From c1a340b484eab81a4b9a81d6007f690661b5e3da Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Sun, 24 Nov 2019 04:49:58 +0000
Subject: [PATCH] scst: Fix the build against kernel v5.0 and before

Fixes: ef161f930f46 ("scst: Rework handling of recursive locking")
Reported-by: Ville Skytta <ville.skytta@iki.fi>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8669 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scst/include/backport.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/scst/include/backport.h b/scst/include/backport.h
index 6df7ca081..fca5f414e 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -839,6 +839,20 @@ static inline bool list_entry_in_list(const struct list_head *entry)
 #define lockdep_assert_held(l) (void)(l)
 #endif
 
+/*
+ * See also commit 108c14858b9e ("locking/lockdep: Add support for dynamic
+ * keys").
+ */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
+static inline void lockdep_register_key(struct lock_class_key *key)
+{
+}
+
+static inline void lockdep_unregister_key(struct lock_class_key *key)
+{
+}
+#endif
+
 /* <linux/mempoool.h> */
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 /*