rcu: Don't spawn rcub kthreads on root rcu_node structure

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Now that offlining CPUs no longer moves leaf rcu_node structures'
->blkd_tasks lists to the root, there is no way for the root rcu_node
structure's ->blkd_task list to be nonempty, unless the root node is also
the sole leaf node.  This commit therefore refrains from creating an rcub
kthread for the root rcu_node structure unless it is also the sole leaf.

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

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Paul E. McKenney 2014-11-03 18:15:17 -08:00

parent 96e92021d4

commit 3e9f5c70d8

1 changed files with 2 additions and 6 deletions

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kernel/rcu/tree_plugin.h

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