/* * kernel/lockdep.c * * Runtime locking correctness validator * * Started by Ingo Molnar: * * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra * * this code maps all the lock dependencies as they occur in a live kernel * and will warn about the following classes of locking bugs: * * - lock inversion scenarios * - circular lock dependencies * - hardirq/softirq safe/unsafe locking bugs * * Bugs are reported even if the current locking scenario does not cause * any deadlock at this point. * * I.e. if anytime in the past two locks were taken in a different order, * even if it happened for another task, even if those were different * locks (but of the same class as this lock), this code will detect it. * * Thanks to Arjan van de Ven for coming up with the initial idea of * mapping lock dependencies runtime. */#define DISABLE_BRANCH_PROFILING#include <linux/mutex.h>#include <linux/sched.h>#include <linux/sched/clock.h>#include <linux/sched/task.h>#include <linux/sched/mm.h>#include <linux/delay.h>#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/spinlock.h>#include <linux/kallsyms.h>#include <linux/interrupt.h>#include <linux/stacktrace.h>#include <linux/debug_locks.h>#include <linux/irqflags.h>#include <linux/utsname.h>#include <linux/hash.h>#include <linux/ftrace.h>#include <linux/stringify.h>#include <linux/bitops.h>#include <linux/gfp.h>#include <linux/kmemcheck.h>#include <linux/random.h>#include <linux/jhash.h> #include <asm/sections.h> #include "lockdep_internals.h" #define CREATE_TRACE_POINTS#include <trace/events/lock.h> #ifdef CONFIG_LOCKDEP_CROSSRELEASE#include <linux/slab.h>#endif #ifdef CONFIG_PROVE_LOCKINGint prove_locking = 1;module_param(prove_locking, int, 0644);#else#define prove_locking 0#endif #ifdef CONFIG_LOCK_STATint lock_stat = 1;module_param(lock_stat, int, 0644);#else#define lock_stat 0#endif /* * lockdep_lock: protects the lockdep graph, the hashes and the * class/list/hash allocators. * * This is one of the rare exceptions where it's justified * to use a raw spinlock - we really dont want the spinlock * code to recurse back into the lockdep code... */static arch_spinlock_t lockdep_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; static int graph_lock(void){ arch_spin_lock(&lockdep_lock); /* * Make sure that if another CPU detected a bug while * walking the graph we dont change it (while the other * CPU is busy printing out stuff with the graph lock * dropped already) */ if (!debug_locks) { arch_spin_unlock(&lockdep_lock); return 0; } /* prevent any recursions within lockdep from causing deadlocks */ current->lockdep_recursion++; return 1;} static inline int graph_unlock(void){ if (debug_locks && !arch_spin_is_locked(&lockdep_lock)) { /* * The lockdep graph lock isn't locked while we expect it to * be, we're confused now, bye! */ return DEBUG_LOCKS_WARN_ON(1); } current->lockdep_recursion--; arch_spin_unlock(&lockdep_lock); return 0;} /* * Turn lock debugging off and return with 0 if it was off already, * and also release the graph lock: */static inline int debug_locks_off_graph_unlock(void){ int ret = debug_locks_off(); arch_spin_unlock(&lockdep_lock); return ret;} unsigned long nr_list_entries;static struct lock_list list_entries[MAX_LOCKDEP_ENTRIES]; /* * All data structures here are protected by the global debug_lock. * * Mutex key structs only get allocated, once during bootup, and never * get freed - this significantly simplifies the debugging code. */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) { /* * Someone passed in garbage, we give up. */ DEBUG_LOCKS_WARN_ON(1); return NULL; } return lock_classes + hlock->class_idx - 1;} #ifdef CONFIG_LOCK_STATstatic DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], cpu_lock_stats); static inline u64 lockstat_clock(void){ return