1006 1007 |
seq_printf(m, "warnings :%d ", debug_objects_warnings); seq_printf(m, "fixups :%d ", debug_objects_fixups); |
35fd7a637 debugobjects: Fix... |
1008 1009 |
seq_printf(m, "pool_free :%d ", READ_ONCE(obj_pool_free) + obj_percpu_free); |
d86998b17 debugobjects: Add... |
1010 1011 |
seq_printf(m, "pool_pcp_free :%d ", obj_percpu_free); |
3ac7fe5a4 infrastructure to... |
1012 1013 |
seq_printf(m, "pool_min_free :%d ", obj_pool_min_free); |
d86998b17 debugobjects: Add... |
1014 1015 |
seq_printf(m, "pool_used :%d ", obj_pool_used - obj_percpu_free); |
3ac7fe5a4 infrastructure to... |
1016 1017 |
seq_printf(m, "pool_max_used :%d ", obj_pool_max_used); |
35fd7a637 debugobjects: Fix... |
1018 1019 |
seq_printf(m, "on_free_list :%d ", READ_ONCE(obj_nr_tofree)); |
0cad93c34 debugobjects: Imp... |
1020 1021 1022 1023 |
seq_printf(m, "objs_allocated:%d ", debug_objects_allocated); seq_printf(m, "objs_freed :%d ", debug_objects_freed); |
3ac7fe5a4 infrastructure to... |
1024 1025 |
return 0; } |
0f85c4805 debugobjects: Con... |
1026 |
DEFINE_SHOW_ATTRIBUTE(debug_stats); |
3ac7fe5a4 infrastructure to... |
1027 1028 1029 |
static int __init debug_objects_init_debugfs(void) { |
fecb0d95c debugobjects: No ... |
1030 |
struct dentry *dbgdir; |
3ac7fe5a4 infrastructure to... |
1031 1032 1033 1034 1035 |
if (!debug_objects_enabled) return 0; dbgdir = debugfs_create_dir("debug_objects", NULL); |
3ac7fe5a4 infrastructure to... |
1036 |
|
fecb0d95c debugobjects: No ... |
1037 |
debugfs_create_file("stats", 0444, dbgdir, NULL, &debug_stats_fops); |
3ac7fe5a4 infrastructure to... |
1038 1039 |
return 0; |
3ac7fe5a4 infrastructure to... |
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 |
} __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]; }; |
aedcade6f debugobjects: All... |
1055 |
static __initconst const struct debug_obj_descr descr_type_test; |
3ac7fe5a4 infrastructure to... |
1056 |
|
b9fdac7f6 debugobjects: ins... |
1057 1058 1059 1060 1061 1062 |
static bool __init is_static_object(void *addr) { struct self_test *obj = addr; return obj->static_init; } |
3ac7fe5a4 infrastructure to... |
1063 1064 1065 1066 |
/* * fixup_init is called when: * - an active object is initialized */ |
b1e4d9d82 debugobjects: mak... |
1067 |
static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
1068 1069 1070 1071 1072 1073 1074 |
{ 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... |
1075 |
return true; |
3ac7fe5a4 infrastructure to... |
1076 |
default: |
b1e4d9d82 debugobjects: mak... |
1077 |
return false; |
3ac7fe5a4 infrastructure to... |
1078 1079 1080 1081 1082 1083 |
} } /* * fixup_activate is called when: * - an active object is activated |
b9fdac7f6 debugobjects: ins... |
1084 |
* - an unknown non-static object is activated |
3ac7fe5a4 infrastructure to... |
1085 |
*/ |
b1e4d9d82 debugobjects: mak... |
1086 |
static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
1087 1088 1089 1090 1091 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_NOTAVAILABLE: |
b1e4d9d82 debugobjects: mak... |
1092 |
return true; |
3ac7fe5a4 infrastructure to... |
1093 1094 1095 |
case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_activate(obj, &descr_type_test); |
b1e4d9d82 debugobjects: mak... |
1096 |
return true; |
3ac7fe5a4 infrastructure to... |
1097 1098 |
default: |
b1e4d9d82 debugobjects: mak... |
1099 |
return false; |
3ac7fe5a4 infrastructure to... |
1100 1101 1102 1103 1104 1105 1106 |
} } /* * fixup_destroy is called when: * - an active object is destroyed */ |
