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Subject[tip: core/rcu] kvfree_rcu: Update "monitor_todo" once a batch is started
The following commit has been merged into the core/rcu branch of tip:

Commit-ID: dd28c9f057ad099f6221829053e48f331e6f0b7f
Author: Uladzislau Rezki (Sony) <>
AuthorDate: Thu, 15 Apr 2021 19:19:59 +02:00
Committer: Paul E. McKenney <>
CommitterDate: Mon, 10 May 2021 16:00:48 -07:00

kvfree_rcu: Update "monitor_todo" once a batch is started

Before attempting to start a new batch the "monitor_todo" variable is
set to "false" and set back to "true" when a previous RCU batch is still
in progress. This is at best confusing.

Thus change this variable to "false" only when a new batch has been
successfully queued, otherwise, just leave it be.

Signed-off-by: Uladzislau Rezki (Sony) <>
Signed-off-by: Paul E. McKenney <>
kernel/rcu/tree.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e86f32d..1ae5f88 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3442,15 +3442,14 @@ static inline void kfree_rcu_drain_unlock(struct kfree_rcu_cpu *krcp,
unsigned long flags)
// Attempt to start a new batch.
- krcp->monitor_todo = false;
if (queue_kfree_rcu_work(krcp)) {
// Success! Our job is done here.
+ krcp->monitor_todo = false;
raw_spin_unlock_irqrestore(&krcp->lock, flags);

// Previous RCU batch still in progress, try again later.
- krcp->monitor_todo = true;
schedule_delayed_work(&krcp->monitor_work, KFREE_DRAIN_JIFFIES);
raw_spin_unlock_irqrestore(&krcp->lock, flags);
 \ /
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