fs/locks.c: Remove stale FIXME left over from BKL conversion
[linux-2.6.git] / include / linux / smp_lock.h
1 #ifndef __LINUX_SMPLOCK_H
2 #define __LINUX_SMPLOCK_H
3
4 #ifdef CONFIG_LOCK_KERNEL
5 #include <linux/sched.h>
6
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
18 static inline int reacquire_kernel_lock(struct task_struct *task)
19 {
20         if (unlikely(task->lock_depth >= 0))
21                 return __reacquire_kernel_lock();
22         return 0;
23 }
24
25 extern void __lockfunc
26 _lock_kernel(const char *func, const char *file, int line)
27 __acquires(kernel_lock);
28
29 extern void __lockfunc
30 _unlock_kernel(const char *func, const char *file, int line)
31 __releases(kernel_lock);
32
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)
40
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
53 #else
54
55 #ifdef CONFIG_BKL /* provoke build bug if not set */
56 #define lock_kernel()
57 #define unlock_kernel()
58 #define cycle_kernel_lock()                     do { } while(0)
59 #endif /* CONFIG_BKL */
60
61 #define release_kernel_lock(task)               do { } while(0)
62 #define reacquire_kernel_lock(task)             0
63
64 #endif /* CONFIG_LOCK_KERNEL */
65 #endif /* __LINUX_SMPLOCK_H */