mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:16:39 +07:00
a4fc7ab1d0
Let's switch mutex_debug_check_no_locks_freed() to take (addr, len) as arguments instead, since all its callers were just calculating the 'to' address for themselves anyway... (and sometimes doing so badly). Signed-off-by: David Woodhouse <dwmw2@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/*
|
|
* Mutexes: blocking mutual exclusion locks
|
|
*
|
|
* started by Ingo Molnar:
|
|
*
|
|
* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*
|
|
* This file contains the main data structure and API definitions.
|
|
*/
|
|
#ifndef __LINUX_MUTEX_H
|
|
#define __LINUX_MUTEX_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock_types.h>
|
|
#include <linux/linkage.h>
|
|
|
|
#include <asm/atomic.h>
|
|
|
|
/*
|
|
* Simple, straightforward mutexes with strict semantics:
|
|
*
|
|
* - only one task can hold the mutex at a time
|
|
* - only the owner can unlock the mutex
|
|
* - multiple unlocks are not permitted
|
|
* - recursive locking is not permitted
|
|
* - a mutex object must be initialized via the API
|
|
* - a mutex object must not be initialized via memset or copying
|
|
* - task may not exit with mutex held
|
|
* - memory areas where held locks reside must not be freed
|
|
* - held mutexes must not be reinitialized
|
|
* - mutexes may not be used in irq contexts
|
|
*
|
|
* These semantics are fully enforced when DEBUG_MUTEXES is
|
|
* enabled. Furthermore, besides enforcing the above rules, the mutex
|
|
* debugging code also implements a number of additional features
|
|
* that make lock debugging easier and faster:
|
|
*
|
|
* - uses symbolic names of mutexes, whenever they are printed in debug output
|
|
* - point-of-acquire tracking, symbolic lookup of function names
|
|
* - list of all locks held in the system, printout of them
|
|
* - owner tracking
|
|
* - detects self-recursing locks and prints out all relevant info
|
|
* - detects multi-task circular deadlocks and prints out all affected
|
|
* locks and tasks (and only those tasks)
|
|
*/
|
|
struct mutex {
|
|
/* 1: unlocked, 0: locked, negative: locked, possible waiters */
|
|
atomic_t count;
|
|
spinlock_t wait_lock;
|
|
struct list_head wait_list;
|
|
#ifdef CONFIG_DEBUG_MUTEXES
|
|
struct thread_info *owner;
|
|
struct list_head held_list;
|
|
unsigned long acquire_ip;
|
|
const char *name;
|
|
void *magic;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* This is the control structure for tasks blocked on mutex,
|
|
* which resides on the blocked task's kernel stack:
|
|
*/
|
|
struct mutex_waiter {
|
|
struct list_head list;
|
|
struct task_struct *task;
|
|
#ifdef CONFIG_DEBUG_MUTEXES
|
|
struct mutex *lock;
|
|
void *magic;
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_DEBUG_MUTEXES
|
|
# include <linux/mutex-debug.h>
|
|
#else
|
|
# define __DEBUG_MUTEX_INITIALIZER(lockname)
|
|
# define mutex_init(mutex) __mutex_init(mutex, NULL)
|
|
# define mutex_destroy(mutex) do { } while (0)
|
|
# define mutex_debug_show_all_locks() do { } while (0)
|
|
# define mutex_debug_show_held_locks(p) do { } while (0)
|
|
# define mutex_debug_check_no_locks_held(task) do { } while (0)
|
|
# define mutex_debug_check_no_locks_freed(from, len) do { } while (0)
|
|
#endif
|
|
|
|
#define __MUTEX_INITIALIZER(lockname) \
|
|
{ .count = ATOMIC_INIT(1) \
|
|
, .wait_lock = SPIN_LOCK_UNLOCKED \
|
|
, .wait_list = LIST_HEAD_INIT(lockname.wait_list) \
|
|
__DEBUG_MUTEX_INITIALIZER(lockname) }
|
|
|
|
#define DEFINE_MUTEX(mutexname) \
|
|
struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
|
|
|
|
extern void fastcall __mutex_init(struct mutex *lock, const char *name);
|
|
|
|
/***
|
|
* mutex_is_locked - is the mutex locked
|
|
* @lock: the mutex to be queried
|
|
*
|
|
* Returns 1 if the mutex is locked, 0 if unlocked.
|
|
*/
|
|
static inline int fastcall mutex_is_locked(struct mutex *lock)
|
|
{
|
|
return atomic_read(&lock->count) != 1;
|
|
}
|
|
|
|
/*
|
|
* See kernel/mutex.c for detailed documentation of these APIs.
|
|
* Also see Documentation/mutex-design.txt.
|
|
*/
|
|
extern void fastcall mutex_lock(struct mutex *lock);
|
|
extern int fastcall mutex_lock_interruptible(struct mutex *lock);
|
|
/*
|
|
* NOTE: mutex_trylock() follows the spin_trylock() convention,
|
|
* not the down_trylock() convention!
|
|
*/
|
|
extern int fastcall mutex_trylock(struct mutex *lock);
|
|
extern void fastcall mutex_unlock(struct mutex *lock);
|
|
|
|
#endif
|