X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Finclude%2Flinux%2Fpercpu-rwsem.h;fp=kernel%2Finclude%2Flinux%2Fpercpu-rwsem.h;h=3e88c9a7d57f7fdaf5c1e8ee3194df6ae3677f13;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

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 <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