mirror of https://gitee.com/openkylin/linux.git
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: lockdep: fix debug_lock_alloc lockdep: increase MAX_LOCKDEP_KEYS generic-ipi: fix stack and rcu interaction bug in smp_call_function_mask() lockdep: fix overflow in the hlock shrinkage code lockdep: rename map_[acquire|release]() => lock_map_[acquire|release]() lockdep: handle chains involving classes defined in modules mm: fix mm_take_all_locks() locking order lockdep: annotate mm_take_all_locks() lockdep: spin_lock_nest_lock() lockdep: lock protection locks lockdep: map_acquire lockdep: shrink held_lock structure lockdep: re-annotate scheduler runqueues lockdep: lock_set_subclass - reset a held lock's subclass lockdep: change scheduler annotation debug_locks: set oops_in_progress if we will log messages. lockdep: fix combinatorial explosion in lock subgraph traversal
This commit is contained in:
Linus Torvalds
commit
9b4d0bab32
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@ -291,7 +291,7 @@ handle_t *journal_start(journal_t *journal, int nblocks)
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goto out;
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}
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lock_acquire(&handle->h_lockdep_map, 0, 0, 0, 2, _THIS_IP_);
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lock_map_acquire(&handle->h_lockdep_map);
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out:
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return handle;
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@ -1448,7 +1448,7 @@ int journal_stop(handle_t *handle)
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spin_unlock(&journal->j_state_lock);
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}
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lock_release(&handle->h_lockdep_map, 1, _THIS_IP_);
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lock_map_release(&handle->h_lockdep_map);
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jbd_free_handle(handle);
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return err;
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@ -301,7 +301,7 @@ handle_t *jbd2_journal_start(journal_t *journal, int nblocks)
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goto out;
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}
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lock_acquire(&handle->h_lockdep_map, 0, 0, 0, 2, _THIS_IP_);
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lock_map_acquire(&handle->h_lockdep_map);
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out:
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return handle;
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}
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@ -1279,7 +1279,7 @@ int jbd2_journal_stop(handle_t *handle)
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spin_unlock(&journal->j_state_lock);
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}
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lock_release(&handle->h_lockdep_map, 1, _THIS_IP_);
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lock_map_release(&handle->h_lockdep_map);
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jbd2_free_handle(handle);
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return err;
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@ -89,6 +89,7 @@ struct lock_class {
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struct lockdep_subclass_key *key;
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unsigned int subclass;
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unsigned int dep_gen_id;
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/*
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* IRQ/softirq usage tracking bits:
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@ -189,6 +190,14 @@ struct lock_chain {
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u64 chain_key;
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};
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#define MAX_LOCKDEP_KEYS_BITS 13
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/*
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* Subtract one because we offset hlock->class_idx by 1 in order
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* to make 0 mean no class. This avoids overflowing the class_idx
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* bitfield and hitting the BUG in hlock_class().
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*/
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#define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1)
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struct held_lock {
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/*
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* One-way hash of the dependency chain up to this point. We
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@ -205,14 +214,14 @@ struct held_lock {
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* with zero), here we store the previous hash value:
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*/
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u64 prev_chain_key;
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struct lock_class *class;
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unsigned long acquire_ip;
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struct lockdep_map *instance;
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struct lockdep_map *nest_lock;
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#ifdef CONFIG_LOCK_STAT
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u64 waittime_stamp;
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u64 holdtime_stamp;
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#endif
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unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS;
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/*
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* The lock-stack is unified in that the lock chains of interrupt
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* contexts nest ontop of process context chains, but we 'separate'
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@ -226,11 +235,11 @@ struct held_lock {
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* The following field is used to detect when we cross into an
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* interrupt context:
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*/
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int irq_context;
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int trylock;
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int read;
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int check;
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int hardirqs_off;
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unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
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unsigned int trylock:1;
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unsigned int read:2; /* see lock_acquire() comment */
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unsigned int check:2; /* see lock_acquire() comment */
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unsigned int hardirqs_off:1;
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};
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/*
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@ -294,11 +303,15 @@ extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
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* 2: full validation
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*/
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extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
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int trylock, int read, int check, unsigned long ip);
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int trylock, int read, int check,
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struct lockdep_map *nest_lock, unsigned long ip);
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extern void lock_release(struct lockdep_map *lock, int nested,
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unsigned long ip);
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extern void lock_set_subclass(struct lockdep_map *lock, unsigned int subclass,
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unsigned long ip);
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# define INIT_LOCKDEP .lockdep_recursion = 0,
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#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
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@ -313,8 +326,9 @@ static inline void lockdep_on(void)
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{
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}
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# define lock_acquire(l, s, t, r, c, i) do { } while (0)
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# define lock_acquire(l, s, t, r, c, n, i) do { } while (0)
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# define lock_release(l, n, i) do { } while (0)
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# define lock_set_subclass(l, s, i) do { } while (0)
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# define lockdep_init() do { } while (0)
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# define lockdep_info() do { } while (0)
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# define lockdep_init_map(lock, name, key, sub) do { (void)(key); } while (0)
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|
@ -400,9 +414,11 @@ static inline void print_irqtrace_events(struct task_struct *curr)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# ifdef CONFIG_PROVE_LOCKING
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# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
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# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
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# define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i)
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# else
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# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
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# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
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# define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i)
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# endif
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# define spin_release(l, n, i) lock_release(l, n, i)
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#else
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@ -412,11 +428,11 @@ static inline void print_irqtrace_events(struct task_struct *curr)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# ifdef CONFIG_PROVE_LOCKING
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# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
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# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, i)
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# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
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# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, NULL, i)
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# else
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# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
