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rcu: Protect rcu_boost() lockless accesses with ACCESS_ONCE()

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This commit prevents random compiler optimizations by applying
ACCESS_ONCE() to lockless accesses.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2014-10-29 15:39:39 -07:00
parent 734d168013
commit b08ea27d95
1 changed files with 2 additions and 1 deletions
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3
kernel/rcu/tree_plugin.h
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@ -1127,7 +1127,8 @@ static int rcu_boost(struct rcu_node *rnp)
struct task_struct *t; struct task_struct *t;
struct list_head *tb; struct list_head *tb;
if (rnp->exp_tasks == NULL && rnp->boost_tasks == NULL) if (ACCESS_ONCE(rnp->exp_tasks) == NULL &&
ACCESS_ONCE(rnp->boost_tasks) == NULL)
return 0; /* Nothing left to boost. */ return 0; /* Nothing left to boost. */
raw_spin_lock_irqsave(&rnp->lock, flags); raw_spin_lock_irqsave(&rnp->lock, flags);