Pull RCU fix from Joel Fernandes:
"We recently got a report of a crash [1] with misuse of call_rcu().
Instead of crashing the kernel, a warning and graceful return is
better:
- rcu: Return early if callback is not specified (Uladzislau Rezki)"
Link: https://lore.kernel.org/all/aEnVuzK7VhGSizWj@pc636/
* tag 'rcu/fixes-for-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux:
rcu: Return early if callback is not specified