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-rw-r--r--include/linux/lockdep.h699
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diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
new file mode 100644
index 000000000..dc2844b07
--- /dev/null
+++ b/include/linux/lockdep.h
@@ -0,0 +1,699 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Runtime locking correctness validator
+ *
+ * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
+ *
+ * see Documentation/locking/lockdep-design.rst for more details.
+ */
+#ifndef __LINUX_LOCKDEP_H
+#define __LINUX_LOCKDEP_H
+
+#include <linux/lockdep_types.h>
+#include <linux/smp.h>
+#include <asm/percpu.h>
+
+struct task_struct;
+
+#ifdef CONFIG_LOCKDEP
+
+#include <linux/linkage.h>
+#include <linux/list.h>
+#include <linux/debug_locks.h>
+#include <linux/stacktrace.h>
+
+static inline void lockdep_copy_map(struct lockdep_map *to,
+ struct lockdep_map *from)
+{
+ int i;
+
+ *to = *from;
+ /*
+ * Since the class cache can be modified concurrently we could observe
+ * half pointers (64bit arch using 32bit copy insns). Therefore clear
+ * the caches and take the performance hit.
+ *
+ * XXX it doesn't work well with lockdep_set_class_and_subclass(), since
+ * that relies on cache abuse.
+ */
+ for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
+ to->class_cache[i] = NULL;
+}
+
+/*
+ * Every lock has a list of other locks that were taken after it.
+ * We only grow the list, never remove from it:
+ */
+struct lock_list {
+ struct list_head entry;
+ struct lock_class *class;
+ struct lock_class *links_to;
+ const struct lock_trace *trace;
+ u16 distance;
+ /* bitmap of different dependencies from head to this */
+ u8 dep;
+ /* used by BFS to record whether "prev -> this" only has -(*R)-> */
+ u8 only_xr;
+
+ /*
+ * The parent field is used to implement breadth-first search, and the
+ * bit 0 is reused to indicate if the lock has been accessed in BFS.
+ */
+ struct lock_list *parent;
+};
+
+/**
+ * struct lock_chain - lock dependency chain record
+ *
+ * @irq_context: the same as irq_context in held_lock below
+ * @depth: the number of held locks in this chain
+ * @base: the index in chain_hlocks for this chain
+ * @entry: the collided lock chains in lock_chain hash list
+ * @chain_key: the hash key of this lock_chain
+ */
+struct lock_chain {
+ /* see BUILD_BUG_ON()s in add_chain_cache() */
+ unsigned int irq_context : 2,
+ depth : 6,
+ base : 24;
+ /* 4 byte hole */
+ struct hlist_node entry;
+ u64 chain_key;
+};
+
+#define MAX_LOCKDEP_KEYS_BITS 13
+#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
+#define INITIAL_CHAIN_KEY -1
+
+struct held_lock {
+ /*
+ * One-way hash of the dependency chain up to this point. We
+ * hash the hashes step by step as the dependency chain grows.
+ *
+ * We use it for dependency-caching and we skip detection
+ * passes and dependency-updates if there is a cache-hit, so
+ * it is absolutely critical for 100% coverage of the validator
+ * to have a unique key value for every unique dependency path
+ * that can occur in the system, to make a unique hash value
+ * as likely as possible - hence the 64-bit width.
+ *
+ * The task struct holds the current hash value (initialized
+ * with zero), here we store the previous hash value:
+ */
+ u64 prev_chain_key;
+ unsigned long acquire_ip;
+ struct lockdep_map *instance;
+ struct lockdep_map *nest_lock;
+#ifdef CONFIG_LOCK_STAT
+ u64 waittime_stamp;
+ u64 holdtime_stamp;
+#endif
+ /*
+ * class_idx is zero-indexed; it points to the element in
+ * lock_classes this held lock instance belongs to. class_idx is in
+ * the range from 0 to (MAX_LOCKDEP_KEYS-1) inclusive.
