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Commit 164ba3fc authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Remove unused rcu_kick_nohz_cpu() function 



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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent c7037ff5

kernel/rcu/tree.h

+0 −1
Original line number Diff line number Diff line
@@ -483,7 +483,6 @@ static void __init rcu_spawn_nocb_kthreads(void); 
#ifdef CONFIG_RCU_NOCB_CPU

static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp);

#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 void rcu_bind_gp_kthread(void);

static bool rcu_nohz_full_cpu(struct rcu_state *rsp);

kernel/rcu/tree_plugin.h

+0 −17
Original line number Diff line number Diff line
@@ -2645,23 +2645,6 @@ static bool init_nocb_callback_list(struct rcu_data *rdp) 


#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

 * grace-period kthread will do force_quiescent_state() processing?