diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2023-08-15 15:46:32 -0700 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2023-09-11 22:10:47 +0200 |
| commit | 5b404fdabacf4bee92d8c66013402a85f18a6a10 (patch) | |
| tree | 0dea17abbdfb376809a7c73d433697c9d63b346c /include/linux/rcu_notifier.h | |
| parent | 243d5ab34446854ceca55146fc0d837655657f8e (diff) | |
rcu: Add RCU CPU stall notifier
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>
Diffstat (limited to 'include/linux/rcu_notifier.h')
| -rw-r--r-- | include/linux/rcu_notifier.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/rcu_notifier.h b/include/linux/rcu_notifier.h new file mode 100644 index 000000000000..ebf371364581 --- /dev/null +++ b/include/linux/rcu_notifier.h @@ -0,0 +1,32 @@ +/* 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 + +#ifdef CONFIG_RCU_STALL_COMMON + +#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 // #ifdef CONFIG_RCU_STALL_COMMON + +// 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 // #ifdef CONFIG_RCU_STALL_COMMON + +#endif /* __LINUX_RCU_NOTIFIER_H */ |