rcu/nocb: Make rcutree_migrate_callbacks() start at leaf rcu_node structure

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Because rcutree_migrate_callbacks() is invoked infrequently and because
an exact snapshot of the grace-period state might save some callbacks a
second trip through a grace period, this function has used the root
rcu_node structure.  However, this safe-second-trip optimization
happens only if rcutree_migrate_callbacks() races with grace-period
initialization, so it is not worth the added mental load.  This commit
therefore makes rcutree_migrate_callbacks() start with the leaf rcu_node
structures, as is done elsewhere.

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

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This commit is contained in:

Paul E. McKenney 2019-04-16 14:09:15 -07:00

parent 750d7f6a43

commit c00045be32

1 changed files with 6 additions and 5 deletions

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kernel/rcu/tree.c

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