rcu: Rework rcu_barrier() and callback-migration logic

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This commit reworks rcu_barrier() and callback-migration logic to
permit allowing rcu_barrier() to run concurrently with CPU-hotplug
operations.  The key trick is for callback migration to check to see if
an rcu_barrier() is in flight, and, if so, enqueue the ->barrier_head
callback on its behalf.

This commit adds synchronization with RCU's CPU-hotplug notifiers.  Taken
together, this will permit a later commit to remove the cpus_read_lock()
and cpus_read_unlock() calls from rcu_barrier().

[ paulmck: Updated per kbuild test robot feedback. ]
[ paulmck: Updated per reviews session with Neeraj, Frederic, Uladzislau, and Boqun. ]

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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This commit is contained in:

Paul E. McKenney 2021-12-14 13:15:18 -08:00

parent 0cabb47af3

commit a16578dd5e

2 changed files with 63 additions and 16 deletions

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77

kernel/rcu/tree.c

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2

kernel/rcu/tree.h

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