+ */
+ unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS;
+ /*
+ * The lock-stack is unified in that the lock chains of interrupt
+ * contexts nest ontop of process context chains, but we 'separate'
+ * the hashes by starting with 0 if we cross into an interrupt
+ * context, and we also keep do not add cross-context lock
+ * dependencies - the lock usage graph walking covers that area
+ * anyway, and we'd just unnecessarily increase the number of
+ * dependencies otherwise. [Note: hardirq and softirq contexts
+ * are separated from each other too.]
+ *
+ * The following field is used to detect when we cross into an
+ * interrupt context:
+ */
+ unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
+ unsigned int trylock:1; /* 16 bits */
+
+ unsigned int read:2; /* see lock_acquire() comment */
+ unsigned int check:1; /* see lock_acquire() comment */
+ unsigned int hardirqs_off:1;
+ unsigned int sync:1;
+ unsigned int references:11; /* 32 bits */
+ unsigned int pin_count;
+};
+
+/*
+ * Initialization, self-test and debugging-output methods:
+ */
+extern void lockdep_init(void);
+extern void lockdep_reset(void);
+extern void lockdep_reset_lock(struct lockdep_map *lock);
+extern void lockdep_free_key_range(void *start, unsigned long size);
+extern asmlinkage void lockdep_sys_exit(void);
+extern void lockdep_set_selftest_task(struct task_struct *task);
+
+extern void lockdep_init_task(struct task_struct *task);
+
+/*
+ * Split the recursion counter in two to readily detect 'off' vs recursion.
+ */
+#define LOCKDEP_RECURSION_BITS 16
+#define LOCKDEP_OFF (1U << LOCKDEP_RECURSION_BITS)
+#define LOCKDEP_RECURSION_MASK (LOCKDEP_OFF - 1)
+
+/*
+ * lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due
+ * to header dependencies.
+ */
+
+#define lockdep_off() \
+do { \
+ current->lockdep_recursion += LOCKDEP_OFF; \
+} while (0)
+
+#define lockdep_on() \
+do { \
+ current->lockdep_recursion -= LOCKDEP_OFF; \
+} while (0)
+
+extern void lockdep_register_key(struct lock_class_key *key);
+extern void lockdep_unregister_key(struct lock_class_key *key);
+
+/*
+ * These methods are used by specific locking variants (spinlocks,
+ * rwlocks, mutexes and rwsems) to pass init/acquire/release events
+ * to lockdep:
+ */
+
+extern void lockdep_init_map_type(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type);
+
+static inline void
+lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, int subclass, u8 inner, u8 outer)
+{
+ lockdep_init_map_type(lock, name, key, subclass, inner, outer, LD_LOCK_NORMAL);
+}
+
+static inline void
+lockdep_init_map_wait(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, int subclass, u8 inner)
+{
+ lockdep_init_map_waits(lock, name, key, subclass, inner, LD_WAIT_INV);
+}
+
+static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, int subclass)
+{
+ lockdep_init_map_wait(lock, name, key, subclass, LD_WAIT_INV);
+}
+
+/*
+ * Reinitialize a lock key - for cases where there is special locking or
+ * special initialization of locks so that the validator gets the scope
+ * of dependencies wrong: they are either too broad (they need a class-split)
+ * or they are too narrow (they suffer from a false class-split):
+ */
+#define lockdep_set_class(lock, key) \
+ lockdep_init_map_type(&(lock)->dep_map, #key, key, 0, \
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
+
+#define lockdep_set_class_and_name(lock, key, name) \
+ lockdep_init_map_type(&(lock)->dep_map, name, key, 0, \
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
+
+#define lockdep_set_class_and_subclass(lock, key, sub) \
+ lockdep_init_map_type(&(lock)->dep_map, #key, key, sub, \
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
+
+#define lockdep_set_subclass(lock, sub) \
+ lockdep_init_map_type(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
+
+#define lockdep_set_novalidate_class(lock) \
+ lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
+
+/*
+ * Compare locking classes
+ */
+#define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key)
+
+static inline int lockdep_match_key(struct lockdep_map *lock,
+ struct lock_class_key *key)
+{
+ return lock->key == key;
+}
+
+/*
+ * Acquire a lock.
+ *
+ * Values for "read":
+ *
+ * 0: exclusive (write) acquire
+ * 1: read-acquire (no recursion allowed)
+ * 2: read-acquire with same-instance recursion allowed
+ *
+ * Values for check:
+ *
+ * 0: simple checks (freeing, held-at-exit-time, etc.)
