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> |
| 96a2c464 | 6 | #include <trace/events/bkl.h> |
| 1da177e4 | 7 | |
| 1da177e4 LT |
8 | #define kernel_locked() (current->lock_depth >= 0) |
| 9 | ||
| 10 | extern int __lockfunc __reacquire_kernel_lock(void); | |
| 11 | extern void __lockfunc __release_kernel_lock(void); | |
| 12 | ||
| 13 | /* | |
| 14 | * Release/re-acquire global kernel lock for the scheduler | |
| 15 | */ | |
| 16 | #define release_kernel_lock(tsk) do { \ | |
| 17 | if (unlikely((tsk)->lock_depth >= 0)) \ | |
| 18 | __release_kernel_lock(); \ | |
| 19 | } while (0) | |
| 20 | ||
| 1da177e4 LT |
21 | static inline int reacquire_kernel_lock(struct task_struct *task) |
| 22 | { | |
| 23 | if (unlikely(task->lock_depth >= 0)) | |
| 6478d880 | 24 | return __reacquire_kernel_lock(); |
| 1da177e4 LT |
25 | return 0; |
| 26 | } | |
| 27 | ||
| 96a2c464 FW |
28 | extern void __lockfunc _lock_kernel(void) __acquires(kernel_lock); |
| 29 | extern void __lockfunc _unlock_kernel(void) __releases(kernel_lock); | |
| 30 | ||
| 31 | #define lock_kernel() { \ | |
| 32 | trace_lock_kernel(__func__, __FILE__, __LINE__); \ | |
| 33 | _lock_kernel(); \ | |
| 34 | } | |
| 35 | ||
| 36 | #define unlock_kernel() { \ | |
| 37 | trace_unlock_kernel(__func__, __FILE__, __LINE__); \ | |
| 38 | _unlock_kernel(); \ | |
| 39 | } | |
| 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 | ||
| 96a2c464 FW |
55 | #define lock_kernel() trace_lock_kernel(__func__, __FILE__, __LINE__); |
| 56 | #define unlock_kernel() trace_unlock_kernel(__func__, __FILE__, __LINE__); | |
| 1da177e4 | 57 | #define release_kernel_lock(task) do { } while(0) |
| 0b280676 | 58 | #define cycle_kernel_lock() do { } while(0) |
| 1da177e4 LT |
59 | #define reacquire_kernel_lock(task) 0 |
| 60 | #define kernel_locked() 1 | |
| 61 | ||
| 62 | #endif /* CONFIG_LOCK_KERNEL */ | |
| 63 | #endif /* __LINUX_SMPLOCK_H */ |