From 71394eaf9191a2f8944900d8a738c32cff3c2e5b Mon Sep 17 00:00:00 2001 From: Arend van Spriel Date: Sun, 31 Mar 2019 23:12:42 +0200 Subject: backport: rcupdate: add rcu_head_init and rcu_head_after_call_rcu 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 [Activate on < 4.20 only] Signed-off-by: Hauke Mehrtens --- 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 */ -- cgit v1.2.3