+ * 1: full validation
+ */
+extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
+ int trylock, int read, int check,
+ struct lockdep_map *nest_lock, unsigned long ip);
+
+extern void lock_release(struct lockdep_map *lock, unsigned long ip);
+
+extern void lock_sync(struct lockdep_map *lock, unsigned int subclass,
+ int read, int check, struct lockdep_map *nest_lock,
+ unsigned long ip);
+
+/* lock_is_held_type() returns */
+#define LOCK_STATE_UNKNOWN -1
+#define LOCK_STATE_NOT_HELD 0
+#define LOCK_STATE_HELD 1
+
+/*
+ * Same "read" as for lock_acquire(), except -1 means any.
+ */
+extern int lock_is_held_type(const struct lockdep_map *lock, int read);
+
+static inline int lock_is_held(const struct lockdep_map *lock)
+{
+ return lock_is_held_type(lock, -1);
+}
+
+#define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
+#define lockdep_is_held_type(lock, r) lock_is_held_type(&(lock)->dep_map, (r))
+
+extern void lock_set_class(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, unsigned int subclass,
+ unsigned long ip);
+
+#define lock_set_novalidate_class(l, n, i) \
+ lock_set_class(l, n, &__lockdep_no_validate__, 0, i)
+
+static inline void lock_set_subclass(struct lockdep_map *lock,
+ unsigned int subclass, unsigned long ip)
+{
+ lock_set_class(lock, lock->name, lock->key, subclass, ip);
+}
+
+extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
+
+#define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
+
+extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
+extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
+extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
+
+#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
+
+#define lockdep_assert(cond) \
+ do { WARN_ON(debug_locks && !(cond)); } while (0)
+
+#define lockdep_assert_once(cond) \
+ do { WARN_ON_ONCE(debug_locks && !(cond)); } while (0)
+
+#define lockdep_assert_held(l) \
+ lockdep_assert(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
+
+#define lockdep_assert_not_held(l) \
+ lockdep_assert(lockdep_is_held(l) != LOCK_STATE_HELD)
+
+#define lockdep_assert_held_write(l) \
+ lockdep_assert(lockdep_is_held_type(l, 0))
+
+#define lockdep_assert_held_read(l) \
+ lockdep_assert(lockdep_is_held_type(l, 1))
+
+#define lockdep_assert_held_once(l) \
+ lockdep_assert_once(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
+
+#define lockdep_assert_none_held_once() \
+ lockdep_assert_once(!current->lockdep_depth)
+
+#define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
+
+#define lockdep_pin_lock(l) lock_pin_lock(&(l)->dep_map)
+#define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c))
+#define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c))
+
+/*
+ * Must use lock_map_aquire_try() with override maps to avoid
+ * lockdep thinking they participate in the block chain.
+ */
+#define DEFINE_WAIT_OVERRIDE_MAP(_name, _wait_type) \
+ struct lockdep_map _name = { \
+ .name = #_name "-wait-type-override", \
+ .wait_type_inner = _wait_type, \
+ .lock_type = LD_LOCK_WAIT_OVERRIDE, }
+
+#else /* !CONFIG_LOCKDEP */
+
+static inline void lockdep_init_task(struct task_struct *task)
+{
+}
+
+static inline void lockdep_off(void)
+{
+}
+
+static inline void lockdep_on(void)
+{
+}
+
+static inline void lockdep_set_selftest_task(struct task_struct *task)
+{
+}
+
+# define lock_acquire(l, s, t, r, c, n, i) do { } while (0)
+# define lock_release(l, i) do { } while (0)
+# define lock_downgrade(l, i) do { } while (0)
+# define lock_set_class(l, n, key, s, i) do { (void)(key); } while (0)
+# define lock_set_novalidate_class(l, n, i) do { } while (0)
+# define lock_set_subclass(l, s, i) do { } while (0)
+# define lockdep_init() do { } while (0)
+# define lockdep_init_map_type(lock, name, key, sub, inner, outer, type) \
+ do { (void)(name); (void)(key); } while (0)
+# define lockdep_init_map_waits(lock, name, key, sub, inner, outer) \
+ do { (void)(name); (void)(key); } while (0)
+# define lockdep_init_map_wait(lock, name, key, sub, inner) \
+ do { (void)(name); (void)(key); } while (0)
+# define lockdep_init_map(lock, name, key, sub) \
+ do { (void)(name); (void)(key); } while (0)
+# define lockdep_set_class(lock, key) do { (void)(key); } while (0)
+# define lockdep_set_class_and_name(lock, key, name) \
+ do { (void)(key); (void)(name); } while (0)
+#define lockdep_set_class_and_subclass(lock, key, sub) \
+ do { (void)(key); } while (0)
+#define lockdep_set_subclass(lock, sub) do { } while (0)
+
+#define lockdep_set_novalidate_class(lock) do { } while (0)
+
+/*
+ * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
+ * case since the result is not well defined and the caller should rather
+ * #ifdef the call himself.
