projects / deliverable / linux.git / blame
| 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 | extern int __lockfunc __reacquire_kernel_lock(void); |
| 8 | extern void __lockfunc __release_kernel_lock(void); | |
| 9 | ||
| 10 | /* | |
| 11 | * Release/re-acquire global kernel lock for the scheduler | |
| 12 | */ | |
| 13 | #define release_kernel_lock(tsk) do { \ | |
| 14 | if (unlikely((tsk)->lock_depth >= 0)) \ | |
| 15 | __release_kernel_lock(); \ | |
| 16 | } while (0) | |
| 17 | ||
| 1da177e4 LT |
18 | static inline int reacquire_kernel_lock(struct task_struct *task) |
| 19 | { | |
| 20 | if (unlikely(task->lock_depth >= 0)) | |
| 6478d880 | 21 | return __reacquire_kernel_lock(); |
| 1da177e4 LT |
22 | return 0; |
| 23 | } | |
| 24 | ||
| 925936eb FW |
25 | extern void __lockfunc |
| 26 | _lock_kernel(const char *func, const char *file, int line) | |
| 27 | __acquires(kernel_lock); | |
| 96a2c464 | 28 | |
| 925936eb FW |
29 | extern void __lockfunc |
| 30 | _unlock_kernel(const char *func, const char *file, int line) | |
| 31 | __releases(kernel_lock); | |
| 96a2c464 | 32 | |
| 925936eb FW |
33 | #define lock_kernel() do { \ |
| 34 | _lock_kernel(__func__, __FILE__, __LINE__); \ | |
| 35 | } while (0) | |
| 36 | ||
| 37 | #define unlock_kernel() do { \ | |
| 38 | _unlock_kernel(__func__, __FILE__, __LINE__); \ | |
| 39 | } while (0) | |
| 1da177e4 | 40 | |
| 0b280676 JC |
41 | /* |
| 42 | * Various legacy drivers don't really need the BKL in a specific | |
| 43 | * function, but they *do* need to know that the BKL became available. | |
| 44 | * This function just avoids wrapping a bunch of lock/unlock pairs | |
| 45 | * around code which doesn't really need it. | |
| 46 | */ | |
| 47 | static inline void cycle_kernel_lock(void) | |
| 48 | { | |
| 49 | lock_kernel(); | |
| 50 | unlock_kernel(); | |
| 51 | } | |
| 52 | ||
| 1da177e4 LT |
53 | #else |
| 54 | ||
| 6de5bd12 | 55 | #ifdef CONFIG_BKL /* provoke build bug if not set */ |
| 925936eb FW |
56 | #define lock_kernel() |
| 57 | #define unlock_kernel() | |
| 0b280676 | 58 | #define cycle_kernel_lock() do { } while(0) |
| 6de5bd12 AB |
59 | #endif /* CONFIG_BKL */ |
| 60 | ||
| 61 | #define release_kernel_lock(task) do { } while(0) | |
| 62 | #define reacquire_kernel_lock(task) 0 | |
| 1da177e4 LT |
63 | |
| 64 | #endif /* CONFIG_LOCK_KERNEL */ | |
| 65 | #endif /* __LINUX_SMPLOCK_H */ |