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List: linux-backports
Subject: [PATCH 3/3] backport: rcupdate: add rcu_head_init and rcu_head_after_call_rcu
From: Arend van Spriel <arend.vanspriel () broadcom ! com>
Date: 2019-03-31 21:12:42
Message-ID: 1554066762-20128-3-git-send-email-arend.vanspriel () broadcom ! com
[Download RAW message or body]
Include static inline functions that were added by commit
74de6960c99d ("rcu: Provide functions for determining if call_rcu()
has been invoked").
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
---
backport/backport-include/linux/rcupdate.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/backport/backport-include/linux/rcupdate.h b/backport/backport-include/linux/rcupdate.h
index b96ef49..8b9c94e 100644
--- a/backport/backport-include/linux/rcupdate.h
+++ b/backport/backport-include/linux/rcupdate.h
@@ -41,4 +41,22 @@
#define rcu_dereference_raw(p) rcu_dereference(p)
#endif
+#if LINUX_VERSION_IS_LESS(5,2,0)
+typedef void (*rcu_callback_t)(struct rcu_head *head);
+
+static inline void rcu_head_init(struct rcu_head *rhp)
+{
+ rhp->func = (rcu_callback_t)~0L;
+}
+
+static inline bool
+rcu_head_after_call_rcu(struct rcu_head *rhp, rcu_callback_t f)
+{
+ if (READ_ONCE(rhp->func) == f)
+ return true;
+ WARN_ON_ONCE(READ_ONCE(rhp->func) != (rcu_callback_t)~0L);
+ return false;
+}
+#endif
+
#endif /* __BACKPORT_LINUX_RCUPDATE_H */
--
1.9.1
--
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