/* * kernel/lockdep_internals.h * * Runtime locking correctness validator * * lockdep subsystem internal functions and variables. */ /* * Lock-class usage-state bits: */enum lock_usage_bit {#define LOCKDEP_STATE(__STATE)		\	LOCK_USED_IN_##__STATE,		\	LOCK_USED_IN_##__STATE##_READ,	\	LOCK_ENABLED_##__STATE,		\	LOCK_ENABLED_##__STATE##_READ,#include "lockdep_states.h"#undef LOCKDEP_STATE	LOCK_USED,	LOCK_USAGE_STATES}; /* * Usage-state bitmasks: */#define __LOCKF(__STATE)	LOCKF_##__STATE = (1 << LOCK_##__STATE), enum {#define LOCKDEP_STATE(__STATE)						\	__LOCKF(USED_IN_##__STATE)					\	__LOCKF(USED_IN_##__STATE##_READ)				\	__LOCKF(ENABLED_##__STATE)					\	__LOCKF(ENABLED_##__STATE##_READ)#include "lockdep_states.h"#undef LOCKDEP_STATE	__LOCKF(USED)}; #define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ) #define LOCKF_ENABLED_IRQ_READ \		(LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)#define LOCKF_USED_IN_IRQ_READ \		(LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ) /* * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies * we track. * * We use the per-lock dependency maps in two ways: we grow it by adding * every to-be-taken lock to all currently held lock's own dependency * table (if it's not there yet), and we check it for lock order * conflicts and deadlocks. */#define MAX_LOCKDEP_ENTRIES	16384UL #define MAX_LOCKDEP_CHAINS_BITS	15#define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS) #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5) /* * Stack-trace: tightly packed array of stack backtrace * addresses. Protected by the hash_lock. */#define MAX_STACK_TRACE_ENTRIES	262144UL extern struct list_head all_lock_classes;extern struct lock_chain lock_chains[]; #define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2) extern void get_usage_chars(struct lock_class *class,			    char usage[LOCK_USAGE_CHARS]); extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str); struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i); extern unsigned long nr_lock_classes;extern unsigned long nr_list_entries;extern unsigned long nr_lock_chains;extern int nr_chain_hlocks;extern unsigned long nr_stack_trace_entries; extern unsigned int nr_hardirq_chains;extern unsigned int nr_softirq_chains;extern unsigned int nr_process_chains;extern unsigned int max_lockdep_depth;extern unsigned int max_recursion_depth; extern unsigned int max_bfs_queue_depth; #ifdef CONFIG_PROVE_LOCKINGextern unsigned long lockdep_count_forward_deps(struct lock_class *);extern unsigned long lockdep_count_backward_deps(struct lock_class *);#elsestatic inline unsigned longlockdep_count_forward_deps(struct lock_class *class){	return 0;}static inline unsigned longlockdep_count_backward_deps(struct lock_class *class){	return 0;}#endif #ifdef CONFIG_DEBUG_LOCKDEP #include <asm/local.h>/* * Various lockdep statistics. * We want them per cpu as they are often accessed in fast path * and we want to avoid too much cache bouncing. */struct lockdep_stats {	int	chain_lookup_hits;	int	chain_lookup_misses;	int	hardirqs_on_events;	int	hardirqs_off_events;	int	redundant_hardirqs_on;	int	redundant_hardirqs_off;	int	softirqs_on_events;	int	softirqs_off_events;	int	redundant_softirqs_on;	int	redundant_softirqs_off;	int	nr_unused_locks;	int	nr_cyclic_checks;	int	nr_cyclic_check_recursions;	int	nr_find_usage_forwards_checks;	int	nr_find_usage_forwards_recursions;	int	nr_find_usage_backwards_checks;	int	nr_find_usage_backwards_recursions;}; DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats); #define __debug_atomic_inc(ptr)					\	this_cpu_inc(lockdep_stats.ptr); #define debug_atomic_inc(ptr)			{		\	WARN_ON_ONCE(!irqs_disabled());				\	__this_cpu_inc(lockdep_stats.ptr);			\} #define debug_atomic_dec(ptr)			{		\	WARN_ON_ONCE(!irqs_disabled());				\	__this_cpu_dec(lockdep_stats.ptr);			\} #define debug_atomic_read(ptr)		({				\	struct lockdep_stats *__cpu_lockdep_stats;			\	unsigned long long __total = 0;					\	int __cpu;							\	for_each_possible_cpu(__cpu) {					\		__cpu_lockdep_stats = &per_cpu(lockdep_stats, __cpu);	\		__total += __cpu_lockdep_stats->ptr;			\	}								\	__total;							\})#else# define __debug_atomic_inc(ptr)	do { } while (0)# define debug_atomic_inc(ptr)		do { } while (0)# define debug_atomic_dec(ptr)		do { } while (0)# define debug_atomic_read(ptr)		0#endif