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| author |   Frederic Weisbecker <frederic@kernel.org> | 2021-02-23 01:10:07 +0100 |
|---|---|---|
| committer |   Paul E. McKenney <paulmck@kernel.org> | 2021-05-12 12:10:23 -0700 |
| commit | b6e2c4ed35c33d7e55197aa26d99645a690ca467 (patch) | |
| tree | 8fad2f4acaa1862849859b1a5c5c6128ad509ad9 /kernel/rcu | |
| parent | rcu/nocb: Allow de-offloading rdp leader (diff) | |
| download | linux-dev-b6e2c4ed35c33d7e55197aa26d99645a690ca467.tar.xz linux-dev-b6e2c4ed35c33d7e55197aa26d99645a690ca467.zip | |
rcu/nocb: Cancel nocb_timer upon nocb_gp wakeup
When waking up in nocb_gp_wait(), there is no need to keep the nocb_timer
around because this function will traverse the whole rdp list. Any
update performed before the timer was armed will now be visible after
the ->nocb_gp_lock acquire.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 015adec5bdc5..a667551a5501 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2211,6 +2211,10 @@ static void nocb_gp_wait(struct rcu_data *my_rdp) raw_spin_lock_irqsave(&my_rdp->nocb_gp_lock, flags); if (bypass) del_timer(&my_rdp->nocb_bypass_timer); + if (my_rdp->nocb_defer_wakeup > RCU_NOCB_WAKE_NOT) { + WRITE_ONCE(my_rdp->nocb_defer_wakeup, RCU_NOCB_WAKE_NOT); + del_timer(&my_rdp->nocb_timer); + } WRITE_ONCE(my_rdp->nocb_gp_sleep, true); raw_spin_unlock_irqrestore(&my_rdp->nocb_gp_lock, flags); } |