local_clock();} static int lock_point(unsigned long points[], unsigned long ip){ int i; for (i = 0; i < LOCKSTAT_POINTS; i++) { if (points[i] == 0) { points[i] = ip; break; } if (points[i] == ip) break; } return i;} static void lock_time_inc(struct lock_time *lt, u64 time){ if (time > lt->max) lt->max = time; if (time < lt->min || !lt->nr) lt->min = time; lt->total += time; lt->nr++;} static inline void lock_time_add(struct lock_time *src, struct lock_time *dst){ if (!src->nr) return; if (src->max > dst->max) dst->max = src->max; if (src->min < dst->min || !dst->nr) dst->min = src->min; dst->total += src->total; dst->nr += src->nr;} struct lock_class_stats lock_stats(struct lock_class *class){ struct lock_class_stats stats; int cpu, i; memset(&stats, 0, sizeof(struct lock_class_stats)); for_each_possible_cpu(cpu) { struct lock_class_stats *pcs = &per_cpu(cpu_lock_stats, cpu)[class - lock_classes]; for (i = 0; i < ARRAY_SIZE(stats.contention_point); i++) stats.contention_point[i] += pcs->contention_point[i]; for (i = 0; i < ARRAY_SIZE(stats.contending_point); i++) stats.contending_point[i] += pcs->contending_point[i]; lock_time_add(&pcs->read_waittime, &stats.read_waittime); lock_time_add(&pcs->write_waittime, &stats.write_waittime); lock_time_add(&pcs->read_holdtime, &stats.read_holdtime); lock_time_add(&pcs->write_holdtime, &stats.write_holdtime); for (i = 0; i < ARRAY_SIZE(stats.bounces); i++) stats.bounces[i] += pcs->bounces[i]; } return stats;} void clear_lock_stats(struct lock_class *class){ int cpu; for_each_possible_cpu(cpu) { struct lock_class_stats *cpu_stats = &per_cpu(cpu_lock_stats, cpu)[class - lock_classes]; memset(cpu_stats, 0, sizeof(struct lock_class_stats)); } memset(class->contention_point, 0, sizeof(class->contention_point)); memset(class->contending_point, 0, sizeof(class->contending_point));} static struct lock_class_stats *get_lock_stats(struct lock_class *class){ return &get_cpu_var(cpu_lock_stats)[class - lock_classes];} static void put_lock_stats(struct lock_class_stats *stats){ put_cpu_var(cpu_lock_stats);} static void lock_release_holdtime(struct held_lock *hlock){ struct lock_class_stats *stats; u64 holdtime; if (!lock_stat) return; holdtime = lockstat_clock() - hlock->holdtime_stamp; stats = get_lock_stats(hlock_class(hlock)); if (hlock->read) lock_time_inc(&stats->read_holdtime, holdtime); else lock_time_inc(&stats->write_holdtime, holdtime); put_lock_stats(stats);}#elsestatic inline void lock_release_holdtime(struct held_lock *hlock){}#endif /* * We keep a global list of all lock classes. The list only grows, * never shrinks. The list is only accessed with the lockdep * spinlock lock held. */LIST_HEAD(all_lock_classes); /* * The lockdep classes are in a hash-table as well, for fast lookup: */#define CLASSHASH_BITS (MAX_LOCKDEP_KEYS_BITS - 1)#define CLASSHASH_SIZE (1UL << CLASSHASH_BITS)#define __classhashfn(key) hash_long((unsigned long)key, CLASSHASH_BITS)#define classhashentry(key) (classhash_table + __classhashfn((key))) static struct hlist_head classhash_table[CLASSHASH_SIZE]; /* * We put the lock dependency chains into a hash-table as well, to cache * their existence: */#define CHAINHASH_BITS (MAX_LOCKDEP_CHAINS_BITS-1)#define CHAINHASH_SIZE (1UL << CHAINHASH_BITS)#define __chainhashfn(chain) hash_long(chain, CHAINHASH_BITS)#define chainhashentry(chain) (chainhash_table + __chainhashfn((chain))) static struct hlist_head chainhash_table[CHAINHASH_SIZE]; /* * The hash key of the lock dependency chains is a hash itself too: * it's a hash of all locks taken up to that lock, including that lock. * It's a 64-bit hash, because it's important for the keys to be * unique. */static inline u64 iterate_chain_key(u64 key, u32 idx){ u32 k0 = key, k1 = key >> 32; __jhash_mix(idx, k0, k1); /* Macro that