diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2021-12-09 02:41:53 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-02-14 21:36:35 +0300 |
| commit | 218b957a6959a2fb5b3967fc824072bb89ac2611 (patch) | |
| tree | 1988ba8a0ff2a7169f8f210f16d2ede069fe363d /kernel/rcu/tree.h | |
| parent | 150154aae4311e7e6458903baecdc8fffe981ed3 (diff) | |
| download | linux-218b957a6959a2fb5b3967fc824072bb89ac2611.tar.xz | |
rcu: Add mutex for rcu boost kthread spawning and affinity setting
As we handle parallel CPU bringup, we will need to take care to avoid
spawning multiple boost threads, or race conditions when setting their
affinity. Spotted by Paul McKenney.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 486fc901bd08..3b8b60de07c3 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -110,6 +110,9 @@ struct rcu_node { /* side effect, not as a lock. */ unsigned long boost_time; /* When to start boosting (jiffies). */ + struct mutex boost_kthread_mutex; + /* Exclusion for thread spawning and affinity */ + /* manipulation. */ struct task_struct *boost_kthread_task; /* kthread that takes care of priority */ /* boosting for this rcu_node structure. */ |