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# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, i)
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# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
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# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, NULL, i)
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# endif
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# define rwlock_release(l, n, i) lock_release(l, n, i)
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#else
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@ -427,9 +443,9 @@ static inline void print_irqtrace_events(struct task_struct *curr)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# ifdef CONFIG_PROVE_LOCKING
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# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
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# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
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# else
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# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
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# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
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# endif
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# define mutex_release(l, n, i) lock_release(l, n, i)
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#else
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|
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@ -439,11 +455,11 @@ static inline void print_irqtrace_events(struct task_struct *curr)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# ifdef CONFIG_PROVE_LOCKING
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# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
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# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, i)
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# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
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# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, NULL, i)
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# else
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# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
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# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, i)
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# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
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# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, NULL, i)
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# endif
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# define rwsem_release(l, n, i) lock_release(l, n, i)
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#else
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|
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@ -452,4 +468,16 @@ static inline void print_irqtrace_events(struct task_struct *curr)
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# define rwsem_release(l, n, i) do { } while (0)
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#endif
|
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|
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# ifdef CONFIG_PROVE_LOCKING
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# define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_)
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# else
|
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# define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_)
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# endif
|
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# define lock_map_release(l) lock_release(l, 1, _THIS_IP_)
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#else
|
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# define lock_map_acquire(l) do { } while (0)
|
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# define lock_map_release(l) do { } while (0)
|
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#endif
|
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|
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#endif /* __LINUX_LOCKDEP_H */
|
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|
|
|
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|
|
@ -117,7 +117,7 @@ extern int rcu_needs_cpu(int cpu);
|
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
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extern struct lockdep_map rcu_lock_map;
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# define rcu_read_acquire() \
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lock_acquire(&rcu_lock_map, 0, 0, 2, 1, _THIS_IP_)
|
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lock_acquire(&rcu_lock_map, 0, 0, 2, 1, NULL, _THIS_IP_)
|
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# define rcu_read_release() lock_release(&rcu_lock_map, 1, _THIS_IP_)
|
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#else
|
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# define rcu_read_acquire() do { } while (0)
|
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|
|
|
|||
|
|
@ -183,8 +183,14 @@ do { \
|
|||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
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# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
|
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# define spin_lock_nest_lock(lock, nest_lock) \
|
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do { \
|
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typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
|
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_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \
|
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} while (0)
|
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#else
|
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# define spin_lock_nested(lock, subclass) _spin_lock(lock)
|
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# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
|
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#endif
|
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|
||||
#define write_lock(lock) _write_lock(lock)
|
||||
|
|
|
|||
|
|
@ -22,6 +22,8 @@ int in_lock_functions(unsigned long addr);
|
|||
void __lockfunc _spin_lock(spinlock_t *lock) __acquires(lock);
|
||||
void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
|
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__acquires(lock);
|
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void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *map)
|
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__acquires(lock);
|
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void __lockfunc _read_lock(rwlock_t *lock) __acquires(lock);
|
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void __lockfunc _write_lock(rwlock_t *lock) __acquires(lock);
|
||||
void __lockfunc _spin_lock_bh(spinlock_t *lock) __acquires(lock);
|
||||
|
|
|
|||
295
kernel/lockdep.c
295
kernel/lockdep.c
|
|
@ -124,6 +124,15 @@ static struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
|
|||
unsigned long nr_lock_classes;
|
||||
static struct lock_class lock_classes[MAX_LOCKDEP_KEYS];
|
||||
|
||||
static inline struct lock_class *hlock_class(struct held_lock *hlock)
|
||||
{
|
||||
if (!hlock->class_idx) {
|
||||
DEBUG_LOCKS_WARN_ON(1);
|
||||
return NULL;
|
||||
}
|
||||
return lock_classes + hlock->class_idx - 1;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_LOCK_STAT
|
||||
static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], lock_stats);
|
||||
|
||||
|
|
@ -222,7 +231,7 @@ static void lock_release_holdtime(struct held_lock *hlock)
|
|||
|
||||
holdtime = sched_clock() - hlock->holdtime_stamp;
|
||||
|
||||
stats = get_lock_stats(hlock->class);
|
||||
stats = get_lock_stats(hlock_class(hlock));
|
||||
if (hlock->read)
|
||||
lock_time_inc(&stats->read_holdtime, holdtime);
|
||||
else
|
||||
|
|
@ -372,6 +381,19 @@ unsigned int nr_process_chains;
|
|||
unsigned int max_lockdep_depth;
|
||||
unsigned int max_recursion_depth;
|
||||
|
||||
static unsigned int lockdep_dependency_gen_id;
|
||||
|
||||
static bool lockdep_dependency_visit(struct lock_class *source,
|
||||
unsigned int depth)
|
||||
{
|
||||
if (!depth)
|
||||
lockdep_dependency_gen_id++;
|
||||
if (source->dep_gen_id == lockdep_dependency_gen_id)
|
||||
return true;
|
||||
source->dep_gen_id = lockdep_dependency_gen_id;
|
||||
return false;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCKDEP
|
||||
/*
|
||||
* We cannot printk in early bootup code. Not even early_printk()
|
||||
|
|
@ -505,7 +527,7 @@ static void print_lockdep_cache(struct lockdep_map *lock)
|
|||
|
||||
static void print_lock(struct held_lock *hlock)
|
||||
{
|
||||
print_lock_name(hlock->class);
|
||||
print_lock_name(hlock_class(hlock));
|
||||
printk(", at: ");
|
||||
print_ip_sym(hlock->acquire_ip);
|
||||
}
|
||||
|
|
@ -558,6 +580,9 @@ static void print_lock_dependencies(struct lock_class *class, int depth)
|
|||
{
|
||||
struct lock_list *entry;
|
||||
|
||||
if (lockdep_dependency_visit(class, depth))
|
||||
return;
|
||||
|
||||
if (DEBUG_LOCKS_WARN_ON(depth >= 20))
|
||||
return;
|
||||
|
||||
|
|
@ -932,7 +957,7 @@ static noinline int print_circular_bug_tail(void)
|
|||
if (debug_locks_silent)
|
||||
return 0;
|
||||
|
||||
this.class = check_source->class;
|
||||
this.class = hlock_class(check_source);
|
||||
if (!save_trace(&this.trace))
|
||||
return 0;
|
||||
|
||||
|
|
@ -959,6 +984,67 @@ static int noinline print_infinite_recursion_bug(void)
|
|||
return 0;
|
||||
}
|
||||
|
||||
unsigned long __lockdep_count_forward_deps(struct lock_class *class,
|
||||
unsigned int depth)
|
||||
{
|
||||
struct lock_list *entry;
|
||||
unsigned long ret = 1;
|
||||
|
||||
if (lockdep_dependency_visit(class, depth))
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* Recurse this class's dependency list:
|
||||
*/
|
||||
list_for_each_entry(entry, &class->locks_after, entry)
|
||||
ret += __lockdep_count_forward_deps(entry->class, depth + 1);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
unsigned long lockdep_count_forward_deps(struct lock_class *class)
|
||||
{
|
||||
unsigned long ret, flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
__raw_spin_lock(&lockdep_lock);
|
||||
ret = __lockdep_count_forward_deps(class, 0);
|
||||
__raw_spin_unlock(&lockdep_lock);
|
||||
local_irq_restore(flags);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
unsigned long __lockdep_count_backward_deps(struct lock_class *class,
|
||||
unsigned int depth)
|
||||
{
|
||||
struct lock_list *entry;
|
||||
unsigned long ret = 1;
|
||||
|
||||
if (lockdep_dependency_visit(class, depth))
|
||||
return 0;
|
||||
/*
|
||||
* Recurse this class's dependency list:
|
||||
*/
|
||||
list_for_each_entry(entry, &class->locks_before, entry)
|
||||
ret += __lockdep_count_backward_deps(entry->class, depth + 1);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
unsigned long lockdep_count_backward_deps(struct lock_class *class)
|
||||
{
|
||||
unsigned long ret, flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
__raw_spin_lock(&lockdep_lock);
|
||||
ret = __lockdep_count_backward_deps(class, 0);
|
||||
__raw_spin_unlock(&lockdep_lock);
|
||||
local_irq_restore(flags);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Prove that the dependency graph starting at <entry> can not
|
||||
* lead to <target>. Print an error and return 0 if it does.