modifies arguments! */ return k0 | (u64)k1 << 32;} void lockdep_off(void){ current->lockdep_recursion++;}EXPORT_SYMBOL(lockdep_off); void lockdep_on(void){ current->lockdep_recursion--;}EXPORT_SYMBOL(lockdep_on); /* * Debugging switches: */ #define VERBOSE 0#define VERY_VERBOSE 0 #if VERBOSE# define HARDIRQ_VERBOSE 1# define SOFTIRQ_VERBOSE 1#else# define HARDIRQ_VERBOSE 0# define SOFTIRQ_VERBOSE 0#endif #if VERBOSE || HARDIRQ_VERBOSE || SOFTIRQ_VERBOSE/* * Quick filtering for interesting events: */static int class_filter(struct lock_class *class){#if 0 /* Example */ if (class->name_version == 1 && !strcmp(class->name, "lockname")) return 1; if (class->name_version == 1 && !strcmp(class->name, "&struct->lockfield")) return 1;#endif /* Filter everything else. 1 would be to allow everything else */ return 0;}#endif static int verbose(struct lock_class *class){#if VERBOSE return class_filter(class);#endif return 0;} /* * Stack-trace: tightly packed array of stack backtrace * addresses. Protected by the graph_lock. */unsigned long nr_stack_trace_entries;static unsigned long stack_trace[MAX_STACK_TRACE_ENTRIES]; static void print_lockdep_off(const char *bug_msg){ printk(KERN_DEBUG "%s\n", bug_msg); printk(KERN_DEBUG "turning off the locking correctness validator.\n");#ifdef CONFIG_LOCK_STAT printk(KERN_DEBUG "Please attach the output of /proc/lock_stat to the bug report\n");#endif} static int save_trace(struct stack_trace *trace){ trace->nr_entries = 0; trace->max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries; trace->entries = stack_trace + nr_stack_trace_entries; trace->skip = 3; save_stack_trace(trace); /* * Some daft arches put -1 at the end to indicate its a full trace. * * <rant> this is buggy anyway, since it takes a whole extra entry so a * complete trace that maxes out the entries provided will be reported * as incomplete, friggin useless </rant> */ if (trace->nr_entries != 0 && trace->entries[trace->nr_entries-1] == ULONG_MAX) trace->nr_entries--; trace->max_entries = trace->nr_entries; nr_stack_trace_entries += trace->nr_entries; if (nr_stack_trace_entries >= MAX_STACK_TRACE_ENTRIES-1) { if (!debug_locks_off_graph_unlock()) return 0; print_lockdep_off("BUG: MAX_STACK_TRACE_ENTRIES too low!"); dump_stack(); return 0; } return 1;} unsigned int nr_hardirq_chains;unsigned int nr_softirq_chains;unsigned int nr_process_chains;unsigned int max_lockdep_depth; #ifdef CONFIG_DEBUG_LOCKDEP/* * Various lockdep statistics: */DEFINE_PER_CPU(struct lockdep_stats, lockdep_stats);#endif /* * Locking printouts: */ #define __USAGE(__STATE) \ [LOCK_USED_IN_##__STATE] = "IN-"__stringify(__STATE)"-W", \ [LOCK_ENABLED_##__STATE] = __stringify(__STATE)"-ON-W", \ [LOCK_USED_IN_##__STATE##_READ] = "IN-"__stringify(__STATE)"-R",\ [LOCK_ENABLED_##__STATE##_READ] = __stringify(__STATE)"-ON-R", static const char *usage_str[] ={#define LOCKDEP_STATE(__STATE) __USAGE(__STATE)#include "lockdep_states.h"#undef LOCKDEP_STATE [LOCK_USED] = "INITIAL USE",}; const char * __get_key_name(struct lockdep_subclass_key *key, char *str){ return kallsyms_lookup((unsigned long)key, NULL, NULL, NULL, str);} static inline unsigned long lock_flag(enum lock_usage_bit bit){ return 1UL << bit;} static char get_usage_char(struct lock_class *class, enum lock_usage_bit bit){ char c = '.'; if (class->usage_mask & lock_flag(bit + 2)) c = '+'; if (class->usage_mask & lock_flag(bit)) { c = '-'; if (class->usage_mask & lock_flag(bit + 2)) c = '?'; } return c;} void get_usage_chars(struct lock_class *class, char usage[LOCK_USAGE_CHARS]){ int i = 0; #define LOCKDEP_STATE(__STATE) \ usage[i++] = get_usage_char(class, LOCK_USED_IN_##__STATE); \ usage[i++] = get_usage_char(class, LOCK_USED_IN_##__STATE##_READ);#include "lockdep_states.h"Lines 1–500 of 5152. 