From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- include/linux/percpu-rwsem.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 include/linux/percpu-rwsem.h (limited to 'include/linux/percpu-rwsem.h') diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h new file mode 100644 index 00000000..3e88c9a7 --- /dev/null +++ b/include/linux/percpu-rwsem.h @@ -0,0 +1,34 @@ +#ifndef _LINUX_PERCPU_RWSEM_H +#define _LINUX_PERCPU_RWSEM_H + +#include +#include +#include +#include +#include + +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 -- cgit v1.3.1