rcu/nocb: Never downgrade ->nocb_defer_wakeup in wake_nocb_gp_defer()

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Currently, wake_nocb_gp_defer() simply stores whatever waketype was
passed in, which can result in a RCU_NOCB_WAKE_FORCE being downgraded
to RCU_NOCB_WAKE, which could in turn delay callback processing.
This commit therefore adds a check so that wake_nocb_gp_defer() only
updates ->nocb_defer_wakeup when the update increases the forcefulness,
thus avoiding downgrades.

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

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Paul E. McKenney 2019-05-23 13:49:26 -07:00

parent aeeacd9d84

commit 383e133283

1 changed files with 2 additions and 1 deletions

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kernel/rcu/tree_plugin.h

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