From: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
[Activate on < 4.20 only]
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
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 b96ef496..cec4b3e8 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(4,20,0)
+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 /* < 4.20 */
+
#endif /* __BACKPORT_LINUX_RCUPDATE_H */
--
2.20.1
--
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