rcu: permit rcu_read_unlock() to be called while holding runqueue locks

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Avoid calling into the scheduler while holding core RCU locks.  This
allows rcu_read_unlock() to be called while holding the runqueue locks,
but only as long as there was no chance of the RCU read-side critical
section having been preempted.  (Otherwise, if RCU priority boosting
is enabled, rcu_read_unlock() might call into the scheduler in order to
unboost itself, which might allows self-deadlock on the runqueue locks
within the scheduler.)

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

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Paul E. McKenney 2011-05-04 21:43:49 -07:00 • committed by Paul E. McKenney

parent 29ce831000

commit 1217ed1ba5

3 changed files with 34 additions and 79 deletions

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40

kernel/rcutree.c

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5

kernel/rcutree.h

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64

kernel/rcutree_plugin.h

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