From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/linux/percpu-rwsem.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 kernel/include/linux/percpu-rwsem.h (limited to 'kernel/include/linux/percpu-rwsem.h') diff --git a/kernel/include/linux/percpu-rwsem.h b/kernel/include/linux/percpu-rwsem.h new file mode 100644 index 000000000..3e88c9a7d --- /dev/null +++ b/kernel/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 1.2.3-korg