[PATCH 5/6] kvfree_rcu: clear KRC_MONITOR_TODO bit once a batch is started

[Uladzislau Rezki (Sony)]

Before attempting of starting a new batch the KRC_MONITOR_TODO
bit is cleared and set back when a previous RCU batch is still
in progress.

Clear the KRC_MONITOR_TODO bit only when a new batch has been
successfully queued, if not, it stays active anyway, thus no
reason in setting it back. Please note that checking/setting
this bit is protected by the krcp->lock spinlock.

Signed-off-by: Uladzislau Rezki (Sony) <ure...@gmail.com>
---
 kernel/rcu/tree.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index da3605067cc1..012030cbe55e 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3427,16 +3427,14 @@ static inline void kfree_rcu_drain_unlock(struct 
kfree_rcu_cpu *krcp,
                                          unsigned long flags)
 {
        // Attempt to start a new batch.
-       clear_bit(KRC_MONITOR_TODO, &krcp->flags);
-
        if (queue_kfree_rcu_work(krcp)) {
                // Success! Our job is done here.
+               clear_bit(KRC_MONITOR_TODO, &krcp->flags);
                raw_spin_unlock_irqrestore(&krcp->lock, flags);
                return;
        }
 
        // Previous RCU batch still in progress, try again later.
-       set_bit(KRC_MONITOR_TODO, &krcp->flags);
        schedule_delayed_work(&krcp->monitor_work, KFREE_DRAIN_JIFFIES);
        raw_spin_unlock_irqrestore(&krcp->lock, flags);
 }
-- 
2.20.1