+ */
+
+# define lockdep_reset() do { debug_locks = 1; } while (0)
+# define lockdep_free_key_range(start, size) do { } while (0)
+# define lockdep_sys_exit() do { } while (0)
+
+static inline void lockdep_register_key(struct lock_class_key *key)
+{
+}
+
+static inline void lockdep_unregister_key(struct lock_class_key *key)
+{
+}
+
+#define lockdep_depth(tsk) (0)
+
+/*
+ * Dummy forward declarations, allow users to write less ifdef-y code
+ * and depend on dead code elimination.
+ */
+extern int lock_is_held(const void *);
+extern int lockdep_is_held(const void *);
+#define lockdep_is_held_type(l, r) (1)
+
+#define lockdep_assert(c) do { } while (0)
+#define lockdep_assert_once(c) do { } while (0)
+
+#define lockdep_assert_held(l) do { (void)(l); } while (0)
+#define lockdep_assert_not_held(l) do { (void)(l); } while (0)
+#define lockdep_assert_held_write(l) do { (void)(l); } while (0)
+#define lockdep_assert_held_read(l) do { (void)(l); } while (0)
+#define lockdep_assert_held_once(l) do { (void)(l); } while (0)
+#define lockdep_assert_none_held_once() do { } while (0)
+
+#define lockdep_recursing(tsk) (0)
+
+#define NIL_COOKIE (struct pin_cookie){ }
+
+#define lockdep_pin_lock(l) ({ struct pin_cookie cookie = { }; cookie; })
+#define lockdep_repin_lock(l, c) do { (void)(l); (void)(c); } while (0)
+#define lockdep_unpin_lock(l, c) do { (void)(l); (void)(c); } while (0)
+
+#define DEFINE_WAIT_OVERRIDE_MAP(_name, _wait_type) \
+ struct lockdep_map __maybe_unused _name = {}
+
+#endif /* !LOCKDEP */
+
+#ifdef CONFIG_PROVE_LOCKING
+void lockdep_set_lock_cmp_fn(struct lockdep_map *, lock_cmp_fn, lock_print_fn);
+
+#define lock_set_cmp_fn(lock, ...) lockdep_set_lock_cmp_fn(&(lock)->dep_map, __VA_ARGS__)
+#else
+#define lock_set_cmp_fn(lock, ...) do { } while (0)
+#endif
+
+enum xhlock_context_t {
+ XHLOCK_HARD,
+ XHLOCK_SOFT,
+ XHLOCK_CTX_NR,
+};
+
+/*
+ * To initialize a lockdep_map statically use this macro.
+ * Note that _name must not be NULL.
