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Release 4.15 kernel/locking/lockdep_internals.h

Directory: kernel/locking
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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)

/*
 * CONFIG_LOCKDEP_SMALL is defined for sparc. Sparc requires .text,
 * .data and .bss to fit in required 32MB limit for the kernel. With
 * CONFIG_LOCKDEP we could go over this limit and cause system boot-up problems.
 * So, reduce the static allocations for lockdeps related structures so that
 * everything fits in current required size limit.
 */
#ifdef CONFIG_LOCKDEP_SMALL
/*
 * 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_STACK_TRACE_ENTRIES	262144UL
#else

#define MAX_LOCKDEP_ENTRIES	32768UL


#define MAX_LOCKDEP_CHAINS_BITS	16

/*
 * Stack-trace: tightly packed array of stack backtrace
 * addresses. Protected by the hash_lock.
 */

#define MAX_STACK_TRACE_ENTRIES	524288UL
#endif


#define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)


#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)

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_LOCKING
extern unsigned long lockdep_count_forward_deps(struct lock_class *);
extern unsigned long lockdep_count_backward_deps(struct lock_class *);
#else

static inline unsigned long lockdep_count_forward_deps(struct lock_class *class) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar16100.00%1100.00%
Total16100.00%1100.00%


static inline unsigned long lockdep_count_backward_deps(struct lock_class *class) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar16100.00%1100.00%
Total16100.00%1100.00%

#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_redundant_checks; int nr_redundant; 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

Overall Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar21149.41%211.76%
Peter Zijlstra9021.08%529.41%
Frédéric Weisbecker5212.18%317.65%
Huang Ying266.09%211.76%
Babu Moger245.62%15.88%
David S. Miller204.68%15.88%
Daniel Jordan20.47%15.88%
Greg Kroah-Hartman10.23%15.88%
Sasha Levin10.23%15.88%
Total427100.00%17100.00%
Directory: kernel/locking
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