rcu: Check for NOCB CPUs and empty lists earlier in CB migration

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The current CPU-hotplug RCU-callback-migration code checks
for the source (newly offlined) CPU being a NOCBs CPU down in
rcu_send_cbs_to_orphanage().  This commit simplifies callback migration a
bit by moving this check up to rcu_migrate_callbacks().  This commit also
adds a check for the source CPU having no callbacks, which eases analysis
of the rcu_send_cbs_to_orphanage() and rcu_adopt_orphan_cbs() functions.

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

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Paul E. McKenney 2017-06-26 10:49:50 -07:00

parent c47e067a3c

commit 95335c0355

1 changed files with 3 additions and 4 deletions

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kernel/rcu/tree.c

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