rcu: Add ACCESS_ONCE() to ->qlen accesses

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The _rcu_barrier() function accesses other CPUs' rcu_data structure's
->qlen field without benefit of locking.  This commit therefore adds
the required ACCESS_ONCE() wrappers around accesses and updates that
need it.

ACCESS_ONCE() is not needed when a CPU accesses its own ->qlen, or
in code that cannot run while _rcu_barrier() is sampling ->qlen fields.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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Paul E. McKenney 2012-05-09 15:44:42 -07:00 • committed by Paul E. McKenney

parent 3f5d3ea64f

commit 1d1fb395f6

1 changed files with 4 additions and 4 deletions

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kernel/rcutree.c

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