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rcu: Move rcu_needs_cpu() to tree.c

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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: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-09-27 14:30:20 -07:00
parent e2c73a6860
commit bc849e9192
2 changed files with 18 additions and 16 deletions
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18
kernel/rcu/tree.c
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@ -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

16
kernel/rcu/tree_plugin.h
View file

@ -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?