Commit | Line | Data |
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62ac665f MP |
1 | #ifndef _LINUX_PERCPU_RWSEM_H |
2 | #define _LINUX_PERCPU_RWSEM_H | |
3 | ||
9390ef0c | 4 | #include <linux/atomic.h> |
a1fd3e24 | 5 | #include <linux/rwsem.h> |
62ac665f | 6 | #include <linux/percpu.h> |
a1fd3e24 | 7 | #include <linux/wait.h> |
8ebe3473 | 8 | #include <linux/lockdep.h> |
62ac665f MP |
9 | |
10 | struct percpu_rw_semaphore { | |
a1fd3e24 | 11 | unsigned int __percpu *fast_read_ctr; |
9390ef0c | 12 | atomic_t write_ctr; |
a1fd3e24 ON |
13 | struct rw_semaphore rw_sem; |
14 | atomic_t slow_read_ctr; | |
15 | wait_queue_head_t write_waitq; | |
62ac665f MP |
16 | }; |
17 | ||
a1fd3e24 ON |
18 | extern void percpu_down_read(struct percpu_rw_semaphore *); |
19 | extern void percpu_up_read(struct percpu_rw_semaphore *); | |
5c1eabe6 | 20 | |
a1fd3e24 ON |
21 | extern void percpu_down_write(struct percpu_rw_semaphore *); |
22 | extern void percpu_up_write(struct percpu_rw_semaphore *); | |
62ac665f | 23 | |
8ebe3473 ON |
24 | extern int __percpu_init_rwsem(struct percpu_rw_semaphore *, |
25 | const char *, struct lock_class_key *); | |
a1fd3e24 | 26 | extern void percpu_free_rwsem(struct percpu_rw_semaphore *); |
62ac665f | 27 | |
8ebe3473 ON |
28 | #define percpu_init_rwsem(brw) \ |
29 | ({ \ | |
30 | static struct lock_class_key rwsem_key; \ | |
31 | __percpu_init_rwsem(brw, #brw, &rwsem_key); \ | |
32 | }) | |
33 | ||
62ac665f | 34 | #endif |