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/* * kernel/lockdep.c * * Runtime locking correctness validator * * Started by Ingo Molnar: * * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra * * this code maps all the lock dependencies as they occur in a live kernel * and will warn about the following classes of locking bugs: * * - lock inversion scenarios * - circular lock dependencies * - hardirq/softirq safe/unsafe locking bugs * * Bugs are reported even if the current locking scenario does not cause * any deadlock at this point. * * I.e. if anytime in the past two locks were taken in a different order, * even if it happened for another task, even if those were different * locks (but of the same class as this lock), this code will detect it. * * Thanks to Arjan van de Ven for coming up with the initial idea of * mapping lock dependencies runtime. */ #define DISABLE_BRANCH_PROFILING #include <linux/mutex.h> #include <linux/sched.h> #include <linux/sched/clock.h> #include <linux/sched/task.h> #include <linux/sched/mm.h> #include <linux/delay.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/spinlock.h> #include <linux/kallsyms.h> #include <linux/interrupt.h> #include <linux/stacktrace.h> #include <linux/debug_locks.h> #include <linux/irqflags.h> #include <linux/utsname.h> #include <linux/hash.h> #include <linux/ftrace.h> #include <linux/stringify.h> #include <linux/bitops.h> #include <linux/gfp.h> #include <linux/kmemcheck.h> #include <linux/random.h> #include <linux/jhash.h> #include <asm/sections.h> #include "lockdep_internals.h" #define CREATE_TRACE_POINTS #include <trace/events/lock.h> #ifdef CONFIG_LOCKDEP_CROSSRELEASE #include <linux/slab.h> #endif #ifdef CONFIG_PROVE_LOCKING int prove_locking = 1; module_param(prove_locking, int, 0644); #else #define prove_locking 0 #endif #ifdef CONFIG_LOCK_STAT int lock_stat = 1; module_param(lock_stat, int, 0644); #else #define lock_stat 0 #endif /* * lockdep_lock: protects the lockdep graph, the hashes and the * class/list/hash allocators. * * This is one of the rare exceptions where it's justified * to use a raw spinlock - we really dont want the spinlock * code to recurse back into the lockdep code... */ static arch_spinlock_t lockdep_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; static int graph_lock(void) { arch_spin_lock(&lockdep_lock); /* * Make sure that if another CPU detected a bug while * walking the graph we dont change it (while the other * CPU is busy printing out stuff with the graph lock * dropped already) */ if (!debug_locks) { arch_spin_unlock(&lockdep_lock); return 0; } /* prevent any recursions within lockdep from causing deadlocks */ current->lockdep_recursion++; return 1; } static inline int graph_unlock(void) { if (debug_locks && !arch_spin_is_locked(&lockdep_lock)) { /* * The lockdep graph lock isn't locked while we expect it to * be, we're confused now, bye! */ return DEBUG_LOCKS_WARN_ON(1); } current->lockdep_recursion--; arch_spin_unlock(&lockdep_lock); return 0; } /* * Turn lock debugging off and return with 0 if it was off already, * and also release the graph lock: */ static inline int debug_locks_off_graph_unlock(void) { int ret = debug_locks_off(); arch_spin_unlock(&lockdep_lock); return ret; } unsigned long nr_list_entries; static struct lock_list list_entries[MAX_LOCKDEP_ENTRIES]; /* * All data structures here are protected by the global debug_lock. * * Mutex key structs only get allocated, once during bootup, and never * get freed - this significantly simplifies the debugging code. */ 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) { /* * Someone passed in garbage, we give up. */ 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], cpu_lock_stats); static inline u64 lockstat_clock(void) { return local_clock(); } static int lock_point(unsigned