|
||||
|
|
@ -968,6 +1054,9 @@ check_noncircular(struct lock_class *source, unsigned int depth)
|
|||
{
|
||||
struct lock_list *entry;
|
||||
|
||||
if (lockdep_dependency_visit(source, depth))
|
||||
return 1;
|
||||
|
||||
debug_atomic_inc(&nr_cyclic_check_recursions);
|
||||
if (depth > max_recursion_depth)
|
||||
max_recursion_depth = depth;
|
||||
|
|
@ -977,7 +1066,7 @@ check_noncircular(struct lock_class *source, unsigned int depth)
|
|||
* Check this lock's dependency list:
|
||||
*/
|
||||
list_for_each_entry(entry, &source->locks_after, entry) {
|
||||
if (entry->class == check_target->class)
|
||||
if (entry->class == hlock_class(check_target))
|
||||
return print_circular_bug_header(entry, depth+1);
|
||||
debug_atomic_inc(&nr_cyclic_checks);
|
||||
if (!check_noncircular(entry->class, depth+1))
|
||||
|
|
@ -1011,6 +1100,9 @@ find_usage_forwards(struct lock_class *source, unsigned int depth)
|
|||
struct lock_list *entry;
|
||||
int ret;
|
||||
|
||||
if (lockdep_dependency_visit(source, depth))
|
||||
return 1;
|
||||
|
||||
if (depth > max_recursion_depth)
|
||||
max_recursion_depth = depth;
|
||||
if (depth >= RECURSION_LIMIT)
|
||||
|
|
@ -1050,6 +1142,9 @@ find_usage_backwards(struct lock_class *source, unsigned int depth)
|
|||
struct lock_list *entry;
|
||||
int ret;
|
||||
|
||||
if (lockdep_dependency_visit(source, depth))
|
||||
return 1;
|
||||
|
||||
if (!__raw_spin_is_locked(&lockdep_lock))
|
||||
return DEBUG_LOCKS_WARN_ON(1);
|
||||
|
||||
|
|
@ -1064,6 +1159,11 @@ find_usage_backwards(struct lock_class *source, unsigned int depth)
|
|||
return 2;
|
||||
}
|
||||
|
||||
if (!source && debug_locks_off_graph_unlock()) {
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check this lock's dependency list:
|
||||
*/
|
||||
|
|
@ -1103,9 +1203,9 @@ print_bad_irq_dependency(struct task_struct *curr,
|
|||
printk("\nand this task is already holding:\n");
|
||||
print_lock(prev);
|
||||
printk("which would create a new lock dependency:\n");
|
||||
print_lock_name(prev->class);
|
||||
print_lock_name(hlock_class(prev));
|
||||
printk(" ->");
|
||||
print_lock_name(next->class);
|
||||
print_lock_name(hlock_class(next));
|
||||
printk("\n");
|
||||
|
||||
printk("\nbut this new dependency connects a %s-irq-safe lock:\n",
|
||||
|
|
@ -1146,12 +1246,12 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
|
|||
|
||||
find_usage_bit = bit_backwards;
|
||||
/* fills in <backwards_match> */
|
||||
ret = find_usage_backwards(prev->class, 0);
|
||||
ret = find_usage_backwards(hlock_class(prev), 0);
|
||||
if (!ret || ret == 1)
|
||||
return ret;
|
||||
|
||||
find_usage_bit = bit_forwards;
|
||||
ret = find_usage_forwards(next->class, 0);
|
||||
ret = find_usage_forwards(hlock_class(next), 0);
|
||||
if (!ret || ret == 1)
|
||||
return ret;
|
||||
/* ret == 2 */
|
||||
|
|
@ -1272,18 +1372,32 @@ check_deadlock(struct task_struct *curr, struct held_lock *next,
|
|||
struct lockdep_map *next_instance, int read)
|
||||
{
|
||||
struct held_lock *prev;
|
||||
struct held_lock *nest = NULL;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < curr->lockdep_depth; i++) {
|
||||
prev = curr->held_locks + i;
|
||||
if (prev->class != next->class)
|
||||
|
||||
if (prev->instance == next->nest_lock)
|
||||
nest = prev;
|
||||
|
||||
if (hlock_class(prev) != hlock_class(next))
|
||||
continue;
|
||||
|
||||
/*
|
||||
* Allow read-after-read recursion of the same
|
||||
* lock class (i.e. read_lock(lock)+read_lock(lock)):
|
||||
*/
|
||||
if ((read == 2) && prev->read)
|
||||
return 2;
|
||||
|
||||
/*
|
||||
* We're holding the nest_lock, which serializes this lock's
|
||||
* nesting behaviour.
|
||||
*/
|
||||
if (nest)
|
||||
return 2;
|
||||
|
||||
return print_deadlock_bug(curr, prev, next);
|
||||
}
|
||||
return 1;
|
||||
|
|
@ -1329,7 +1443,7 @@ check_prev_add(struct task_struct *curr, struct held_lock *prev,
|
|||
*/
|
||||
check_source = next;
|
||||
check_target = prev;
|
||||
if (!(check_noncircular(next->class, 0)))
|
||||
if (!(check_noncircular(hlock_class(next), 0)))
|
||||
return print_circular_bug_tail();
|
||||
|
||||
if (!check_prev_add_irq(curr, prev, next))
|
||||
|
|
@ -1353,8 +1467,8 @@ check_prev_add(struct task_struct *curr, struct held_lock *prev,
|
|||
* chains - the second one will be new, but L1 already has
|
||||
* L2 added to its dependency list, due to the first chain.)
