Merge branches 'fixes.2024.04.15a', 'misc.2024.04.12a', 'rcu-sync-normal-improve.2024.04.15a', 'rcu-tasks.2024.04.15a' and 'rcutorture.2024.04.15a' into rcu-merge.2024.04.15a

fixes.2024.04.15a: RCU fixes
misc.2024.04.12a: Miscellaneous fixes
rcu-sync-normal-improve.2024.04.15a: Improving synchronize_rcu() call
rcu-tasks.2024.04.15a: Tasks RCU updates
rcutorture.2024.04.15a: Torture-test updates