[PATCH 0/4 v2] rcu/nocb: Shrinker related boring fixes

[Frederic Weisbecker]

Changes since v1 (https://lore.kernel.org/lkml/20230322194456.2331527-1-frederic@xxxxxxxxxx/):

* Use mutex_trylock() to avoid inverted dependency chain against
  allocations.

* WARN if an rdp is part of nocb mask but is not offloaded

Tested through shrinker debugfs interface.

Frederic Weisbecker (4):
  rcu/nocb: Protect lazy shrinker against concurrent (de-)offloading
  rcu/nocb: Fix shrinker race against callback enqueuer
  rcu/nocb: Recheck lazy callbacks under the ->nocb_lock from shrinker
  rcu/nocb: Make shrinker to iterate only NOCB CPUs

 kernel/rcu/tree_nocb.h | 52 ++++++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 5 deletions(-)

-- 
2.34.1