v3: If smp_mb__after_unlock_lock() is in barrier.h, then
for arm64, kernel/rcu/tree.c doesn't compile because barrier.h
is not included in kernel/rcu/tree.c
(v2 was: add example from Paul, something that can happen on real HW)
spin_unlock() + spin_lock() together do not form a full memory
v3: If smp_mb__after_unlock_lock() is in barrier.h, then
for arm64, kernel/rcu/tree.c doesn't compile because barrier.h
is not included in kernel/rcu/tree.c
(v2 was: add example from Paul, something that can happen on real HW)
spin_unlock() + spin_lock() together do not form a full memory
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