|
||||
*/
|
||||
list_for_each_entry(entry, &prev->class->locks_after, entry) {
|
||||
if (entry->class == next->class) {
|
||||
list_for_each_entry(entry, &hlock_class(prev)->locks_after, entry) {
|
||||
if (entry->class == hlock_class(next)) {
|
||||
if (distance == 1)
|
||||
entry->distance = 1;
|
||||
return 2;
|
||||
|
|
@ -1365,26 +1479,28 @@ check_prev_add(struct task_struct *curr, struct held_lock *prev,
|
|||
* Ok, all validations passed, add the new lock
|
||||
* to the previous lock's dependency list:
|
||||
*/
|
||||
ret = add_lock_to_list(prev->class, next->class,
|
||||
&prev->class->locks_after, next->acquire_ip, distance);
|
||||
ret = add_lock_to_list(hlock_class(prev), hlock_class(next),
|
||||
&hlock_class(prev)->locks_after,
|
||||
next->acquire_ip, distance);
|
||||
|
||||
if (!ret)
|
||||
return 0;
|
||||
|
||||
ret = add_lock_to_list(next->class, prev->class,
|
||||
&next->class->locks_before, next->acquire_ip, distance);
|
||||
ret = add_lock_to_list(hlock_class(next), hlock_class(prev),
|
||||
&hlock_class(next)->locks_before,
|
||||
next->acquire_ip, distance);
|
||||
if (!ret)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* Debugging printouts:
|
||||
*/
|
||||
if (verbose(prev->class) || verbose(next->class)) {
|
||||
if (verbose(hlock_class(prev)) || verbose(hlock_class(next))) {
|
||||
graph_unlock();
|
||||
printk("\n new dependency: ");
|
||||
print_lock_name(prev->class);
|
||||
print_lock_name(hlock_class(prev));
|
||||
printk(" => ");
|
||||
print_lock_name(next->class);
|
||||
print_lock_name(hlock_class(next));
|
||||
printk("\n");
|
||||
dump_stack();
|
||||
return graph_lock();
|
||||
|
|
@ -1481,7 +1597,7 @@ static inline int lookup_chain_cache(struct task_struct *curr,
|
|||
struct held_lock *hlock,
|
||||
u64 chain_key)
|
||||
{
|
||||
struct lock_class *class = hlock->class;
|
||||
struct lock_class *class = hlock_class(hlock);
|
||||
struct list_head *hash_head = chainhashentry(chain_key);
|
||||
struct lock_chain *chain;
|
||||
struct held_lock *hlock_curr, *hlock_next;
|
||||
|
|
@ -1554,7 +1670,7 @@ static inline int lookup_chain_cache(struct task_struct *curr,
|
|||
if (likely(cn + chain->depth <= MAX_LOCKDEP_CHAIN_HLOCKS)) {
|
||||
chain->base = cn;
|
||||
for (j = 0; j < chain->depth - 1; j++, i++) {
|
||||
int lock_id = curr->held_locks[i].class - lock_classes;
|
||||
int lock_id = curr->held_locks[i].class_idx - 1;
|
||||
chain_hlocks[chain->base + j] = lock_id;
|
||||
}
|
||||
chain_hlocks[chain->base + j] = class - lock_classes;
|
||||
|
|
@ -1650,7 +1766,7 @@ static void check_chain_key(struct task_struct *curr)
|
|||
WARN_ON(1);
|
||||
return;
|
||||
}
|
||||
id = hlock->class - lock_classes;
|
||||
id = hlock->class_idx - 1;
|
||||
if (DEBUG_LOCKS_WARN_ON(id >= MAX_LOCKDEP_KEYS))
|
||||
return;
|
||||
|
||||
|
|
@ -1695,7 +1811,7 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
|
|||
print_lock(this);
|
||||
|
||||
printk("{%s} state was registered at:\n", usage_str[prev_bit]);
|
||||
print_stack_trace(this->class->usage_traces + prev_bit, 1);
|
||||
print_stack_trace(hlock_class(this)->usage_traces + prev_bit, 1);
|
||||
|
||||
print_irqtrace_events(curr);
|
||||
printk("\nother info that might help us debug this:\n");
|
||||
|
|
@ -1714,7 +1830,7 @@ static inline int
|
|||
valid_state(struct task_struct *curr, struct held_lock *this,
|
||||
enum lock_usage_bit new_bit, enum lock_usage_bit bad_bit)
|
||||
{
|
||||
if (unlikely(this->class->usage_mask & (1 << bad_bit)))
|
||||
if (unlikely(hlock_class(this)->usage_mask & (1 << bad_bit)))
|
||||
return print_usage_bug(curr, this, bad_bit, new_bit);
|
||||
return 1;
|
||||
}
|
||||
|
|
@ -1753,7 +1869,7 @@ print_irq_inversion_bug(struct task_struct *curr, struct lock_class *other,
|
|||
lockdep_print_held_locks(curr);
|
||||
|
||||
printk("\nthe first lock's dependencies:\n");
|
||||
print_lock_dependencies(this->class, 0);
|
||||
print_lock_dependencies(hlock_class(this), 0);
|
||||
|
||||
printk("\nthe second lock's dependencies:\n");
|
||||
print_lock_dependencies(other, 0);
|
||||
|
|
@ -1776,7 +1892,7 @@ check_usage_forwards(struct task_struct *curr, struct held_lock *this,
|
|||
|
||||
find_usage_bit = bit;
|
||||
/* fills in <forwards_match> */
|
||||
ret = find_usage_forwards(this->class, 0);
|
||||
ret = find_usage_forwards(hlock_class(this), 0);
|
||||
if (!ret || ret == 1)
|
||||
return ret;
|
||||
|
||||
|
|
@ -1795,7 +1911,7 @@ check_usage_backwards(struct task_struct *curr, struct held_lock *this,
|
|||
|
||||
find_usage_bit = bit;
|
||||
/* fills in <backwards_match> */
|
||||
ret = find_usage_backwards(this->class, 0);
|
||||
ret = find_usage_backwards(hlock_class(this), 0);
|
||||
if (!ret || ret == 1)
|
||||
return ret;
|
||||
|
||||
|
|
@ -1861,7 +1977,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
LOCK_ENABLED_HARDIRQS_READ, "hard-read"))
|
||||
return 0;
|
||||
#endif
|
||||
if (hardirq_verbose(this->class))
|
||||
if (hardirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_USED_IN_SOFTIRQ:
|
||||
|
|
@ -1886,7 +2002,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
LOCK_ENABLED_SOFTIRQS_READ, "soft-read"))
|
||||
return 0;
|
||||
#endif
|
||||
if (softirq_verbose(this->class))
|
||||
if (softirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_USED_IN_HARDIRQ_READ:
|
||||
|
|
@ -1899,7 +2015,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
if (!check_usage_forwards(curr, this,
|
||||
LOCK_ENABLED_HARDIRQS, "hard"))
|
||||
return 0;
|
||||
if (hardirq_verbose(this->class))
|
||||
if (hardirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_USED_IN_SOFTIRQ_READ:
|
||||
|
|
@ -1912,7 +2028,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
if (!check_usage_forwards(curr, this,
|
||||
LOCK_ENABLED_SOFTIRQS, "soft"))
|
||||
return 0;
|
||||
if (softirq_verbose(this->class))
|
||||
if (softirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_ENABLED_HARDIRQS:
|
||||
|
|
@ -1938,7 +2054,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
LOCK_USED_IN_HARDIRQ_READ, "hard-read"))
|
||||
return 0;
|
||||
#endif
|
||||
if (hardirq_verbose(this->class))
|
||||
if (hardirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_ENABLED_SOFTIRQS:
|
||||
|