b1e4d9d82 debugobjects: mak... |
1107 |
static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
1108 1109 1110 1111 1112 1113 1114 |
{ 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... |
1115 |
return true; |
3ac7fe5a4 infrastructure to... |
1116 |
default: |
b1e4d9d82 debugobjects: mak... |
1117 |
return false; |
3ac7fe5a4 infrastructure to... |
1118 1119 1120 1121 1122 1123 1124 |
} } /* * fixup_free is called when: * - an active object is freed */ |
b1e4d9d82 debugobjects: mak... |
1125 |
static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a4 infrastructure to... |
1126 1127 1128 1129 1130 1131 1132 |
{ 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... |
1133 |
return true; |
3ac7fe5a4 infrastructure to... |
1134 |
default: |
b1e4d9d82 debugobjects: mak... |
1135 |
return false; |
3ac7fe5a4 infrastructure to... |
1136 1137 |
} } |
1fb2f77c0 debugobjects: Sec... |
1138 |
static int __init |
3ac7fe5a4 infrastructure to... |
1139 1140 1141 1142 1143 1144 1145 1146 |
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... |
1147 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
1148 1149 1150 |
obj = lookup_object(addr, db); if (!obj && state != ODEBUG_STATE_NONE) { |
5cd2b459d Use WARN() in lib/ |
1151 1152 |
WARN(1, KERN_ERR "ODEBUG: selftest object not found "); |
3ac7fe5a4 infrastructure to... |
1153 1154 1155 |
goto out; } if (obj && obj->state != state) { |
5cd2b459d Use WARN() in lib/ |
1156 1157 |
WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d ", |
3ac7fe5a4 infrastructure to... |
1158 |
obj->state, state); |
3ac7fe5a4 infrastructure to... |
1159 1160 1161 |
goto out; } if (fixups != debug_objects_fixups) { |
5cd2b459d Use WARN() in lib/ |
1162 1163 |
WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d ", |
3ac7fe5a4 infrastructure to... |
1164 |
fixups, debug_objects_fixups); |
3ac7fe5a4 infrastructure to... |
1165 1166 1167 |
goto out; } if (warnings != debug_objects_warnings) { |
5cd2b459d Use WARN() in lib/ |
1168 1169 |
WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d ", |
3ac7fe5a4 infrastructure to... |
1170 |
warnings, debug_objects_warnings); |
3ac7fe5a4 infrastructure to... |
1171 1172 1173 1174 |
goto out; } res = 0; out: |
aef9cb052 debugobjects: Con... |
1175 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4 infrastructure to... |
1176 1177 1178 1179 |
if (res) debug_objects_enabled = 0; return res; } |
aedcade6f debugobjects: All... |
1180 |
static __initconst const struct debug_obj_descr descr_type_test = { |
3ac7fe5a4 infrastructure to... |
1181 |
.name = "selftest", |
b9fdac7f6 debugobjects: ins... |
1182 |
.is_static_object = is_static_object, |
3ac7fe5a4 infrastructure to... |
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 |
.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... |
1232 |
if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a4 infrastructure to... |
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 |
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.... |
1252 1253 |
pr_info("selftest passed "); |
3ac7fe5a4 infrastructure to... |
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 |
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... |
1276 |
raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a4 infrastructure to... |
1277 1278 1279 1280 1281 1282 |
for (i = 0; i < ODEBUG_POOL_SIZE; i++) hlist_add_head(&obj_static_pool[i].node, &obj_pool); } /* |
1be1cb7b4 debugobjects: rep... |
1283 1284 |
* Convert the statically allocated objects to dynamic ones: */ |
