debug_locks.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_DEBUG_LOCKING_H
#define __LINUX_DEBUG_LOCKING_H
 
#include <linux/atomic.h>
#include <linux/cache.h>
 
struct task_struct;
 
extern int debug_locks __read_mostly;
extern int debug_locks_silent __read_mostly;
 
 
static __always_inline int __debug_locks_off(void)
{
    return xchg(&debug_locks, 0);
}
 
/*
 * Generic 'turn off all lock debugging' function:
 */
extern int debug_locks_off(void);
 
#define DEBUG_LOCKS_WARN_ON(c)                      \
({                                  \
    int __ret = 0;                          \
                                    \
    if (!oops_in_progress && unlikely(c)) {             \
        instrumentation_begin();                \
        if (debug_locks_off() && !debug_locks_silent)       \
            WARN(1, "DEBUG_LOCKS_WARN_ON(%s)", #c);     \
        instrumentation_end();                  \
        __ret = 1;                      \
    }                               \
    __ret;                              \
})
 
#ifdef CONFIG_SMP
# define SMP_DEBUG_LOCKS_WARN_ON(c)         DEBUG_LOCKS_WARN_ON(c)
#else
# define SMP_DEBUG_LOCKS_WARN_ON(c)         do { } while (0)
#endif
 
#ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
  extern void locking_selftest(void);
#else
# define locking_selftest() do { } while (0)
#endif
 
#ifdef CONFIG_LOCKDEP
extern void debug_show_all_locks(void);
extern void debug_show_held_locks(struct task_struct *task);
extern void debug_check_no_locks_freed(const void *from, unsigned long len);
extern void debug_check_no_locks_held(void);
#else
static inline void debug_show_all_locks(void)
{
}
 
static inline void debug_show_held_locks(struct task_struct *task)
{
}
 
static inline void
debug_check_no_locks_freed(const void *from, unsigned long len)
{
}
 
static inline void
debug_check_no_locks_held(void)
{
}
#endif
 
#endif