|
@ -1964,7 +2080,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
LOCK_USED_IN_SOFTIRQ_READ, "soft-read"))
|
||||
return 0;
|
||||
#endif
|
||||
if (softirq_verbose(this->class))
|
||||
if (softirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_ENABLED_HARDIRQS_READ:
|
||||
|
|
@ -1979,7 +2095,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
LOCK_USED_IN_HARDIRQ, "hard"))
|
||||
return 0;
|
||||
#endif
|
||||
if (hardirq_verbose(this->class))
|
||||
if (hardirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
case LOCK_ENABLED_SOFTIRQS_READ:
|
||||
|
|
@ -1994,7 +2110,7 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
|
|||
LOCK_USED_IN_SOFTIRQ, "soft"))
|
||||
return 0;
|
||||
#endif
|
||||
if (softirq_verbose(this->class))
|
||||
if (softirq_verbose(hlock_class(this)))
|
||||
ret = 2;
|
||||
break;
|
||||
default:
|
||||
|
|
@ -2310,7 +2426,7 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
|
|||
* If already set then do not dirty the cacheline,
|
||||
* nor do any checks:
|
||||
*/
|
||||
if (likely(this->class->usage_mask & new_mask))
|
||||
if (likely(hlock_class(this)->usage_mask & new_mask))
|
||||
return 1;
|
||||
|
||||
if (!graph_lock())
|
||||
|
|
@ -2318,14 +2434,14 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
|
|||
/*
|
||||
* Make sure we didnt race:
|
||||
*/
|
||||
if (unlikely(this->class->usage_mask & new_mask)) {
|
||||
if (unlikely(hlock_class(this)->usage_mask & new_mask)) {
|
||||
graph_unlock();
|
||||
return 1;
|
||||
}
|
||||
|
||||
this->class->usage_mask |= new_mask;
|
||||
hlock_class(this)->usage_mask |= new_mask;
|
||||
|
||||
if (!save_trace(this->class->usage_traces + new_bit))
|
||||
if (!save_trace(hlock_class(this)->usage_traces + new_bit))
|
||||
return 0;
|
||||
|
||||
switch (new_bit) {
|
||||
|
|
@ -2405,7 +2521,7 @@ EXPORT_SYMBOL_GPL(lockdep_init_map);
|
|||
*/
|
||||
static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
|
||||
int trylock, int read, int check, int hardirqs_off,
|
||||
unsigned long ip)
|
||||
struct lockdep_map *nest_lock, unsigned long ip)
|
||||
{
|
||||
struct task_struct *curr = current;
|
||||
struct lock_class *class = NULL;
|
||||
|
|
@ -2459,10 +2575,12 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
|
|||
return 0;
|
||||
|
||||
hlock = curr->held_locks + depth;
|
||||
|
||||
hlock->class = class;
|
||||
if (DEBUG_LOCKS_WARN_ON(!class))
|
||||
return 0;
|
||||
hlock->class_idx = class - lock_classes + 1;
|
||||
hlock->acquire_ip = ip;
|
||||
hlock->instance = lock;
|
||||
hlock->nest_lock = nest_lock;
|
||||
hlock->trylock = trylock;
|
||||
hlock->read = read;
|
||||
hlock->check = check;
|
||||
|
|
@ -2574,6 +2692,55 @@ static int check_unlock(struct task_struct *curr, struct lockdep_map *lock,
|
|||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
__lock_set_subclass(struct lockdep_map *lock,
|
||||
unsigned int subclass, unsigned long ip)
|
||||
{
|
||||
struct task_struct *curr = current;
|
||||
struct held_lock *hlock, *prev_hlock;
|
||||
struct lock_class *class;
|
||||
unsigned int depth;
|
||||
int i;
|
||||
|
||||
depth = curr->lockdep_depth;
|
||||
if (DEBUG_LOCKS_WARN_ON(!depth))
|
||||
return 0;
|
||||
|
||||
prev_hlock = NULL;
|
||||
for (i = depth-1; i >= 0; i--) {
|
||||
hlock = curr->held_locks + i;
|
||||
/*
|
||||
* We must not cross into another context:
|
||||
*/
|
||||
if (prev_hlock && prev_hlock->irq_context != hlock->irq_context)
|
||||
break;
|
||||
if (hlock->instance == lock)
|
||||
goto found_it;
|
||||
prev_hlock = hlock;
|
||||
}
|
||||
return print_unlock_inbalance_bug(curr, lock, ip);
|
||||
|
||||
found_it:
|
||||
class = register_lock_class(lock, subclass, 0);
|
||||
hlock->class_idx = class - lock_classes + 1;
|
||||
|
||||
curr->lockdep_depth = i;
|
||||
curr->curr_chain_key = hlock->prev_chain_key;
|
||||
|
||||
for (; i < depth; i++) {
|
||||
hlock = curr->held_locks + i;
|
||||
if (!__lock_acquire(hlock->instance,
|
||||
hlock_class(hlock)->subclass, hlock->trylock,
|
||||
hlock->read, hlock->check, hlock->hardirqs_off,
|
||||
hlock->nest_lock, hlock->acquire_ip))
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth))
|
||||
return 0;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Remove the lock to the list of currently held locks in a
|
||||
* potentially non-nested (out of order) manner. This is a
|
||||
|
|
@ -2624,9 +2791,9 @@ lock_release_non_nested(struct task_struct *curr,
|
|||
for (i++; i < depth; i++) {
|
||||
hlock = curr->held_locks + i;
|
||||
if (!__lock_acquire(hlock->instance,
|
||||
hlock->class->subclass, hlock->trylock,
|
||||
hlock_class(hlock)->subclass, hlock->trylock,
|
||||
hlock->read, hlock->check, hlock->hardirqs_off,
|
||||
hlock->acquire_ip))
|
||||
hlock->nest_lock, hlock->acquire_ip))
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2669,7 +2836,7 @@ static int lock_release_nested(struct task_struct *curr,
|
|||
|
||||
#ifdef CONFIG_DEBUG_LOCKDEP
|
||||
hlock->prev_chain_key = 0;
|
||||
hlock->class = NULL;
|
||||
hlock->class_idx = 0;
|
||||
hlock->acquire_ip = 0;
|
||||
hlock->irq_context = 0;
|
||||
#endif
|
||||
|
|
@ -2738,18 +2905,36 @@ static void check_flags(unsigned long flags)
|
|||
#endif
|
||||
}
|
||||
|
||||
void
|
||||
lock_set_subclass(struct lockdep_map *lock,
|
||||
unsigned int subclass, unsigned long ip)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
if (unlikely(current->lockdep_recursion))
|
||||
return;
|
||||
|
||||
raw_local_irq_save(flags);
|
||||
current->lockdep_recursion = 1;
|
||||
check_flags(flags);
|
||||
if (__lock_set_subclass(lock, subclass, ip))
|
||||
check_chain_key(current);
|
||||
current->lockdep_recursion = 0;
|
||||
raw_local_irq_restore(flags);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(lock_set_subclass);
|
||||
|
||||
/*
|
||||
* We are not always called with irqs disabled - do that here,
|
||||
* and also avoid lockdep recursion:
|
||||
*/
|
||||
void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
|
||||
int trylock, int read, int check, unsigned long ip)
|
||||
int trylock, int read, int check,
|
||||
struct lockdep_map *nest_lock, unsigned long ip)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
if (unlikely(!lock_stat && !prove_locking))
