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It is sometimes helpful to have a way for the subsystem causing the stall to dump its state when an RCU CPU stall occurs. This commit therefore bases rcu_stall_chain_notifier_register() and rcu_stall_chain_notifier_unregister() on atomic notifiers in order to provide this functionality. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
33 lines
969 B
C
33 lines
969 B
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Read-Copy Update notifiers, initially RCU CPU stall notifier.
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* Separate from rcupdate.h to avoid #include loops.
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*
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* Copyright (C) 2023 Paul E. McKenney.
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*/
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#ifndef __LINUX_RCU_NOTIFIER_H
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#define __LINUX_RCU_NOTIFIER_H
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// Actions for RCU CPU stall notifier calls.
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#define RCU_STALL_NOTIFY_NORM 1
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#define RCU_STALL_NOTIFY_EXP 2
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#ifdef CONFIG_RCU_STALL_COMMON
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#include <linux/notifier.h>
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#include <linux/types.h>
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int rcu_stall_chain_notifier_register(struct notifier_block *n);
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int rcu_stall_chain_notifier_unregister(struct notifier_block *n);
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#else // #ifdef CONFIG_RCU_STALL_COMMON
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// No RCU CPU stall warnings in Tiny RCU.
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static inline int rcu_stall_chain_notifier_register(struct notifier_block *n) { return -EEXIST; }
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static inline int rcu_stall_chain_notifier_unregister(struct notifier_block *n) { return -ENOENT; }
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#endif // #else // #ifdef CONFIG_RCU_STALL_COMMON
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#endif /* __LINUX_RCU_NOTIFIER_H */
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