Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef __LINUX_SMPLOCK_H |
2 | #define __LINUX_SMPLOCK_H | |
3 | ||
f037360f | 4 | #ifdef CONFIG_LOCK_KERNEL |
1da177e4 | 5 | #include <linux/sched.h> |
1da177e4 | 6 | |
1da177e4 LT |
7 | #define kernel_locked() (current->lock_depth >= 0) |
8 | ||
9 | extern int __lockfunc __reacquire_kernel_lock(void); | |
10 | extern void __lockfunc __release_kernel_lock(void); | |
11 | ||
12 | /* | |
13 | * Release/re-acquire global kernel lock for the scheduler | |
14 | */ | |
15 | #define release_kernel_lock(tsk) do { \ | |
16 | if (unlikely((tsk)->lock_depth >= 0)) \ | |
17 | __release_kernel_lock(); \ | |
18 | } while (0) | |
19 | ||
1da177e4 LT |
20 | static inline int reacquire_kernel_lock(struct task_struct *task) |
21 | { | |
22 | if (unlikely(task->lock_depth >= 0)) | |
6478d880 | 23 | return __reacquire_kernel_lock(); |
1da177e4 LT |
24 | return 0; |
25 | } | |
26 | ||
925936eb FW |
27 | extern void __lockfunc |
28 | _lock_kernel(const char *func, const char *file, int line) | |
29 | __acquires(kernel_lock); | |
96a2c464 | 30 | |
925936eb FW |
31 | extern void __lockfunc |
32 | _unlock_kernel(const char *func, const char *file, int line) | |
33 | __releases(kernel_lock); | |
96a2c464 | 34 | |
925936eb FW |
35 | #define lock_kernel() do { \ |
36 | _lock_kernel(__func__, __FILE__, __LINE__); \ | |
37 | } while (0) | |
38 | ||
39 | #define unlock_kernel() do { \ | |
40 | _unlock_kernel(__func__, __FILE__, __LINE__); \ | |
41 | } while (0) | |
1da177e4 | 42 | |
0b280676 JC |
43 | /* |
44 | * Various legacy drivers don't really need the BKL in a specific | |
45 | * function, but they *do* need to know that the BKL became available. | |
46 | * This function just avoids wrapping a bunch of lock/unlock pairs | |
47 | * around code which doesn't really need it. | |
48 | */ | |
49 | static inline void cycle_kernel_lock(void) | |
50 | { | |
51 | lock_kernel(); | |
52 | unlock_kernel(); | |
53 | } | |
54 | ||
1da177e4 LT |
55 | #else |
56 | ||
925936eb FW |
57 | #define lock_kernel() |
58 | #define unlock_kernel() | |
1da177e4 | 59 | #define release_kernel_lock(task) do { } while(0) |
0b280676 | 60 | #define cycle_kernel_lock() do { } while(0) |
1da177e4 LT |
61 | #define reacquire_kernel_lock(task) 0 |
62 | #define kernel_locked() 1 | |
63 | ||
64 | #endif /* CONFIG_LOCK_KERNEL */ | |
65 | #endif /* __LINUX_SMPLOCK_H */ |