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rcu: Remove unused rcu_kick_nohz_cpu() function

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The rcu_kick_nohz_cpu() function is no longer used, and the functionality
it used to provide is now provided by a call to resched_cpu() in the
force-quiescent-state function rcu_implicit_dynticks_qs().  This commit
therefore removes rcu_kick_nohz_cpu().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-05-16 20:41:36 -07:00
parent c7037ff524
commit 164ba3fc48
2 changed files with 0 additions and 18 deletions
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1
kernel/rcu/tree.h
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@ -483,7 +483,6 @@ static void __init rcu_spawn_nocb_kthreads(void);
#ifdef CONFIG_RCU_NOCB_CPU #ifdef CONFIG_RCU_NOCB_CPU
static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp); static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp);
#endif /* #ifdef CONFIG_RCU_NOCB_CPU */ #endif /* #ifdef CONFIG_RCU_NOCB_CPU */
static void __maybe_unused rcu_kick_nohz_cpu(int cpu);
static bool init_nocb_callback_list(struct rcu_data *rdp); static bool init_nocb_callback_list(struct rcu_data *rdp);
static void rcu_bind_gp_kthread(void); static void rcu_bind_gp_kthread(void);
static bool rcu_nohz_full_cpu(struct rcu_state *rsp); static bool rcu_nohz_full_cpu(struct rcu_state *rsp);

17
kernel/rcu/tree_plugin.h
View file

@ -2645,23 +2645,6 @@ static bool init_nocb_callback_list(struct rcu_data *rdp)
#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */ #endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */
/*
* An adaptive-ticks CPU can potentially execute in kernel mode for an
* arbitrarily long period of time with the scheduling-clock tick turned
* off. RCU will be paying attention to this CPU because it is in the
* kernel, but the CPU cannot be guaranteed to be executing the RCU state
* machine because the scheduling-clock tick has been disabled. Therefore,
* if an adaptive-ticks CPU is failing to respond to the current grace
* period and has not be idle from an RCU perspective, kick it.
*/
static void __maybe_unused rcu_kick_nohz_cpu(int cpu)
{
#ifdef CONFIG_NO_HZ_FULL
if (tick_nohz_full_cpu(cpu))
smp_send_reschedule(cpu);
#endif /* #ifdef CONFIG_NO_HZ_FULL */
}
/* /*
* Is this CPU a NO_HZ_FULL CPU that should ignore RCU so that the * Is this CPU a NO_HZ_FULL CPU that should ignore RCU so that the
* grace-period kthread will do force_quiescent_state() processing? * grace-period kthread will do force_quiescent_state() processing?