long points[], unsigned long ip) { int i; for (i = 0; i < LOCKSTAT_POINTS; i++) { if (points[i] == 0) { points[i] = ip; break; } if (points[i] == ip) break; } return i; } static void lock_time_inc(struct lock_time *lt, u64 time) { if (time > lt->max) lt->max = time; if (time < lt->min || !lt->nr) lt->min = time; lt->total += time; lt->nr++; } static inline void lock_time_add(struct lock_time *src, struct lock_time *dst) { if (!src->nr) return; if (src->max > dst->max) dst->max = src->max; if (src->min < dst->min || !dst->nr) dst->min = src->min; dst->total += src->total; dst->nr += src->nr; } struct lock_class_stats lock_stats(struct lock_class *class) { struct lock_class_stats stats; int cpu, i; memset(&stats, 0, sizeof(struct lock_class_stats)); for_each_possible_cpu(cpu) { struct lock_class_stats *pcs = &per_cpu(cpu_lock_stats, cpu)[class - lock_classes]; for (i = 0; i < ARRAY_SIZE(stats.contention_point); i++) stats.contention_point[i] += pcs->contention_point[i]; for (i = 0; i < ARRAY_SIZE(stats.contending_point); i++) stats.contending_point[i] += pcs->contending_point[i]; lock_time_add(&pcs->read_waittime, &stats.read_waittime); lock_time_add(&pcs->write_waittime, &stats.write_waittime); lock_time_add(&pcs->read_holdtime, &stats.read_holdtime); lock_time_add(&pcs->write_holdtime, &stats.write_holdtime); for (i = 0; i < ARRAY_SIZE(stats.bounces); i++) stats.bounces[i] += pcs->bounces[i]; } return stats; } void clear_lock_stats(struct lock_class *class) { int cpu; for_each_possible_cpu(cpu) { struct lock_class_stats *cpu_stats = &per_cpu(cpu_lock_stats, cpu)[class - lock_classes]; memset(cpu_stats, 0, sizeof(struct lock_class_stats)); } memset(class->contention_point, 0, sizeof(class->contention_point)); memset(class->contending_point, 0, sizeof(class->contending_point)); } static struct lock_class_stats *get_lock_stats(struct lock_class *class) { return &get_cpu_var(cpu_lock_stats)[class - lock_classes]; } static void put_lock_stats(struct lock_class_stats *stats) { put_cpu_var(cpu_lock_stats); } static void lock_release_holdtime(struct held_lock *hlock) { struct lock_class_stats *stats; u64 holdtime; if (!lock_stat) return; holdtime = lockstat_clock() - hlock->holdtime_stamp; stats = get_lock_stats(hlock_class(hlock)); if (hlock->read) lock_time_inc(&stats->read_holdtime, holdtime); else lock_time_inc(&stats->write_holdtime, holdtime); put_lock_stats(stats); } #else static inline void lock_release_holdtime(struct held_lock *hlock) { } #endif /* * We keep a global list of all lock classes. The list only grows, * never shrinks. The list is only accessed with the lockdep * spinlock lock held. */ LIST_HEAD(all_lock_classes); /* * The lockdep classes are in a hash-table as well, for fast lookup: */ #define CLASSHASH_BITS (MAX_LOCKDEP_KEYS_BITS - 1) #define CLASSHASH_SIZE (1UL << CLASSHASH_BITS) #define __classhashfn(key) hash_long((unsigned long)key, CLASSHASH_BITS) #define classhashentry(key) (classhash_table + __classhashfn((key))) static struct hlist_head classhash_table[CLASSHASH_SIZE]; /* * We put the lock dependency chains into a hash-table as well, to cache * their existence: */ #define CHAINHASH_BITS (MAX_LOCKDEP_CHAINS_BITS-1) #define CHAINHASH_SIZE (1UL << CHAINHASH_BITS) #define __chainhashfn(chain) hash_long(chain, CHAINHASH_BITS) #define chainhashentry(chain) (chainhash_table + __chainhashfn((chain))) static struct hlist_head chainhash_table[CHAINHASH_SIZE]; /* * The hash key of the lock dependency chains is a hash itself too: * it's a hash of all locks taken up to that lock, including that lock. * It's a 64-bit hash, because it's important for the keys to be * unique. */ static inline u64 iterate_chain_key(u64 key, u32 idx) { u32 k0 = key, k1 = key >> 32; __jhash_mix(idx, k0, k1); /* Macro that modifies