|
||||
return;
|
||||
|
||||
if (unlikely(current->lockdep_recursion))
|
||||
return;
|
||||
|
||||
|
|
@ -2758,7 +2943,7 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
|
|||
|
||||
current->lockdep_recursion = 1;
|
||||
__lock_acquire(lock, subclass, trylock, read, check,
|
||||
irqs_disabled_flags(flags), ip);
|
||||
irqs_disabled_flags(flags), nest_lock, ip);
|
||||
current->lockdep_recursion = 0;
|
||||
raw_local_irq_restore(flags);
|
||||
}
|
||||
|
|
@ -2770,9 +2955,6 @@ void lock_release(struct lockdep_map *lock, int nested,
|
|||
{
|
||||
unsigned long flags;
|
||||
|
||||
if (unlikely(!lock_stat && !prove_locking))
|
||||
return;
|
||||
|
||||
if (unlikely(current->lockdep_recursion))
|
||||
return;
|
||||
|
||||
|
|
@ -2845,9 +3027,9 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip)
|
|||
found_it:
|
||||
hlock->waittime_stamp = sched_clock();
|
||||
|
||||
point = lock_contention_point(hlock->class, ip);
|
||||
point = lock_contention_point(hlock_class(hlock), ip);
|
||||
|
||||
stats = get_lock_stats(hlock->class);
|
||||
stats = get_lock_stats(hlock_class(hlock));
|
||||
if (point < ARRAY_SIZE(stats->contention_point))
|
||||
stats->contention_point[i]++;
|
||||
if (lock->cpu != smp_processor_id())
|
||||
|
|
@ -2893,7 +3075,7 @@ __lock_acquired(struct lockdep_map *lock)
|
|||
hlock->holdtime_stamp = now;
|
||||
}
|
||||
|
||||
stats = get_lock_stats(hlock->class);
|
||||
stats = get_lock_stats(hlock_class(hlock));
|
||||
if (waittime) {
|
||||
if (hlock->read)
|
||||
lock_time_inc(&stats->read_waittime, waittime);
|
||||
|
|
@ -2988,6 +3170,7 @@ static void zap_class(struct lock_class *class)
|
|||
list_del_rcu(&class->hash_entry);
|
||||
list_del_rcu(&class->lock_entry);
|
||||
|
||||
class->key = NULL;
|
||||
}
|
||||
|
||||
static inline int within(const void *addr, void *start, unsigned long size)
|
||||
|
|
|
|||
|
|
@ -17,9 +17,6 @@
|
|||
*/
|
||||
#define MAX_LOCKDEP_ENTRIES 8192UL
|
||||
|
||||
#define MAX_LOCKDEP_KEYS_BITS 11
|
||||
#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
|
||||
|
||||
#define MAX_LOCKDEP_CHAINS_BITS 14
|
||||
#define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
|
||||
|
||||
|
|
@ -53,6 +50,9 @@ extern unsigned int nr_process_chains;
|
|||
extern unsigned int max_lockdep_depth;
|
||||
extern unsigned int max_recursion_depth;
|
||||
|
||||
extern unsigned long lockdep_count_forward_deps(struct lock_class *);
|
||||
extern unsigned long lockdep_count_backward_deps(struct lock_class *);
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCKDEP
|
||||
/*
|
||||
* Various lockdep statistics:
|
||||
|
|
|
|||
|
|
@ -63,34 +63,6 @@ static void l_stop(struct seq_file *m, void *v)
|
|||
{
|
||||
}
|
||||
|
||||
static unsigned long count_forward_deps(struct lock_class *class)
|
||||
{
|
||||
struct lock_list *entry;
|
||||
unsigned long ret = 1;
|
||||
|
||||
/*
|
||||
* Recurse this class's dependency list:
|
||||
*/
|
||||
list_for_each_entry(entry, &class->locks_after, entry)
|
||||
ret += count_forward_deps(entry->class);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static unsigned long count_backward_deps(struct lock_class *class)
|
||||
{
|
||||
struct lock_list *entry;
|
||||
unsigned long ret = 1;
|
||||
|
||||
/*
|
||||
* Recurse this class's dependency list:
|
||||
*/
|
||||
list_for_each_entry(entry, &class->locks_before, entry)
|
||||
ret += count_backward_deps(entry->class);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void print_name(struct seq_file *m, struct lock_class *class)
|
||||
{
|
||||
char str[128];
|
||||
|
|
@ -124,10 +96,10 @@ static int l_show(struct seq_file *m, void *v)
|
|||
#ifdef CONFIG_DEBUG_LOCKDEP
|
||||
seq_printf(m, " OPS:%8ld", class->ops);
|
||||
#endif
|
||||
nr_forward_deps = count_forward_deps(class);
|
||||
nr_forward_deps = lockdep_count_forward_deps(class);
|
||||
seq_printf(m, " FD:%5ld", nr_forward_deps);
|
||||
|
||||
nr_backward_deps = count_backward_deps(class);
|
||||
nr_backward_deps = lockdep_count_backward_deps(class);
|
||||
seq_printf(m, " BD:%5ld", nr_backward_deps);
|
||||
|
||||
get_usage_chars(class, &c1, &c2, &c3, &c4);
|
||||
|
|
@ -229,6 +201,9 @@ static int lc_show(struct seq_file *m, void *v)
|
|||
|
||||
for (i = 0; i < chain->depth; i++) {
|
||||
class = lock_chain_get_class(chain, i);
|
||||
if (!class->key)
|
||||
continue;
|
||||
|
||||
seq_printf(m, "[%p] ", class->key);
|
||||
print_name(m, class);
|
||||
seq_puts(m, "\n");
|
||||
|
|
@ -350,7 +325,7 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
|
|||
if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ)
|
||||
nr_hardirq_read_unsafe++;
|
||||
|
||||
sum_forward_deps += count_forward_deps(class);
|
||||
sum_forward_deps += lockdep_count_forward_deps(class);
|
||||
}
|
||||
#ifdef CONFIG_DEBUG_LOCKDEP
|
||||
DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused);
|
||||
|
|
|
|||
|
|
@ -600,7 +600,6 @@ struct rq {
|
|||
/* BKL stats */
|
||||
unsigned int bkl_count;
|
||||
#endif
|
||||
struct lock_class_key rq_lock_key;
|
||||
};
|
||||
|
||||
static DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
|
||||
|
|
@ -2759,10 +2758,10 @@ static void double_rq_lock(struct rq *rq1, struct rq *rq2)
|
|||
} else {
|
||||
if (rq1 < rq2) {
|
||||
spin_lock(&rq1->lock);
|
||||
spin_lock(&rq2->lock);
|
||||
spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
|
||||
} else {
|
||||
spin_lock(&rq2->lock);
|
||||
spin_lock(&rq1->lock);
|
||||
spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
|
||||
}
|
||||
}
|
||||
update_rq_clock(rq1);
|
||||
|
|
@ -2805,14 +2804,21 @@ static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
|
|||
if (busiest < this_rq) {
|
||||
spin_unlock(&this_rq->lock);
|
||||
spin_lock(&busiest->lock);
|
||||
spin_lock(&this_rq->lock);
|
||||
spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
|
||||
ret = 1;
|
||||
} else
|
||||
spin_lock(&busiest->lock);
|
||||
spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
|
||||
__releases(busiest->lock)
|
||||
{
|
||||
spin_unlock(&busiest->lock);
|
||||
lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
|
||||
}
|
||||
|
||||
/*
|
||||
* If dest_cpu is allowed for this process, migrate the task to it.
