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f82b217e35
struct held_lock {
u64 prev_chain_key; /* 0 8 */
struct lock_class * class; /* 8 8 */
long unsigned int acquire_ip; /* 16 8 */
struct lockdep_map * instance; /* 24 8 */
int irq_context; /* 32 4 */
int trylock; /* 36 4 */
int read; /* 40 4 */
int check; /* 44 4 */
int hardirqs_off; /* 48 4 */
/* size: 56, cachelines: 1 */
/* padding: 4 */
/* last cacheline: 56 bytes */
};
struct held_lock {
u64 prev_chain_key; /* 0 8 */
long unsigned int acquire_ip; /* 8 8 */
struct lockdep_map * instance; /* 16 8 */
unsigned int class_idx:11; /* 24:21 4 */
unsigned int irq_context:2; /* 24:19 4 */
unsigned int trylock:1; /* 24:18 4 */
unsigned int read:2; /* 24:16 4 */
unsigned int check:2; /* 24:14 4 */
unsigned int hardirqs_off:1; /* 24:13 4 */
/* size: 32, cachelines: 1 */
/* padding: 4 */
/* bit_padding: 13 bits */
/* last cacheline: 32 bytes */
};
[mingo@elte.hu: shrunk hlock->class too]
[peterz@infradead.org: fixup bit sizes]
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/*
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* kernel/lockdep_internals.h
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*
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* Runtime locking correctness validator
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*
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* lockdep subsystem internal functions and variables.
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*/
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/*
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* MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
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* we track.
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*
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* We use the per-lock dependency maps in two ways: we grow it by adding
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* every to-be-taken lock to all currently held lock's own dependency
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* table (if it's not there yet), and we check it for lock order
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* conflicts and deadlocks.
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*/
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#define MAX_LOCKDEP_ENTRIES 8192UL
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#define MAX_LOCKDEP_CHAINS_BITS 14
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#define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
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#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
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/*
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* Stack-trace: tightly packed array of stack backtrace
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* addresses. Protected by the hash_lock.
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*/
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#define MAX_STACK_TRACE_ENTRIES 262144UL
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extern struct list_head all_lock_classes;
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extern struct lock_chain lock_chains[];
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extern void
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get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
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extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
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struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
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extern unsigned long nr_lock_classes;
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extern unsigned long nr_list_entries;
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extern unsigned long nr_lock_chains;
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extern int nr_chain_hlocks;
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extern unsigned long nr_stack_trace_entries;
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extern unsigned int nr_hardirq_chains;
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extern unsigned int nr_softirq_chains;
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extern unsigned int nr_process_chains;
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extern unsigned int max_lockdep_depth;
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extern unsigned int max_recursion_depth;
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extern unsigned long lockdep_count_forward_deps(struct lock_class *);
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extern unsigned long lockdep_count_backward_deps(struct lock_class *);
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#ifdef CONFIG_DEBUG_LOCKDEP
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/*
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* Various lockdep statistics:
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*/
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extern atomic_t chain_lookup_hits;
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extern atomic_t chain_lookup_misses;
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extern atomic_t hardirqs_on_events;
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extern atomic_t hardirqs_off_events;
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extern atomic_t redundant_hardirqs_on;
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extern atomic_t redundant_hardirqs_off;
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extern atomic_t softirqs_on_events;
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extern atomic_t softirqs_off_events;
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extern atomic_t redundant_softirqs_on;
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extern atomic_t redundant_softirqs_off;
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extern atomic_t nr_unused_locks;
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extern atomic_t nr_cyclic_checks;
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extern atomic_t nr_cyclic_check_recursions;
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extern atomic_t nr_find_usage_forwards_checks;
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extern atomic_t nr_find_usage_forwards_recursions;
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extern atomic_t nr_find_usage_backwards_checks;
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extern atomic_t nr_find_usage_backwards_recursions;
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# define debug_atomic_inc(ptr) atomic_inc(ptr)
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# define debug_atomic_dec(ptr) atomic_dec(ptr)
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# define debug_atomic_read(ptr) atomic_read(ptr)
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#else
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# define debug_atomic_inc(ptr) do { } while (0)
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# define debug_atomic_dec(ptr) do { } while (0)
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# define debug_atomic_read(ptr) 0
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#endif
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