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docs: Update RCU's hotplug requirements with a bit about design
The rcu_barrier() section of the "Hotplug CPU" section discusses deadlocks, however the description of deadlocks other than those involving rcu_barrier() is rather incomplete. This commit therefore continues the section by describing how RCU's design handles CPU hotplug in a deadlock-free way. Signed-off-by: Joel Fernandes (Google) <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]>
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