|
||||
* This is accomplished by forcing the cpu_allowed mask to only
|
||||
|
|
@ -3637,7 +3643,7 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
|
|||
ld_moved = move_tasks(this_rq, this_cpu, busiest,
|
||||
imbalance, sd, CPU_NEWLY_IDLE,
|
||||
&all_pinned);
|
||||
spin_unlock(&busiest->lock);
|
||||
double_unlock_balance(this_rq, busiest);
|
||||
|
||||
if (unlikely(all_pinned)) {
|
||||
cpu_clear(cpu_of(busiest), *cpus);
|
||||
|
|
@ -3752,7 +3758,7 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
|
|||
else
|
||||
schedstat_inc(sd, alb_failed);
|
||||
}
|
||||
spin_unlock(&target_rq->lock);
|
||||
double_unlock_balance(busiest_rq, target_rq);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NO_HZ
|
||||
|
|
@ -8000,7 +8006,6 @@ void __init sched_init(void)
|
|||
|
||||
rq = cpu_rq(i);
|
||||
spin_lock_init(&rq->lock);
|
||||
lockdep_set_class(&rq->lock, &rq->rq_lock_key);
|
||||
rq->nr_running = 0;
|
||||
init_cfs_rq(&rq->cfs, rq);
|
||||
init_rt_rq(&rq->rt, rq);
|
||||
|
|
|
|||
|
|
@ -861,6 +861,8 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
|
|||
#define RT_MAX_TRIES 3
|
||||
|
||||
static int double_lock_balance(struct rq *this_rq, struct rq *busiest);
|
||||
static void double_unlock_balance(struct rq *this_rq, struct rq *busiest);
|
||||
|
||||
static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
|
||||
|
||||
static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
|
||||
|
|
@ -1022,7 +1024,7 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
|
|||
break;
|
||||
|
||||
/* try again */
|
||||
spin_unlock(&lowest_rq->lock);
|
||||
double_unlock_balance(rq, lowest_rq);
|
||||
lowest_rq = NULL;
|
||||
}
|
||||
|
||||
|
|
@ -1091,7 +1093,7 @@ static int push_rt_task(struct rq *rq)
|
|||
|
||||
resched_task(lowest_rq->curr);
|
||||
|
||||
spin_unlock(&lowest_rq->lock);
|
||||
double_unlock_balance(rq, lowest_rq);
|
||||
|
||||
ret = 1;
|
||||
out:
|
||||
|
|
@ -1197,7 +1199,7 @@ static int pull_rt_task(struct rq *this_rq)
|
|||
|
||||
}
|
||||
skip:
|
||||
spin_unlock(&src_rq->lock);
|
||||
double_unlock_balance(this_rq, src_rq);
|
||||
}
|
||||
|
||||
return ret;
|
||||
|
|
|
|||
54
kernel/smp.c
54
kernel/smp.c
|
|
@ -260,6 +260,41 @@ void __smp_call_function_single(int cpu, struct call_single_data *data)
|
|||
generic_exec_single(cpu, data);
|
||||
}
|
||||
|
||||
/* Dummy function */
|
||||
static void quiesce_dummy(void *unused)
|
||||
{
|
||||
}
|
||||
|
||||
/*
|
||||
* Ensure stack based data used in call function mask is safe to free.
|
||||
*
|
||||
* This is needed by smp_call_function_mask when using on-stack data, because
|
||||
* a single call function queue is shared by all CPUs, and any CPU may pick up
|
||||
* the data item on the queue at any time before it is deleted. So we need to
|
||||
* ensure that all CPUs have transitioned through a quiescent state after
|
||||
* this call.
|
||||
*
|
||||
* This is a very slow function, implemented by sending synchronous IPIs to
|
||||
* all possible CPUs. For this reason, we have to alloc data rather than use
|
||||
* stack based data even in the case of synchronous calls. The stack based
|
||||
* data is then just used for deadlock/oom fallback which will be very rare.
|
||||
*
|
||||
* If a faster scheme can be made, we could go back to preferring stack based
|
||||
* data -- the data allocation/free is non-zero cost.
|
||||
*/
|
||||
static void smp_call_function_mask_quiesce_stack(cpumask_t mask)
|
||||
{
|
||||
struct call_single_data data;
|
||||
int cpu;
|
||||
|
||||
data.func = quiesce_dummy;
|
||||
data.info = NULL;
|
||||
data.flags = CSD_FLAG_WAIT;
|
||||
|
||||
for_each_cpu_mask(cpu, mask)
|
||||
generic_exec_single(cpu, &data);
|
||||
}
|
||||
|
||||
/**
|
||||
* smp_call_function_mask(): Run a function on a set of other CPUs.
|
||||
* @mask: The set of cpus to run on.