+ */
+#define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
+ { .name = (_name), .key = (void *)(_key), }
+
+static inline void lockdep_invariant_state(bool force) {}
+static inline void lockdep_free_task(struct task_struct *task) {}
+
+#ifdef CONFIG_LOCK_STAT
+
+extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
+extern void lock_acquired(struct lockdep_map *lock, unsigned long ip);
+
+#define LOCK_CONTENDED(_lock, try, lock) \
+do { \
+ if (!try(_lock)) { \
+ lock_contended(&(_lock)->dep_map, _RET_IP_); \
+ lock(_lock); \
+ } \
+ lock_acquired(&(_lock)->dep_map, _RET_IP_); \
+} while (0)
+
+#define LOCK_CONTENDED_RETURN(_lock, try, lock) \
+({ \
+ int ____err = 0; \
+ if (!try(_lock)) { \
+ lock_contended(&(_lock)->dep_map, _RET_IP_); \
+ ____err = lock(_lock); \
+ } \
+ if (!____err) \
+ lock_acquired(&(_lock)->dep_map, _RET_IP_); \
+ ____err; \
+})
+
+#else /* CONFIG_LOCK_STAT */
+
+#define lock_contended(lockdep_map, ip) do {} while (0)
+#define lock_acquired(lockdep_map, ip) do {} while (0)
+
+#define LOCK_CONTENDED(_lock, try, lock) \
+ lock(_lock)
+
+#define LOCK_CONTENDED_RETURN(_lock, try, lock) \
+ lock(_lock)
+
+#endif /* CONFIG_LOCK_STAT */
+
+#ifdef CONFIG_PROVE_LOCKING
+extern void print_irqtrace_events(struct task_struct *curr);
+#else
+static inline void print_irqtrace_events(struct task_struct *curr)
+{
+}
+#endif
+
+/* Variable used to make lockdep treat read_lock() as recursive in selftests */
+#ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
+extern unsigned int force_read_lock_recursive;
+#else /* CONFIG_DEBUG_LOCKING_API_SELFTESTS */
+#define force_read_lock_recursive 0
+#endif /* CONFIG_DEBUG_LOCKING_API_SELFTESTS */
+
+#ifdef CONFIG_LOCKDEP
+extern bool read_lock_is_recursive(void);
+#else /* CONFIG_LOCKDEP */
+/* If !LOCKDEP, the value is meaningless */
+#define read_lock_is_recursive() 0
+#endif
+
+/*
+ * For trivial one-depth nesting of a lock-class, the following
+ * global define can be used. (Subsystems with multiple levels
+ * of nesting should define their own lock-nesting subclasses.)
+ */
+#define SINGLE_DEPTH_NESTING 1
+
+/*
+ * Map the dependency ops to NOP or to real lockdep ops, depending
+ * on the per lock-class debug mode:
+ */
+
+#define lock_acquire_exclusive(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
+#define lock_acquire_shared(l, s, t, n, i) lock_acquire(l, s, t, 1, 1, n, i)
+#define lock_acquire_shared_recursive(l, s, t, n, i) lock_acquire(l, s, t, 2, 1, n, i)
+
+#define spin_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define spin_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
+#define spin_release(l, i) lock_release(l, i)
+
+#define rwlock_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define rwlock_acquire_read(l, s, t, i) \
+do { \
+ if (read_lock_is_recursive()) \
+ lock_acquire_shared_recursive(l, s, t, NULL, i); \
+ else \
+ lock_acquire_shared(l, s, t, NULL, i); \
+} while (0)
+
+#define rwlock_release(l, i) lock_release(l, i)
+
+#define seqcount_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define seqcount_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
+#define seqcount_release(l, i) lock_release(l, i)
+
+#define mutex_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define mutex_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
+#define mutex_release(l, i) lock_release(l, i)
+
+#define rwsem_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define rwsem_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
+#define rwsem_acquire_read(l, s, t, i) lock_acquire_shared(l, s, t, NULL, i)
+#define rwsem_release(l, i) lock_release(l, i)
+
+#define lock_map_acquire(l) lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
+#define lock_map_acquire_try(l) lock_acquire_exclusive(l, 0, 1, NULL, _THIS_IP_)
