/* 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 ( 64 bit arch using 32 bit 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;
};
/*
* 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 (1 U << 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)->dep_map.name, (lock)->dep_map.key, sub,\
(lock)->dep_map.wait_type_inner, \
(lock)->dep_map.wait_type_outer, \
(lock)->dep_map.lock_type)
/**
* lockdep_set_novalidate_class : disable checking of lock ordering on a given
* lock
* @ lock : Lock to mark
*
* Lockdep will still record that this lock has been taken , and print held
* instances when dumping locks
*/
#define lockdep_set_novalidate_class(lock) \
lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock )
/**
* lockdep_set_notrack_class : disable lockdep tracking of a given lock entirely
* @ lock : Lock to mark
*
* Bigger hammer than lockdep_set_novalidate_class : so far just for bcachefs ,
* which takes more locks than lockdep is able to track ( 48 ) .
*/
#define lockdep_set_notrack_class(lock) \
lockdep_set_class_and_name(lock, &__lockdep_no_track__, #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 = 0 U, }
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 )
#define lockdep_set_notrack_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 )
extern void lockdep_assert_in_softirq_func(void );
#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 )
# define lockdep_assert_in_softirq_func() 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 */
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