/* SPDX-License-Identifier: GPL-2.0+ */ /* * Read-Copy Update notifiers, initially RCU CPU stall notifier. * Separate from rcupdate.h to avoid #include loops. * * Copyright (C) 2023 Paul E. McKenney. */ #ifndef __LINUX_RCU_NOTIFIER_H #define __LINUX_RCU_NOTIFIER_H // Actions for RCU CPU stall notifier calls. #define RCU_STALL_NOTIFY_NORM 1 #define RCU_STALL_NOTIFY_EXP 2 #if defined(CONFIG_RCU_STALL_COMMON) && defined(CONFIG_RCU_CPU_STALL_NOTIFIER) #include <linux/notifier.h> #include <linux/types.h> int rcu_stall_chain_notifier_register(struct notifier_block *n); int rcu_stall_chain_notifier_unregister(struct notifier_block *n); #else // #if defined(CONFIG_RCU_STALL_COMMON) && defined(CONFIG_RCU_CPU_STALL_NOTIFIER) // No RCU CPU stall warnings in Tiny RCU. static inline int rcu_stall_chain_notifier_register(struct notifier_block *n) { return -EEXIST; } static inline int rcu_stall_chain_notifier_unregister(struct notifier_block *n) { return -ENOENT; } #endif // #else // #if defined(CONFIG_RCU_STALL_COMMON) && defined(CONFIG_RCU_CPU_STALL_NOTIFIER) #endif /* __LINUX_RCU_NOTIFIER_H */