rcu: Rework preemptible expedited bitmask handling

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Currently, the rcu_node tree ->expmask bitmasks are initially set to
reflect the online CPUs.  This is pointless, because only the CPUs
preempted within RCU read-side critical sections by the preceding
synchronize_sched_expedited() need to be tracked.  This commit therefore
instead sets up these bitmasks based on the state of the ->blkd_tasks
lists.

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

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Paul E. McKenney 2015-02-13 10:52:28 -08:00

parent 999c286347

commit 8eb74b2b29

1 changed files with 75 additions and 23 deletions

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kernel/rcu/tree_plugin.h

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