arguments! */ return k0 | (u64)k1 << 32; } void lockdep_off(void) { current->lockdep_recursion++; } EXPORT_SYMBOL(lockdep_off); void lockdep_on(void) { current->lockdep_recursion--; } EXPORT_SYMBOL(lockdep_on); /* * Debugging switches: */ #define VERBOSE 0 #define VERY_VERBOSE 0 #if VERBOSE # define HARDIRQ_VERBOSE 1 # define SOFTIRQ_VERBOSE 1 #else # define HARDIRQ_VERBOSE 0 # define SOFTIRQ_VERBOSE 0 #endif #if VERBOSE || HARDIRQ_VERBOSE || SOFTIRQ_VERBOSE /* * Quick filtering for interesting events: */ static int class_filter(struct lock_class *class) { #if 0 /* Example */ if (class->name_version == 1 && !strcmp(class->name, "lockname")) return 1; if (class->name_version == 1 && !strcmp(class->name, "&struct->lockfield")) return 1; #endif /* Filter everything else. 1 would be to allow everything else */ return 0; } #endif static int verbose(struct lock_class *class) { #if VERBOSE return class_filter(class); #endif return 0; } /* * Stack-trace: tightly packed array of stack backtrace * addresses. Protected by the graph_lock. */ unsigned long nr_stack_trace_entries; static unsigned long stack_trace[MAX_STACK_TRACE_ENTRIES]; static void print_lockdep_off(const char *bug_msg) { printk(KERN_DEBUG "%s\n", bug_msg); printk(KERN_DEBUG "turning off the locking correctness validator.\n"); #ifdef CONFIG_LOCK_STAT printk(KERN_DEBUG "Please attach the output of /proc/lock_stat to the bug report\n"); #endif } static int save_trace(struct stack_trace *trace) { trace->nr_entries = 0; trace->max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries; trace->entries = stack_trace + nr_stack_trace_entries; trace->skip = 3; save_stack_trace(trace); /* * Some daft arches put -1 at the end to indicate its a full trace. * * <rant> this is buggy anyway, since it takes a whole extra entry so a * complete trace that maxes out the entries provided will be reported * as incomplete, friggin useless </rant> */ if (trace->nr_entries != 0 && trace->entries[trace->nr_entries-1] == ULONG_MAX) trace->nr_entries--; trace->max_entries = trace->nr_entries; nr_stack_trace_entries += trace->nr_entries; if (nr_stack_trace_entries >= MAX_STACK_TRACE_ENTRIES-1) { if (!debug_locks_off_graph_unlock()) return 0; print_lockdep_off("BUG: MAX_STACK_TRACE_ENTRIES too low!"); dump_stack(); return 0; } return 1; } unsigned int nr_hardirq_chains; unsigned int nr_softirq_chains; unsigned int nr_process_chains; unsigned int max_lockdep_depth; #ifdef CONFIG_DEBUG_LOCKDEP /* * Various lockdep statistics: */ DEFINE_PER_CPU(struct lockdep_stats, lockdep_stats); #endif /* * Locking printouts: */ #define __USAGE(__STATE) \ [LOCK_USED_IN_##__STATE] = "IN-"__stringify(__STATE)"-W", \ [LOCK_ENABLED_##__STATE] = __stringify(__STATE)"-ON-W", \ [LOCK_USED_IN_##__STATE##_READ] = "IN-"__stringify(__STATE)"-R",\ [LOCK_ENABLED_##__STATE##_READ] = __stringify(__STATE)"-ON-R", static const char *usage_str[] = { #define LOCKDEP_STATE(__STATE) __USAGE(__STATE) #include "lockdep_states.h" #undef LOCKDEP_STATE [LOCK_USED] = "INITIAL USE", }; const char * __get_key_name(struct lockdep_subclass_key *key, char *str) { return kallsyms_lookup((unsigned long)key, NULL, NULL, NULL, str); } static inline unsigned long lock_flag(enum lock_usage_bit bit) { return 1UL << bit; } static char get_usage_char(struct lock_class *class, enum lock_usage_bit bit) { char c = '.'; if (class->usage_mask & lock_flag(bit + 2)) c = '+'; if (class->usage_mask & lock_flag(bit)) { c = '-'; if (class->usage_mask & lock_flag(bit + 2)) c = '?'; } return c; } void get_usage_chars(struct lock_class *class, char usage[LOCK_USAGE_CHARS]) { int i = 0; #define LOCKDEP_STATE(__STATE) \ usage[i++] = get_usage_char(class, LOCK_USED_IN_##__STATE); \ usage[i++] = get_usage_char(class, LOCK_USED_IN_##__STATE##_READ); #include "lockdep_states.h"