rcu: Make simple callback acceleration refer to rdp->gp_seq_needed

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Now that the rcu_data structure contains ->gp_seq_needed, create an
rcu_accelerate_cbs_unlocked() helper function that locklessly checks to
see if new callbacks' required grace period has already been requested.
If so, update the callback list locally and again locklessly.  (Though
interrupts must be and are disabled to avoid racing with conflicting
updates in interrupt handlers.)

Otherwise, call rcu_accelerate_cbs() as before.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Paul E. McKenney 2018-05-01 16:29:47 -07:00

parent ff3bb6f4d0

commit e44e73ca47

1 changed files with 32 additions and 19 deletions

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kernel/rcu/tree.c

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