Frederic Weisbecker 5c83cedbaa
rcu/nocb: Protect lazy shrinker against concurrent (de-)offloading ...
The shrinker may run concurrently with callbacks (de-)offloading. As
such, calling rcu_nocb_lock() is very dangerous because it does a
conditional locking. The worst outcome is that rcu_nocb_lock() doesn't
lock but rcu_nocb_unlock() eventually unlocks, or the reverse, creating
an imbalance.
Fix this with protecting against (de-)offloading using the barrier mutex.
Although if the barrier mutex is contended, which should be rare, then
step aside so as not to trigger a mutex VS allocation
dependency chain.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org >
Signed-off-by: Paul E. McKenney <paulmck@kernel.org >
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5c83cedbaa