rcu_sync: Introduce rcu_sync_dtor()

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This commit allows rcu_sync structures to be safely deallocated,
The trick is to add a new ->wait field to the gp_ops array.
This field is a pointer to the rcu_barrier() function corresponding
to the flavor of RCU in question.  This allows a new rcu_sync_dtor()
to wait for any outstanding callbacks before freeing the rcu_sync
structure.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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Oleg Nesterov 2015-08-21 19:42:52 +02:00 • committed by Paul E. McKenney

parent 3a518b76af

commit 07899a6e5f

2 changed files with 27 additions and 0 deletions

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1

include/linux/rcu_sync.h

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26

kernel/rcu/sync.c

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