+#define lock_map_acquire_read(l) lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
+#define lock_map_acquire_tryread(l) lock_acquire_shared_recursive(l, 0, 1, NULL, _THIS_IP_)
+#define lock_map_release(l) lock_release(l, _THIS_IP_)
+#define lock_map_sync(l) lock_sync(l, 0, 0, 1, NULL, _THIS_IP_)
+
+#ifdef CONFIG_PROVE_LOCKING
+# define might_lock(lock) \
+do { \
+ typecheck(struct lockdep_map *, &(lock)->dep_map); \
+ lock_acquire(&(lock)->dep_map, 0, 0, 0, 1, NULL, _THIS_IP_); \
+ lock_release(&(lock)->dep_map, _THIS_IP_); \
+} while (0)
+# define might_lock_read(lock) \
+do { \
+ typecheck(struct lockdep_map *, &(lock)->dep_map); \
+ lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_); \
+ lock_release(&(lock)->dep_map, _THIS_IP_); \
+} while (0)
+# define might_lock_nested(lock, subclass) \
+do { \
+ typecheck(struct lockdep_map *, &(lock)->dep_map); \
+ lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL, \
+ _THIS_IP_); \
+ lock_release(&(lock)->dep_map, _THIS_IP_); \
+} while (0)
+
+DECLARE_PER_CPU(int, hardirqs_enabled);
+DECLARE_PER_CPU(int, hardirq_context);
+DECLARE_PER_CPU(unsigned int, lockdep_recursion);
+
+#define __lockdep_enabled (debug_locks && !this_cpu_read(lockdep_recursion))
+
+#define lockdep_assert_irqs_enabled() \
+do { \
+ WARN_ON_ONCE(__lockdep_enabled && !this_cpu_read(hardirqs_enabled)); \
+} while (0)
+
+#define lockdep_assert_irqs_disabled() \
+do { \
+ WARN_ON_ONCE(__lockdep_enabled && this_cpu_read(hardirqs_enabled)); \
+} while (0)
+
+#define lockdep_assert_in_irq() \
+do { \
+ WARN_ON_ONCE(__lockdep_enabled && !this_cpu_read(hardirq_context)); \
+} while (0)
+
+#define lockdep_assert_no_hardirq() \
+do { \
+ WARN_ON_ONCE(__lockdep_enabled && (this_cpu_read(hardirq_context) || \
+ !this_cpu_read(hardirqs_enabled))); \
+} while (0)
+
+#define lockdep_assert_preemption_enabled() \
+do { \
+ WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT) && \
+ __lockdep_enabled && \
+ (preempt_count() != 0 || \
+ !this_cpu_read(hardirqs_enabled))); \
+} while (0)
+
+#define lockdep_assert_preemption_disabled() \
+do { \
+ WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT) && \
+ __lockdep_enabled && \
+ (preempt_count() == 0 && \
+ this_cpu_read(hardirqs_enabled))); \
+} while (0)
+
+/*
+ * Acceptable for protecting per-CPU resources accessed from BH.
+ * Much like in_softirq() - semantics are ambiguous, use carefully.
+ */
+#define lockdep_assert_in_softirq() \
+do { \
+ WARN_ON_ONCE(__lockdep_enabled && \
+ (!in_softirq() || in_irq() || in_nmi())); \
+} while (0)
+
+#else
+# define might_lock(lock) do { } while (0)
+# define might_lock_read(lock) do { } while (0)
+# define might_lock_nested(lock, subclass) do { } while (0)
+
+# define lockdep_assert_irqs_enabled() do { } while (0)
+# define lockdep_assert_irqs_disabled() do { } while (0)
+# define lockdep_assert_in_irq() do { } while (0)
+# define lockdep_assert_no_hardirq() do { } while (0)
+
+# define lockdep_assert_preemption_enabled() do { } while (0)
+# define lockdep_assert_preemption_disabled() do { } while (0)
+# define lockdep_assert_in_softirq() do { } while (0)
+#endif
+
+#ifdef CONFIG_PROVE_RAW_LOCK_NESTING
+
+# define lockdep_assert_RT_in_threaded_ctx() do { \
+ WARN_ONCE(debug_locks && !current->lockdep_recursion && \
+ lockdep_hardirq_context() && \
+ !(current->hardirq_threaded || current->irq_config), \
+ "Not in threaded context on PREEMPT_RT as expected\n"); \
+} while (0)
+
+#else
+
+# define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
+
+#endif
+
+#ifdef CONFIG_LOCKDEP
+void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
+#else
+static inline void
+lockdep_rcu_suspicious(const char *file, const int line, const char *s)
+{
+}
+#endif
+
+#endif /* __LINUX_LOCKDEP_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 15:18:00 +0000