|
||||
|
|
@ -285,6 +320,7 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
|
|||
cpumask_t allbutself;
|
||||
unsigned long flags;
|
||||
int cpu, num_cpus;
|
||||
int slowpath = 0;
|
||||
|
||||
/* Can deadlock when called with interrupts disabled */
|
||||
WARN_ON(irqs_disabled());
|
||||
|
|
@ -306,15 +342,16 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
|
|||
return smp_call_function_single(cpu, func, info, wait);
|
||||
}
|
||||
|
||||
if (!wait) {
|
||||
data = kmalloc(sizeof(*data), GFP_ATOMIC);
|
||||
if (data)
|
||||
data->csd.flags = CSD_FLAG_ALLOC;
|
||||
}
|
||||
if (!data) {
|
||||
data = kmalloc(sizeof(*data), GFP_ATOMIC);
|
||||
if (data) {
|
||||
data->csd.flags = CSD_FLAG_ALLOC;
|
||||
if (wait)
|
||||
data->csd.flags |= CSD_FLAG_WAIT;
|
||||
} else {
|
||||
data = &d;
|
||||
data->csd.flags = CSD_FLAG_WAIT;
|
||||
wait = 1;
|
||||
slowpath = 1;
|
||||
}
|
||||
|
||||
spin_lock_init(&data->lock);
|
||||
|
|
@ -331,8 +368,11 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
|
|||
arch_send_call_function_ipi(mask);
|
||||
|
||||
/* optionally wait for the CPUs to complete */
|
||||
if (wait)
|
||||
if (wait) {
|
||||
csd_flag_wait(&data->csd);
|
||||
if (unlikely(slowpath))
|
||||
smp_call_function_mask_quiesce_stack(allbutself);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -292,6 +292,7 @@ void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
|
|||
}
|
||||
|
||||
EXPORT_SYMBOL(_spin_lock_nested);
|
||||
|
||||
unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
|
@ -314,6 +315,16 @@ unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclas
|
|||
|
||||
EXPORT_SYMBOL(_spin_lock_irqsave_nested);
|
||||
|
||||
void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
|
||||
struct lockdep_map *nest_lock)
|
||||
{
|
||||
preempt_disable();
|
||||
spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
|
||||
LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(_spin_lock_nest_lock);
|
||||
|
||||
#endif
|
||||
|
||||
void __lockfunc _spin_unlock(spinlock_t *lock)
|
||||
|
|
|
|||
|
|
@ -290,11 +290,11 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
|
|||
|
||||
BUG_ON(get_wq_data(work) != cwq);
|
||||
work_clear_pending(work);
|
||||
lock_acquire(&cwq->wq->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
|
||||
lock_acquire(&lockdep_map, 0, 0, 0, 2, _THIS_IP_);
|
||||
lock_map_acquire(&cwq->wq->lockdep_map);
|
||||
lock_map_acquire(&lockdep_map);
|
||||
f(work);
|
||||
lock_release(&lockdep_map, 1, _THIS_IP_);
|
||||
lock_release(&cwq->wq->lockdep_map, 1, _THIS_IP_);
|
||||
lock_map_release(&lockdep_map);
|
||||
lock_map_release(&cwq->wq->lockdep_map);
|
||||
|
||||
if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
|
||||
printk(KERN_ERR "BUG: workqueue leaked lock or atomic: "
|
||||
|
|
@ -413,8 +413,8 @@ void flush_workqueue(struct workqueue_struct *wq)
|
|||
int cpu;
|
||||
|
||||
might_sleep();
|
||||
lock_acquire(&wq->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
|
||||
lock_release(&wq->lockdep_map, 1, _THIS_IP_);
|
||||
lock_map_acquire(&wq->lockdep_map);
|
||||
lock_map_release(&wq->lockdep_map);
|
||||
for_each_cpu_mask_nr(cpu, *cpu_map)
|
||||
flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
|
||||
}
|
||||
|
|
@ -441,8 +441,8 @@ int flush_work(struct work_struct *work)
|
|||
if (!cwq)
|
||||
return 0;
|
||||
|
||||
lock_acquire(&cwq->wq->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
|
||||
lock_release(&cwq->wq->lockdep_map, 1, _THIS_IP_);
|
||||
lock_map_acquire(&cwq->wq->lockdep_map);
|
||||
lock_map_release(&cwq->wq->lockdep_map);
|
||||
|
||||
prev = NULL;
|
||||
spin_lock_irq(&cwq->lock);
|
||||
|
|
@ -536,8 +536,8 @@ static void wait_on_work(struct work_struct *work)
|
|||
|
||||
might_sleep();
|
||||
|
||||
lock_acquire(&work->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
|
||||
lock_release(&work->lockdep_map, 1, _THIS_IP_);
|
||||
lock_map_acquire(&work->lockdep_map);
|
||||
lock_map_release(&work->lockdep_map);
|
||||
|
||||
cwq = get_wq_data(work);
|
||||
if (!cwq)
|
||||
|
|
@ -872,8 +872,8 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
|
|||
if (cwq->thread == NULL)
|
||||
return;
|
||||
|
||||
lock_acquire(&cwq->wq->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
|
||||
lock_release(&cwq->wq->lockdep_map, 1, _THIS_IP_);
|
||||
lock_map_acquire(&cwq->wq->lockdep_map);
|
||||
lock_map_release(&cwq->wq->lockdep_map);
|
||||
|
||||
flush_cpu_workqueue(cwq);
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -8,6 +8,7 @@
|
|||
*
|
||||
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/module.h>
|
||||
|
|
@ -37,6 +38,7 @@ int debug_locks_off(void)
|
|||
{
|
||||
if (xchg(&debug_locks, 0)) {
|
||||
if (!debug_locks_silent) {
|
||||
oops_in_progress = 1;
|
||||
console_verbose();
|
||||
return 1;
|
||||
}
|
||||
|
|
|
|||
20
mm/mmap.c
20
mm/mmap.c
|
|
@ -2273,14 +2273,14 @@ int install_special_mapping(struct mm_struct *mm,
|
|||
|
||||
static DEFINE_MUTEX(mm_all_locks_mutex);
|
||||
|
||||
static void vm_lock_anon_vma(struct anon_vma *anon_vma)
|
||||
static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
|
||||
{
|
||||
if (!test_bit(0, (unsigned long *) &anon_vma->head.next)) {
|
||||
/*
|
||||
* The LSB of head.next can't change from under us
|
||||
* because we hold the mm_all_locks_mutex.
|
||||
*/
|
||||
spin_lock(&anon_vma->lock);
|
||||
spin_lock_nest_lock(&anon_vma->lock, &mm->mmap_sem);
|
||||
/*
|
||||
* We can safely modify head.next after taking the
|
||||
* anon_vma->lock. If some other vma in this mm shares
|
||||
|
|
@ -2296,7 +2296,7 @@ static void vm_lock_anon_vma(struct anon_vma *anon_vma)
|
|||
}
|
||||
}
|
||||
|
||||
static void vm_lock_mapping(struct address_space *mapping)
|
||||
static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
|
||||
{
|
||||
if (!test_bit(AS_MM_ALL_LOCKS, &mapping->flags)) {
|
||||
/*
|
||||
|
|
@ -2310,7 +2310,7 @@ static void vm_lock_mapping(struct address_space *mapping)
|
|||
*/
|
||||
if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags))
|
||||
BUG();
|
||||
spin_lock(&mapping->i_mmap_lock);
|
||||
spin_lock_nest_lock(&mapping->i_mmap_lock, &mm->mmap_sem);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -2358,11 +2358,17 @@ int mm_take_all_locks(struct mm_struct *mm)
|
|||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||||
if (signal_pending(current))
|
||||
goto out_unlock;
|
||||
if (vma->anon_vma)
|
||||
vm_lock_anon_vma(vma->anon_vma);
|
||||
if (vma->vm_file && vma->vm_file->f_mapping)
|
||||
vm_lock_mapping(vma->vm_file->f_mapping);
|
||||
vm_lock_mapping(mm, vma->vm_file->f_mapping);
|
||||
}
|
||||
|
||||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||||
if (signal_pending(current))
|
||||
goto out_unlock;
|
||||
if (vma->anon_vma)
|
||||
vm_lock_anon_vma(mm, vma->anon_vma);
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
|
||||
out_unlock:
|
||||
|
|
|
|||
Loading…
Reference in New Issue