1fb2f77c0 debugobjects: Sec... |
1285 |
static int __init debug_objects_replace_static_objects(void) |
1be1cb7b4 debugobjects: rep... |
1286 1287 |
{ struct debug_bucket *db = obj_hash; |
b67bfe0d4 hlist: drop the n... |
1288 |
struct hlist_node *tmp; |
1be1cb7b4 debugobjects: rep... |
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 |
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); } /* |
a9ee3a63d debugobjects: cal... |
1301 1302 1303 |
* debug_objects_mem_init() is now called early that only one CPU is up * and interrupts have been disabled, so it is safe to replace the * active object references. |
1be1cb7b4 debugobjects: rep... |
1304 |
*/ |
1be1cb7b4 debugobjects: rep... |
1305 1306 |
/* Remove the statically allocated objects from the pool */ |
b67bfe0d4 hlist: drop the n... |
1307 |
hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b4 debugobjects: rep... |
1308 1309 1310 1311 1312 1313 1314 |
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... |
1315 |
hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b4 debugobjects: rep... |
1316 1317 1318 1319 1320 1321 1322 1323 |
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++; } } |
c0f35cc0b lib/debugobjects.... |
1324 1325 1326 |
pr_debug("%d of %d active objects replaced ", cnt, obj_pool_used); |
1be1cb7b4 debugobjects: rep... |
1327 1328 |
return 0; free: |
b67bfe0d4 hlist: drop the n... |
1329 |
hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b4 debugobjects: rep... |
1330 1331 1332 1333 1334 1335 1336 |
hlist_del(&obj->node); kmem_cache_free(obj_cache, obj); } return -ENOMEM; } /* |
3ac7fe5a4 infrastructure to... |
1337 1338 1339 1340 1341 1342 1343 |
* 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) { |
634d61f45 debugobjects: Per... |
1344 |
int cpu, extras; |
d86998b17 debugobjects: Add... |
1345 |
|
3ac7fe5a4 infrastructure to... |
1346 1347 |
if (!debug_objects_enabled) return; |
d86998b17 debugobjects: Add... |
1348 1349 1350 1351 1352 1353 1354 1355 |
/* * Initialize the percpu object pools * * Initialization is not strictly necessary, but was done for * completeness. */ for_each_possible_cpu(cpu) INIT_HLIST_HEAD(&per_cpu(percpu_obj_pool.free_objs, cpu)); |
3ac7fe5a4 infrastructure to... |
1356 1357 |
obj_cache = kmem_cache_create("debug_objects_cache", sizeof (struct debug_obj), 0, |
8de456cf8 debugobjects: avo... |
1358 1359 |
SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, NULL); |
3ac7fe5a4 infrastructure to... |
1360 |
|
1be1cb7b4 debugobjects: rep... |
1361 |
if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a4 infrastructure to... |
1362 |
debug_objects_enabled = 0; |
3ff4f80a7 debugobjects: Rem... |
1363 |
kmem_cache_destroy(obj_cache); |
719e48439 lib/debugobjects.... |
1364 1365 |
pr_warn("out of memory. "); |
1be1cb7b4 debugobjects: rep... |
1366 |
} else |
3ac7fe5a4 infrastructure to... |
1367 |
debug_objects_selftest(); |
634d61f45 debugobjects: Per... |
1368 |
|
88451f2cd debugobjects: Fre... |
1369 1370 1371 1372 |
#ifdef CONFIG_HOTPLUG_CPU cpuhp_setup_state_nocalls(CPUHP_DEBUG_OBJ_DEAD, "object:offline", NULL, object_cpu_offline); #endif |
634d61f45 debugobjects: Per... |
1373 1374 1375 1376 1377 1378 1379 |
/* * Increase the thresholds for allocating and freeing objects * according to the number of possible CPUs available in the system. */ extras = num_possible_cpus() * ODEBUG_BATCH_SIZE; debug_objects_pool_size += extras; debug_objects_pool_min_level += extras; |
3ac7fe5a4 infrastructure to... |
1380 |
} |