From eac07cd92c6ed9b0e4d03e071a4916d43fb2997a Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 14 Mar 2019 23:05:36 -0600
Subject: global: the _bh variety of rcu helpers have been unified

---
 src/compat/compat.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'src/compat')

diff --git a/src/compat/compat.h b/src/compat/compat.h
index 2dcdbae..396a293 100644
--- a/src/compat/compat.h
+++ b/src/compat/compat.h
@@ -778,6 +778,39 @@ struct __kernel_timespec {
 #define skb_probe_transport_header(a) skb_probe_transport_header(a, 0)
 #endif
 
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
+/* Note that all intentional uses of the non-_bh variety need to explicitly
+ * undef these, conditionalized on COMPAT_CANNOT_DEPRECIATE_BH_RCU.
+ */
+#include <linux/rcupdate.h>
+static __always_inline void old_synchronize_rcu(void)
+{
+	synchronize_rcu();
+}
+static __always_inline void old_call_rcu(void *a, void *b)
+{
+	call_rcu(a, b);
+}
+static __always_inline void old_rcu_barrier(void)
+{
+	rcu_barrier();
+}
+#ifdef synchronize_rcu
+#undef synchronize_rcu
+#endif
+#ifdef call_rcu
+#undef call_rcu
+#endif
+#ifdef rcu_barrier
+#undef rcu_barrier
+#endif
+#define synchronize_rcu synchronize_rcu_bh
+#define call_rcu call_rcu_bh
+#define rcu_barrier rcu_barrier_bh
+#define COMPAT_CANNOT_DEPRECIATE_BH_RCU
+#endif
+
 /* https://github.com/ClangBuiltLinux/linux/issues/7 */
 #if defined( __clang__) && (!defined(CONFIG_CLANG_VERSION) || CONFIG_CLANG_VERSION < 80000)
 #include <linux/bug.h>
-- 
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