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gerrit-public.fairphone.software / kernel / msm-4.19 / 9390ef0c85fd065f01045fef708b046c98cda04c / . / include / linux / percpu-rwsem.h
blob: d2146a4f833e5819c56ba16afefe01687a3981fc [file] [log] [blame]
Mikulas Patocka62ac6652012-09-26 07:46:43 +0200[diff] [blame]1#ifndef _LINUX_PERCPU_RWSEM_H
2#define _LINUX_PERCPU_RWSEM_H
3
Oleg Nesterov9390ef02012-12-17 16:01:36 -0800[diff] [blame^]4#include <linux/atomic.h>
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]5#include <linux/rwsem.h>
Mikulas Patocka62ac6652012-09-26 07:46:43 +0200[diff] [blame]6#include <linux/percpu.h>
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]7#include <linux/wait.h>
Mikulas Patocka62ac6652012-09-26 07:46:43 +0200[diff] [blame]8
9struct percpu_rw_semaphore {
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]10 unsigned int __percpu *fast_read_ctr;
Oleg Nesterov9390ef02012-12-17 16:01:36 -0800[diff] [blame^]11 atomic_t write_ctr;
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]12 struct rw_semaphore rw_sem;
13 atomic_t slow_read_ctr;
14 wait_queue_head_t write_waitq;
Mikulas Patocka62ac6652012-09-26 07:46:43 +0200[diff] [blame]15};
16
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]17extern void percpu_down_read(struct percpu_rw_semaphore *);
18extern void percpu_up_read(struct percpu_rw_semaphore *);
Mikulas Patocka5c1eabe2012-10-22 19:37:47 -0400[diff] [blame]19
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]20extern void percpu_down_write(struct percpu_rw_semaphore *);
21extern void percpu_up_write(struct percpu_rw_semaphore *);
Mikulas Patocka62ac6652012-09-26 07:46:43 +0200[diff] [blame]22
Oleg Nesterova1fd3e22012-12-17 16:01:32 -0800[diff] [blame]23extern int percpu_init_rwsem(struct percpu_rw_semaphore *);
24extern void percpu_free_rwsem(struct percpu_rw_semaphore *);
Mikulas Patocka62ac6652012-09-26 07:46:43 +0200[diff] [blame]25
26#endif