Commit bc849e91 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Move rcu_needs_cpu() to tree.c 



Now that RCU_FAST_NO_HZ is no more, there is but one implementation of
the rcu_needs_cpu() function.  This commit therefore moves this function
from kernel/rcu/tree_plugin.c to kernel/rcu/tree.c.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent e2c73a68

kernel/rcu/tree.c

+18 −0
Original line number Diff line number Diff line
@@ -1075,6 +1075,24 @@ void rcu_irq_enter_irqson(void) 
	local_irq_restore(flags);

}



/*

 * Check to see if any future non-offloaded RCU-related work will need

 * to be done by the current CPU, even if none need be done immediately,

 * returning 1 if so.  This function is part of the RCU implementation;

 * it is -not- an exported member of the RCU API.  This is used by

 * the idle-entry code to figure out whether it is safe to disable the

 * scheduler-clock interrupt.

 *

 * Just check whether or not this CPU has non-offloaded RCU callbacks

 * queued.

 */

int rcu_needs_cpu(u64 basemono, u64 *nextevt)

{

	*nextevt = KTIME_MAX;

	return !rcu_segcblist_empty(&this_cpu_ptr(&rcu_data)->cblist) &&

		!rcu_rdp_is_offloaded(this_cpu_ptr(&rcu_data));

}



/*

 * If any sort of urgency was applied to the current CPU (for example,

 * the scheduler-clock interrupt was enabled on a nohz_full CPU) in order

kernel/rcu/tree_plugin.h

+0 −16
Original line number Diff line number Diff line
@@ -1251,22 +1251,6 @@ static void __init rcu_spawn_boost_kthreads(void) 


#endif /* #else #ifdef CONFIG_RCU_BOOST */



/*

 * Check to see if any future non-offloaded RCU-related work will need

 * to be done by the current CPU, even if none need be done immediately,

 * returning 1 if so.  This function is part of the RCU implementation;

 * it is -not- an exported member of the RCU API.

 *

 * Just check whether or not this CPU has non-offloaded RCU callbacks

 * queued.

 */

int rcu_needs_cpu(u64 basemono, u64 *nextevt)

{

	*nextevt = KTIME_MAX;

	return !rcu_segcblist_empty(&this_cpu_ptr(&rcu_data)->cblist) &&

		!rcu_rdp_is_offloaded(this_cpu_ptr(&rcu_data));

}



/*

 * Is this CPU a NO_HZ_FULL CPU that should ignore RCU so that the

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