1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * Read-Copy Update notifiers, initially RCU CPU stall notifier. 4 * Separate from rcupdate.h to avoid #include loops. 5 * 6 * Copyright (C) 2023 Paul E. McKenney. 7 */ 8 9#ifndef __LINUX_RCU_NOTIFIER_H 10#define __LINUX_RCU_NOTIFIER_H 11 12// Actions for RCU CPU stall notifier calls. 13#define RCU_STALL_NOTIFY_NORM 1 14#define RCU_STALL_NOTIFY_EXP 2 15 16#if defined(CONFIG_RCU_STALL_COMMON) && defined(CONFIG_RCU_CPU_STALL_NOTIFIER) 17 18#include <linux/notifier.h> 19#include <linux/types.h> 20 21int rcu_stall_chain_notifier_register(struct notifier_block *n); 22int rcu_stall_chain_notifier_unregister(struct notifier_block *n); 23 24#else // #if defined(CONFIG_RCU_STALL_COMMON) && defined(CONFIG_RCU_CPU_STALL_NOTIFIER) 25 26// No RCU CPU stall warnings in Tiny RCU. 27static inline int rcu_stall_chain_notifier_register(struct notifier_block *n) { return -EEXIST; } 28static inline int rcu_stall_chain_notifier_unregister(struct notifier_block *n) { return -ENOENT; } 29 30#endif // #else // #if defined(CONFIG_RCU_STALL_COMMON) && defined(CONFIG_RCU_CPU_STALL_NOTIFIER) 31 32#endif /* __LINUX_RCU_NOTIFIER_H */ 33