rcu: Better hotplug handling for synchronize_sched_expedited()

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Earlier versions of synchronize_sched_expedited() can prematurely end
grace periods due to the fact that a CPU marked as cpu_is_offline()
can still be using RCU read-side critical sections during the time that
CPU makes its last pass through the scheduler and into the idle loop
and during the time that a given CPU is in the process of coming online.
This commit therefore eliminates this window by adding additional
interaction with the CPU-hotplug operations.

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

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Paul E. McKenney 2015-09-03 00:45:02 -07:00

parent b08517c76d

commit 338b0f760e

1 changed files with 62 additions and 6 deletions

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kernel/rcu/tree.c

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