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authorFrederic Weisbecker <frederic@kernel.org>2020-11-13 13:13:19 +0100
committerPaul E. McKenney <paulmck@kernel.org>2021-01-06 16:24:19 -0800
commitd97b078182406c0bd0aacd36fc0a693e118e608f (patch)
tree88d524c2c60c23eaded9d879db8c2c034051247f /include/linux/rcupdate.h
parent126d9d49528dae792859e5f11f3b447ce8a9a9b4 (diff)
rcu/nocb: De-offloading CB kthread
To de-offload callback processing back onto a CPU, it is necessary to clear SEGCBLIST_OFFLOAD and notify the nocb CB kthread, which will then clear its own bit flag and go to sleep to stop handling callbacks. This commit makes that change. It will also be necessary to notify the nocb GP kthread in this same way, which is the subject of a follow-on commit. Cc: Josh Triplett <josh@joshtriplett.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Neeraj Upadhyay <neeraju@codeaurora.org> Cc: Thomas Gleixner <tglx@linutronix.de> Inspired-by: Paul E. McKenney <paulmck@kernel.org> Tested-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> [ paulmck: Add export per kernel test robot feedback. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index de0826411311..40266eb418b6 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -104,8 +104,10 @@ static inline void rcu_user_exit(void) { }
#ifdef CONFIG_RCU_NOCB_CPU
void rcu_init_nohz(void);
+int rcu_nocb_cpu_deoffload(int cpu);
#else /* #ifdef CONFIG_RCU_NOCB_CPU */
static inline void rcu_init_nohz(void) { }
+static inline int rcu_nocb_cpu_deoffload(int cpu) { return 0; }
#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */
/**