Edit File: percpu-rwsem.h
#ifndef _LINUX_PERCPU_RWSEM_H #define _LINUX_PERCPU_RWSEM_H #include <linux/atomic.h> #include <linux/rwsem.h> #include <linux/percpu.h> #include <linux/wait.h> #include <linux/lockdep.h> struct percpu_rw_semaphore { unsigned int __percpu *fast_read_ctr; atomic_t write_ctr; struct rw_semaphore rw_sem; atomic_t slow_read_ctr; wait_queue_head_t write_waitq; }; extern void percpu_down_read(struct percpu_rw_semaphore *); extern void percpu_up_read(struct percpu_rw_semaphore *); extern void percpu_down_write(struct percpu_rw_semaphore *); extern void percpu_up_write(struct percpu_rw_semaphore *); extern int __percpu_init_rwsem(struct percpu_rw_semaphore *, const char *, struct lock_class_key *); extern void percpu_free_rwsem(struct percpu_rw_semaphore *); #define percpu_init_rwsem(brw) \ ({ \ static struct lock_class_key rwsem_key; \ __percpu_init_rwsem(brw, #brw, &rwsem_key); \ }) #endif