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Message-Id: <20211202001904.3126929-4-paulmck@kernel.org>
Date: Wed, 1 Dec 2021 16:19:04 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
jiangshanlai@...il.com, akpm@...ux-foundation.org,
mathieu.desnoyers@...icios.com, josh@...htriplett.org,
tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
oleg@...hat.com, joel@...lfernandes.org,
"Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 4/4] 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: Paul E. McKenney <paulmck@...nel.org>
---
kernel/rcu/tree.c | 18 ++++++++++++++++++
kernel/rcu/tree_plugin.h | 16 ----------------
2 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 5e98257c2910e..4ac019e9b25ff 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -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
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 19f7d578cedb3..0575757a0f8fc 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -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?
--
2.31.1.189.g2e36527f23
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